Document:

<PAGE>
                                                                     EXHIBIT 4.4

                                RADIOLOGIX, INC.
                                   as Issuer,

                     THE SUBSIDIARY GUARANTORS NAMED HEREIN

                                  $160,000,000

                               10.5% Senior Notes
                              due December 15, 2008

                                   ----------

                                    INDENTURE

                          Dated as of December 12, 2001

                                   ----------

                                 U.S. BANK, N.A.

                                   as Trustee

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                                TABLE OF CONTENTS

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ARTICLE I

                       DEFINITIONS AND INCORPORATION BY REFERENCE...............................1
     SECTION 1.1.      DEFINITIONS..............................................................1
     SECTION 1.2.      INCORPORATION BY REFERENCE OF TIA.......................................27
     SECTION 1.3.      RULES OF CONSTRUCTION...................................................27

ARTICLE II

                       THE SECURITIES..........................................................28
     SECTION 2.1.      FORM AND DATING.........................................................28
     SECTION 2.2.      EXECUTION AND AUTHENTICATION............................................29
     SECTION 2.3.      REGISTRAR, PAYING AGENT AND DEPOSITARY..................................29
     SECTION 2.4.      PAYING AGENT TO HOLD MONEY IN TRUST.....................................30
     SECTION 2.5.      HOLDER LISTS............................................................30
     SECTION 2.6.      TRANSFER AND EXCHANGE...................................................30
     SECTION 2.7.      REPLACEMENT NOTES.......................................................47
     SECTION 2.8.      OUTSTANDING NOTES.......................................................47
     SECTION 2.9.      TREASURY NOTES..........................................................48
     SECTION 2.10.     TEMPORARY NOTES.........................................................48
     SECTION 2.11.     CANCELLATION............................................................48
     SECTION 2.12.     DEFAULTED INTEREST......................................................48
     SECTION 2.13.     CUSIP NUMBERS...........................................................49
     SECTION 2.14.     ISSUANCE OF ADDITIONAL NOTES............................................50

ARTICLE III

                       REDEMPTION..............................................................50
     SECTION 3.1.      OPTIONAL REDEMPTION.....................................................50
     SECTION 3.2.      NOTICES TO TRUSTEE......................................................51
     SECTION 3.3.      SELECTION OF NOTES TO BE REDEEMED.......................................51
     SECTION 3.4.      NOTICE OF REDEMPTION....................................................52
     SECTION 3.5.      EFFECT OF NOTICE OF REDEMPTION..........................................53
     SECTION 3.6.      DEPOSIT OF REDEMPTION PRICE.............................................53
     SECTION 3.7.      NOTES REDEEMED IN PART..................................................53
     SECTION 3.8.      NO MANDATORY REDEMPTION.................................................54

ARTICLE IV

                       COVENANTS...............................................................54
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     SECTION 4.1.      PAYMENT OF NOTES........................................................54
     SECTION 4.2.      MAINTENANCE OF OFFICE OR AGENCY.........................................54
     SECTION 4.3.      LIMITATION ON RESTRICTED PAYMENTS.......................................55
     SECTION 4.4.      CORPORATE AND PARTNERSHIP EXISTENCE.....................................57
     SECTION 4.5.      PAYMENT OF TAXES AND OTHER CLAIMS.......................................57
     SECTION 4.6.      MAINTENANCE OF PROPERTIES AND INSURANCE.................................58
     SECTION 4.7.      COMPLIANCE CERTIFICATE; NOTICE OF DEFAULT...............................58
     SECTION 4.8.      REPORTS.................................................................59
     SECTION 4.9.      LIMITATION ON STATUS AS INVESTMENT COMPANY..............................59
     SECTION 4.10.     LIMITATION ON TRANSACTIONS WITH AFFILIATES..............................59
     SECTION 4.11.     LIMITATION ON INCURRENCE OF ADDITIONAL INDEBTEDNESS.....................60
     SECTION 4.12.     LIMITATIONS ON DIVIDENDS AND OTHER PAYMENT RESTRICTIONS AFFECTING
                       SUBSIDIARIES............................................................62
     SECTION 4.13.     LIMITATIONS ON LAYERING INDEBTEDNESS....................................63
     SECTION 4.14.     LIMITATION ON SALES OF ASSETS AND SUBSIDIARY STOCK......................63
     SECTION 4.15.     WAIVER OF STAY, EXTENSION OR USURY LAWS.................................68
     SECTION 4.16.     LIMITATION ON LIENS SECURING INDEBTEDNESS...............................69
     SECTION 4.17.     LIMITATIONS ON LINES OF BUSINESS........................................69
     SECTION 4.18.     SALE AND LEASEBACK TRANSACTIONS.........................................69
     SECTION 4.19.     LIMITATION ON CASH INTEREST PAYMENTS ON CONVERTIBLE NOTE................70
     SECTION 4.20.     DESIGNATION OF UNRESTRICTED SUBSIDIARIES................................70

ARTICLE V

                       SUCCESSOR CORPORATION...................................................71
     SECTION 5.1.      LIMITATION ON MERGER, SALE OR CONSOLIDATION.............................71
     SECTION 5.2.      SUCCESSOR CORPORATION SUBSTITUTED.......................................72

ARTICLE VI

                       EVENTS OF DEFAULT AND REMEDIES..........................................72
     SECTION 6.1.      EVENTS OF DEFAULT.......................................................72
     SECTION 6.2.      ACCELERATION OF MATURITY DATE; RESCISSION AND ANNULMENT.................74
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     SECTION 6.3.      COLLECTION OF INDEBTEDNESS AND SUITS FOR ENFORCEMENT BY TRUSTEE.........74
     SECTION 6.4.      TRUSTEE MAY FILE PROOFS OF CLAIM........................................75
     SECTION 6.5.      TRUSTEE MAY ENFORCE CLAIMS WITHOUT POSSESSION OF NOTES..................76
     SECTION 6.6.      PRIORITIES..............................................................76
     SECTION 6.7.      LIMITATION ON SUITS.....................................................77
     SECTION 6.8.      UNCONDITIONAL RIGHT OF HOLDERS TO RECEIVE PRINCIPAL, PREMIUM AND
                       INTEREST................................................................77
     SECTION 6.9.      RIGHTS AND REMEDIES CUMULATIVE..........................................78
     SECTION 6.10.     DELAY OR OMISSION NOT WAIVER............................................78
     SECTION 6.11.     CONTROL BY HOLDERS......................................................78
     SECTION 6.12.     WAIVER OF EXISTING OR PAST DEFAULT......................................78
     SECTION 6.13.     UNDERTAKING FOR COSTS...................................................79
     SECTION 6.14.     RESTORATION OF RIGHTS AND REMEDIES......................................79

ARTICLE VII
                       TRUSTEE.................................................................80
     SECTION 7.1.      DUTIES OF TRUSTEE.......................................................80
     SECTION 7.2.      RIGHTS OF TRUSTEE.......................................................81
     SECTION 7.3.      INDIVIDUAL RIGHTS OF TRUSTEE............................................82
     SECTION 7.4.      TRUSTEE'S DISCLAIMER....................................................82
     SECTION 7.5.      NOTICE OF DEFAULT.......................................................83
     SECTION 7.6.      REPORTS BY TRUSTEE TO HOLDERS...........................................83
     SECTION 7.7.      COMPENSATION AND INDEMNITY..............................................83
     SECTION 7.8.      REPLACEMENT OF TRUSTEE..................................................84
     SECTION 7.9.      SUCCESSOR TRUSTEE BY MERGER, ETC........................................85
     SECTION 7.10.     ELIGIBILITY; DISQUALIFICATION...........................................85
     SECTION 7.11.     PREFERENTIAL COLLECTION OF CLAIMS AGAINST COMPANY.......................85

ARTICLE VIII

                       LEGAL DEFEASANCE AND COVENANT DEFEASANCE AND SATISFACTION
                       AND DISCHARGE...........................................................86
     SECTION 8.1.      OPTION TO EFFECT LEGAL DEFEASANCE OR COVENANT DEFEASANCE................86
     SECTION 8.2.      LEGAL DEFEASANCE AND DISCHARGE..........................................86
     SECTION 8.3.      COVENANT DEFEASANCE.....................................................86
     SECTION 8.4.      CONDITIONS TO LEGAL OR COVENANT DEFEASANCE..............................87
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     SECTION 8.5.      DEPOSITED CASH AND U.S. GOVERNMENT OBLIGATIONS TO BE HELD IN TRUST;
                       OTHER MISCELLANEOUS PROVISIONS..........................................88
     SECTION 8.6.      REPAYMENT TO THE COMPANY................................................89
     SECTION 8.7.      REINSTATEMENT...........................................................89
     SECTION 8.8.      SATISFACTION AND DISCHARGE..............................................89

ARTICLE IX

                       AMENDMENTS, SUPPLEMENTS AND WAIVERS.....................................90
     SECTION 9.1.      SUPPLEMENTAL INDENTURES WITHOUT CONSENT OF HOLDERS......................90
     SECTION 9.2.      AMENDMENTS, SUPPLEMENTAL INDENTURES AND WAIVERS WITH CONSENT OF
                       HOLDERS.................................................................91
     SECTION 9.3.      COMPLIANCE WITH TIA.....................................................93
     SECTION 9.4.      REVOCATION AND EFFECT OF CONSENTS.......................................93
     SECTION 9.5.      NOTATION ON OR EXCHANGE OF NOTES........................................94
     SECTION 9.6.      TRUSTEE TO SIGN AMENDMENTS, ETC.........................................94

ARTICLE X

                       RIGHT TO REQUIRE REPURCHASE.............................................94
     SECTION 10.1.     REPURCHASE OF NOTES AT THE OPTION OF THE HOLDER UPON A CHANGE OF
                       CONTROL.................................................................94

ARTICLE XI

                       GUARANTEE...............................................................97
     SECTION 11.1.     GUARANTEE...............................................................97
     SECTION 11.2.     EXECUTION AND DELIVERY OF GUARANTEE.....................................99
     SECTION 11.3.     CERTAIN BANKRUPTCY EVENTS..............................................100
     SECTION 11.4.     LIMITATION ON MERGER OF SUBSIDIARIES AND RELEASE OF GUARANTORS.........100

ARTICLE XII

                       MISCELLANEOUS..........................................................101
     SECTION 12.1.     TIA CONTROLS...........................................................101
     SECTION 12.2.     NOTICES................................................................101
     SECTION 12.3.     COMMUNICATIONS BY HOLDERS WITH OTHER HOLDERS...........................102
     SECTION 12.4.     CERTIFICATE AND OPINION AS TO CONDITIONS PRECEDENT.....................102
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     SECTION 12.5.     STATEMENTS REQUIRED IN CERTIFICATE OR OPINION..........................102
     SECTION 12.6.     RULES BY TRUSTEE, PAYING AGENT, REGISTRAR..............................103
     SECTION 12.7.     LEGAL HOLIDAYS.........................................................103
     SECTION 12.8.     GOVERNING LAW..........................................................103
     SECTION 12.9.     NO ADVERSE INTERPRETATION OF OTHER AGREEMENTS..........................104
     SECTION 12.10.    NO RECOURSE AGAINST OTHERS.............................................104
     SECTION 12.11.    SUCCESSORS.............................................................104
     SECTION 12.12.    DUPLICATE ORIGINALS....................................................104
     SECTION 12.13.    SEVERABILITY...........................................................104
     SECTION 12.14.    TABLE OF CONTENTS, HEADINGS, ETC.......................................104
     SECTION 12.15.    QUALIFICATION OF INDENTURE.............................................105
     SECTION 12.16.    REGISTRATION RIGHTS....................................................105
     SIGNATURES...............................................................................106
     EXHIBIT A................................................................................A-1
     EXHIBIT B
     FORM OF CERTIFICATE OF TRANSFER..........................................................B-1
     EXHIBIT C
     FORM OF CERTIFICATE OF EXCHANGE..........................................................C-1
     EXHIBIT D
     FORM OF CERTIFICATE FROM ACQUIRING
     INSTITUTIONAL ACCREDITED INVESTOR........................................................D-1
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                                       vi
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                              CROSS REFERENCE TABLE

         Reconciliation and tie between the Trust Indenture Act of 1939 and this
Indenture, dated __________, 2002.

<Table>
<Caption>
TIA SECTION                                                                                               INDENTURE
                                                                                                            SECTION
<S>                  <C>                                                                             <C>
Section 310          (a)(1)....................................................................................7.10
                     (a)(2)....................................................................................7.10
                     (a)(3)..........................................................................Not Applicable
                     (a)(4)..........................................................................Not Applicable
                     (a)(5)....................................................................................7.10
                     (b).......................................................................................7.10
                     (c).............................................................................Not Applicable
Section 311          (a).......................................................................................7.11
                     (b).......................................................................................7.11
Section 312          (a)........................................................................................2.5
                     (b).......................................................................................12.3
                     (c).......................................................................................12.3
Section 313          (a)........................................................................................7.6
                     (b)........................................................................................7.6
                     (c)........................................................................................7.6
                     (d)........................................................................................7.6
Section 314          (a)........................................................................................4.8
                     (a)(4).....................................................................................4.7
                     (b).............................................................................Not Applicable
                     (c)(1)....................................................................................12.4
                     (c)(2)....................................................................................12.4
                     (c)(3).....................................................................................8.4
                     (d).............................................................................Not Applicable
                     (e).......................................................................................12.5
Section 315          (a)........................................................................................7.1
                     (b)........................................................................................7.5
                     (c)........................................................................................7.1
                     (d)........................................................................................7.2
                     (e).......................................................................................6.13
Section 316          (a)........................................................................................2.9
                     (a)(1)(A).................................................................................6.11
                     (a)(1)(B).................................................................................6.12
                     (a)(2)..........................................................................Not Applicable
                     (b)........................................................................................6.8
                     (c)...................................................................................1.1, 9.4
Section 317          (a)(1).....................................................................................6.3
                     (a)(2).....................................................................................6.4
                     (b)........................................................................................2.4
Section 318          (a).......................................................................................12.1
</Table>

Note: This reconciliation and tie shall not, for any purpose, be deemed to be
part of the Indenture.
<PAGE>

                  INDENTURE, dated as of December 12, 2001, by and between
Radiologix, Inc., a Delaware corporation (the "Company"), the Guarantors (as
defined) named herein and U.S. Bank, N.A., as trustee (the "Trustee").

                  Each party hereto agrees as follows for the benefit of each
other party and for the equal and ratable benefit of the Holders of the
Company's 10.5% Series A Senior Notes due 2008 and the class of 10.5% Series B
Senior Notes due 2008 to be exchanged for the 10.5% Series A Senior Notes due
2008:

                                    ARTICLE I

                   DEFINITIONS AND INCORPORATION BY REFERENCE

SECTION 1.1. DEFINITIONS

         "144A Global Note" means one or more Global Notes bearing the Private
Placement Legend that will be issued in an aggregate amount of denominations
equal in total to the outstanding principal amount of the Notes sold in reliance
on Rule 144A.

         "501 Global Note" means one of more Global Notes bearing the Private
Placement Legend that will be issued in an aggregate amount of denominations
equal in total to the outstanding principal amount of the Notes sold to
institutional "accredited investors" within the meaning of Rule 501(a)(1), (2),
(3), or (7) of the Securities Act.

         "Acceleration Notice" shall have the meaning specified in Section 6.2.

         "Acquired Indebtedness" means Indebtedness (including Disqualified
Capital Stock) of any Person existing at the time such Person becomes a
Subsidiary of the Company, including by designation, or is merged or
consolidated into or with the Company or one of its Subsidiaries.

         "Acquisition" means the purchase or other acquisition of any Person or
all or substantially all the assets of any Person by any other Person, whether
by purchase, merger, consolidation, or other transfer, and whether or not for
consideration.

         "Additional Notes" means additional Notes having identical terms and
conditions to the Notes issued on the Issue Date that may be issued pursuant to
this Indenture after the Issue Date, other than pursuant to an Exchange Offer or
otherwise in exchange for or in replacement of outstanding Notes.

         "Affiliate" means any Person directly or indirectly controlling or
controlled by or under direct or indirect common control with the Company. For
purposes of this definition, the term "control" means the power to direct the
management and policies of a Person, directly or through one or more
intermediaries, whether through the ownership of voting securities, by contract,
or otherwise; provided, that with respect to ownership interest in the Company
and its Subsidiaries, a Beneficial Owner of 10% or more of the total voting
power normally entitled to

<PAGE>

vote in the election of directors, managers or trustees, as applicable, shall
for such purposes be deemed to possess control. Notwithstanding the foregoing,
Affiliate shall not include Subsidiaries.

         "Affiliate Transaction" shall have the meaning specified in Section
4.10.

         "Agent" means any Registrar, Paying Agent or co-Registrar.

         "Applicable Procedures" means, with respect to any transfer or exchange
of or for beneficial interests in any Global Note, the rules and procedures of
the Depositary, Euroclear and Clearstream that apply to such transfer or
exchange at the relevant time.

         "Asset Sale" shall have the meaning specified in Section 4.14.

         "Asset Sale Offer" shall have the meaning specified in Section 4.14.

         "Asset Sale Offer Amount" shall have the meaning specified in Section
4.14.

         "Asset Sale Offer Period" shall have the meaning specified in Section
4.14.

         "Asset Sale Offer Price" shall have the meaning specified in Section
4.14.

         "Attributable Indebtedness" in respect of a sale and leaseback
transaction means, at the time of determination, the present value of the
obligation of the lessee for net rental payments during the remaining term of
the lease included in such sale and leaseback transaction including any period
for which such lease has been extended or may, at the option of the lessor, be
extended. Such present value shall be calculated using a discount rate equal to
the rate of interest implicit in such transaction, determined in accordance with
GAAP.

         "Authentication Order" shall have the meaning specified in Section 2.2.

         "Average Life" means, as of the date of determination, with respect to
any security or instrument, the quotient obtained by dividing (1) the sum of the
products (a) of the number of years from the date of determination to the date
or dates of each successive scheduled principal (or redemption) payment of such
security or instrument and (b) the amount of each such respective principal (or
redemption) payment by (2) the sum of all such principal (or redemption)
payments.

         "Bankruptcy Law" means Title 11, U.S. Code, or any similar Federal,
state or foreign law for the relief of debtors.

         "Beneficial Owner" or "beneficial owner" for purposes of the definition
of Change of Control and Affiliate has the meaning attributed to it in Rules
13d-3 and 13d-5 under the Exchange Act (as in effect on the Issue Date), whether
or not applicable.

                                       2
<PAGE>

         "Board of Directors" means, with respect to any Person, the board of
directors (or if such Person is not a corporation, the equivalent board of
managers or members or body performing similar functions for such Person) of
such Person or any committee of the Board of Directors of such Person
authorized, with respect to any particular matter, to exercise the power of the
board of directors of such Person.

         "Board Resolution" means, with respect to any Person, a duly adopted
resolution of the Board of Directors of such Person.

         "Broker-Dealer" means any broker-dealer that receives Exchange Notes
for its own account in the Exchange Offer in exchange for Notes that were
acquired by such broker-dealer as a result of market-making or other trading
activities.

         "Business Day" means each Monday, Tuesday, Wednesday, Thursday and
Friday which is not a day on which banking institutions in New York, New York
are authorized or obligated by law or executive order to close.

         "Capitalized Lease Obligation" means, as to any Person, the obligations
of such Person under a lease that are required to be classified and accounted
for as capital lease obligations under GAAP and, for purposes of this
definition, the amount of such obligations at any date shall be the capitalized
amount of such obligations at such date, determined in accordance with GAAP.

         "Capital Stock" means, with respect to any corporation, any and all
shares, interests, rights to purchase (other than convertible or exchangeable
Indebtedness that is not itself otherwise capital stock), warrants, options,
participations or other equivalents of or interests (however designated) in
stock issued by that corporation.

         "Cash" or "cash" means such coin or currency of the United States of
America as at the time of payment shall be legal tender for the payment of
public or private debts.

         "Cash Equivalent" means:

                  (1) securities issued or directly and fully guaranteed or
         insured by the United States of America or any agency or
         instrumentality thereof (provided, that the full faith and credit of
         the United States of America is pledged in support thereof); or

                  (2) demand and time deposits and certificates of deposit and
         commercial paper issued by the parent corporation of any domestic
         commercial bank of recognized standing having capital and surplus in
         excess of $500,000,000; or

                  (3) commercial paper issued by others rated at least A-2 or
         the equivalent thereof by Standard & Poor's Corporation or at least P-2
         or the equivalent thereof by Moody's Investors Service, Inc.; or

                                       3
<PAGE>

                  (4) repurchase obligations with a term of not more than seven
         days for underlying securities of the types described in clause (1)
         above entered into with any commercial bank meeting the specifications
         of clause (2) above; or

                  (5) investments in money market or other mutual funds
         substantially all of whose assets comprise securities of the types
         described in clauses (1) through (4) above;

and in the case of each of (1), (2), and (3) maturing within one year after the
date of acquisition.

         "Change of Control" means:

                  (1) any sale, transfer, conveyance or other disposition (other
         than by way of merger or consolidation) of all or substantially all of
         the Company's assets, on a consolidated basis, in one transaction or a
         series of related transactions, to any "person" (including any group
         that is deemed to be a "person");

                  (2) the consummation of any transaction, including, without
         limitation, any merger or consolidation, whereby any "person"
         (including any group that is deemed to be a "person") is or becomes the
         "beneficial owner," directly or indirectly, of more than 35% of the
         aggregate Voting Equity Interests of the transferee(s) or surviving
         entity or entities;

                  (3) the Continuing Directors cease for any reason to
         constitute a majority of the Company's Board of Directors then in
         office; or

                  (4) the Company adopts a plan of liquidation.

         As used in this definition, "person" (including any group that is
deemed to be a "person") has the meaning given by Section 13(d) of the Exchange
Act, whether or not applicable.

         "Change of Control Offer" shall have the meaning specified in Section
10.1.

         "Change of Control Offer Period" shall have the meaning specified in
Section 10.1.

         "Change of Control Purchase Date" shall have the meaning specified in
Section 10.1.

         "Change of Control Purchase Price" shall have the meaning specified in
Section 10.1.

         "Clearstream" means Clearstream Banking S.A., or its successors, as
operators of the Clearstream system.

         "Code" means the Internal Revenue Code of 1986, as amended.

                                       4
<PAGE>

         "Company" means the party named as such in this Indenture until a
successor replaces it pursuant to this Indenture, and thereafter means such
successor.

         "Consolidation" means, with respect to the Company, the consolidation
of the accounts of the Subsidiaries with those of the Company, all in accordance
with GAAP; provided, that "consolidation" will not include consolidation of the
accounts of any Unrestricted Subsidiary with the accounts of the Company. The
term "consolidated" has a correlative meaning to the foregoing.

         "Consolidated Coverage Ratio" of any Person on any date of
determination (the "Transaction Date") means the ratio, on a pro forma basis, of
(a) the aggregate amount of Consolidated EBITDA of such Person attributable to
continuing operations and businesses (exclusive of amounts attributable to
operations and businesses permanently discontinued or disposed of) for the
Reference Period to (b) the aggregate Consolidated Fixed Charges of such Person
(exclusive of amounts attributable to operations and businesses permanently
discontinued or disposed of, but only to the extent that the obligations giving
rise to such Consolidated Fixed Charges would no longer be obligations
contributing to such Person's Consolidated Fixed Charges subsequent to the
Transaction Date) during the Reference Period; provided, that for purposes of
such calculation:

                  (1) Acquisitions which occurred during the Reference Period or
         subsequent to the Reference Period and on or prior to the Transaction
         Date shall be assumed to have occurred on the first day of the
         Reference Period;

                  (2) transactions giving rise to the need to calculate the
         Consolidated Coverage Ratio shall be assumed to have occurred on the
         first day of the Reference Period;

                  (3) other than Indebtedness incurred under any revolving
         credit facility, the incurrence of any Indebtedness (including the
         issuance of any Disqualified Capital Stock) during the Reference Period
         or subsequent to the Reference Period and on or prior to the
         Transaction Date (and the application of the proceeds therefrom to the
         extent used to refinance or retire other Indebtedness) shall be assumed
         to have occurred on the first day of the Reference Period; and

                  (4) the Consolidated Fixed Charges of such Person attributable
         to interest on any Indebtedness or dividends on any Disqualified
         Capital Stock bearing a floating interest (or dividend) rate shall be
         computed on a pro forma basis as if the average rate in effect from the
         beginning of the Reference Period to the Transaction Date had been the
         applicable rate for the entire period, unless such Person or any of its
         Subsidiaries is a party to an Interest Swap or Hedging Obligation
         (which shall remain in effect for the 12-month period immediately
         following the Transaction Date) that has the effect of fixing the
         interest rate on the date of computation, in which case such rate
         (whether higher or lower) shall be used.

                                       5
<PAGE>

         "Consolidated EBITDA" means, with respect to any Person, for any
period, the Consolidated Net Income of such Person for such period adjusted to
add thereto (to the extent deducted from net revenues in determining
Consolidated Net Income), without duplication, the sum of:

                  (1) Consolidated income tax expense (except to the extent
         attributable to items of extraordinary or nonrecurring gain or loss as
         described in clause (a) of the definition of Consolidated Net Income);

                  (2) Consolidated depreciation and amortization expense;

                  (3) Consolidated Fixed Charges;

                  (4) all other non-cash charges required to be reflected as
         expenses on the books and records of such Person and its Consolidated
         Subsidiaries; and

                  (5) the amount of any earn-out payment or bonus paid by the
         Company or any Subsidiary of the Company for such period to the
         seller(s) of any Capital Stock or business acquired by the Company or
         any such Subsidiary, which payment is made pursuant to the terms of a
         purchase or similar agreement entered into at the time of the
         acquisition;

less the amount of all cash payments made by such Person or any of its
Subsidiaries during such period to the extent such payments relate to non-cash
charges that were added back in determining Consolidated EBITDA for such period
or any prior period; provided, that consolidated income tax expense and
depreciation and amortization of a Subsidiary that is a less than Wholly Owned
Subsidiary shall only be added to the extent of the equity interest of the
Company in such Subsidiary.

         "Consolidated Fixed Charges" of any Person means, for any period, the
aggregate amount (without duplication and determined in each case in accordance
with GAAP) of:

                  (a) interest expensed or capitalized, paid, accrued, or
         scheduled to be paid or accrued (including, in accordance with the
         following sentence, interest attributable to Capitalized Lease
         Obligations and imputed interest on Attributable Indebtedness) of such
         Person and its Consolidated Subsidiaries during such period, including
         (1) original issue discount and non-cash interest payments or accruals
         on any Indebtedness, (2) amortization of Indebtedness discount or
         premium, (3) the interest portion of all deferred payment obligations,
         (4) all commissions, discounts and other fees and charges owed with
         respect to bankers' acceptances and letters of credit financings and
         currency and Interest Swap and Hedging Obligations, in each case to the
         extent attributable to such period, and (5) all interest payable with
         respect to discontinued operations;

                                       6
<PAGE>

                  (b) the amount of dividends accrued or payable (or guaranteed)
         by such Person or any of its Consolidated Subsidiaries in respect of
         Preferred Stock (other than by Subsidiaries of such Person to such
         Person or such Person's Wholly Owned Subsidiaries) multiplied by a
         fraction, the numerator of which is one and the denominator of which is
         one minus the then current combined federal, state and local statutory
         tax rate of the Company and its Subsidiaries, expressed as a decimal.

For purposes of this definition, (x) interest on a Capitalized Lease Obligation
shall be deemed to accrue at an interest rate reasonably determined in good
faith by the Company to be the rate of interest implicit in such Capitalized
Lease Obligation in accordance with GAAP and (y) interest expense attributable
to any Indebtedness represented by the guarantee by such Person or a Subsidiary
of such Person of an obligation of another Person shall be deemed to be the
interest expense attributable to the Indebtedness guaranteed.

         "Consolidated Net Income" means, with respect to any Person for any
period, the net income (or loss) of such Person and its Consolidated
Subsidiaries (determined on a consolidated basis in accordance with GAAP) for
such period, adjusted to exclude (only to the extent included in computing such
net income (or loss) and without duplication):

                  (a) all gains and losses, together with any related provision
         for taxes on such gains or losses, that are either extraordinary (as
         determined in accordance with GAAP) or are nonrecurring (including any
         gain or loss from the sale or other disposition of assets outside the
         ordinary course of business or from the issuance or sale of any capital
         stock);

                  (b) the net income, if positive, of any Person, other than a
         Consolidated Subsidiary, in which such Person or any of its
         Consolidated Subsidiaries has an interest, except to the extent of the
         amount of any dividends or distributions actually paid in cash to such
         Person or a Consolidated Subsidiary of such Person during such period,
         but in any case not in excess of such Person's pro rata share of such
         Person's net income for such period;

                  (c) the net income or loss of any Person acquired in a pooling
         of interests transaction for any period prior to the date of such
         acquisition;

                  (d) the net income, if positive, of any of such Person's
         Consolidated Subsidiaries to the extent that the declaration or payment
         of dividends or similar distributions is not at the time permitted by
         operation of the terms of its charter or bylaws or any other agreement,
         instrument, judgment, decree, order, statute, rule or governmental
         regulation applicable to such Consolidated Subsidiary; and

                  (e) solely for the purpose of calculating Consolidated Net
         Income with respect to paragraph (3)(a) of Section 4.3, the amount of
         any goodwill impairment and valuation losses, as reflected in the
         Company's consolidated financial statements.

                                       7
<PAGE>

         "Consolidated Net Worth" of any Person at any date means the aggregate
consolidated stockholders' equity of such Person (plus amounts of equity
attributable to preferred stock) and its Consolidated Subsidiaries, as would be
shown on the consolidated balance sheet of such Person prepared in accordance
with GAAP, adjusted to exclude (to the extent included in calculating such
equity), (a) the amount of any such stockholders' equity attributable to
Disqualified Capital Stock or treasury stock of such Person and its Consolidated
Subsidiaries, (b) all upward revaluations and other write-ups in the book value
of any asset of such Person or a Consolidated Subsidiary of such Person
subsequent to the Issue Date, and (c) all investments in subsidiaries that are
not Consolidated Subsidiaries and in Persons that are not Subsidiaries.

         "Consolidated Subsidiary" means, for any Person, each Subsidiary of
such Person (whether now existing or hereafter created or acquired) the
financial statements of which are consolidated for financial statement reporting
purposes with the financial statements of such Person in accordance with GAAP.

         "Consolidated Tangible Assets" means, as of the date of determination,
the total assets, less goodwill and other intangibles, shown on the balance
sheet of the Company and its Consolidated Subsidiaries as of the most recent
date for which such a balance sheet is available, determined on a consolidated
basis in accordance with GAAP.

         "Continuing Directors" means during any period of 12 consecutive months
after the Issue Date, individuals who at the beginning of any such 12-month
period constituted the Board of Directors of the Company (together with any new
directors whose election by such Board of Directors or whose nomination for
election by the shareholders of the Company was approved by a vote of a majority
of the directors then still in office who were either directors at the beginning
of such period or whose election or nomination for election was previously so
approved, including new directors designated in or provided for in an agreement
regarding the merger, consolidation or sale, transfer or other conveyance, of
all or substantially all of the assets of the Company, if such agreement was
approved by a vote of such majority of directors).

         "Convertible Note" means that certain Convertible Junior Subordinated
Promissory Note due July 31, 2009, made by the Company in favor of BT Capital
Partners SBIC, L.P., dated August 1, 1999, as the same may be amended in a
manner not prohibited by this Indenture.

         "Corporate Trust Office" means the principal office of the Trustee at
which at any time its corporate trust business shall be administered, which
office at the date hereof is located at 180 East Fifth Street, St. Paul,
Minnesota 55101, Attention: Corporate Trust Department, or such other address as
the Trustee may designate from time to time by notice to the Holders and the
Company, or the principal corporate trust office of any successor Trustee (or
such other address as a successor Trustee may designate from time to time by
notice to the Holders and the Company), in either case which shall be located in
the Borough of Manhattan, The City of New York.

                                       8
<PAGE>

         "Covenant Defeasance" shall have the meaning specified in Section 8.3.

         "Credit Agreement" means the credit agreement to be entered into by and
among the Company, certain of its Subsidiaries, certain financial institutions
and General Electric Capital Corporation, as agent, providing for an aggregate
$35,000,000 revolving credit facility, including any related notes, guarantees,
collateral documents, instruments and agreements executed in connection
therewith, as such credit agreement and/or related documents may be amended,
restated, supplemented, renewed, replaced or otherwise modified from time to
time whether or not with the same agent, trustee, representative lenders or
holders, and, subject to the proviso to the next succeeding sentence,
irrespective of any changes in the terms and conditions thereof. Without
limiting the generality of the foregoing, the term "Credit Agreement" shall
include any amendment, amendment and restatement, renewal, extension,
restructuring, supplement or modification to any Credit Agreement and all
refundings, refinancings and replacements of any Credit Agreement, including any
Credit Agreement:

                  (1) extending the maturity of any Indebtedness incurred
         thereunder or contemplated thereby;

                  (2) adding or deleting borrowers or guarantors thereunder, so
         long as borrowers and issuers include one or more of the Company and
         its Subsidiaries and their respective successors and assigns;

                  (3) increasing the amount of Indebtedness incurred thereunder
         or available to be borrowed thereunder; provided, that on the date such
         Indebtedness is incurred it would not be prohibited by Section 4.11; or

                  (4) otherwise altering the terms and conditions thereof in a
         manner not prohibited by the terms of this Indenture.

         "Custodian" means any receiver, trustee, assignee, liquidator,
sequestrator or similar official under any Bankruptcy Law.

         "Debt Incurrence Ratio" shall have the meaning specified in Section
4.11.

         "Default" means any event that is or with the passage of time or the
giving of notice or both would be an Event of Default.

         "Defaulted Interest" shall have the meaning specified in Section 2.12.

         "Definitive Notes" means one or more certificated Notes registered in
the name of the Holder thereof and issued in accordance with Section 2.6 hereof,
in the form of Exhibit A hereto except that such Note shall not include the
information called for by footnotes 3, 4 and 8 thereof.

                                       9
<PAGE>

         "Depositary" means, with respect to the Notes issuable or issued in
whole or in part in global form, the person specified in Section 2.3 as the
Depositary with respect to the Notes, until a successor shall have been
appointed and become such pursuant to the applicable provision of this
Indenture, and thereafter "Depositary" shall mean or include such successor.

         "Disqualified Capital Stock" means with respect to any Person, (a)
Equity Interests of such Person that, by its terms or by the terms of any
security into which it is convertible, exercisable or exchangeable, is, or upon
the happening of an event or the passage of time or both would be, required to
be redeemed or repurchased including at the option of the holder thereof by such
Person or any of its Subsidiaries, in whole or in part, on or prior to 91 days
following the Stated Maturity of the Notes and (b) any Equity Interests of any
Subsidiary of such Person other than any common equity with no preferences,
privileges, and no redemption or repayment provisions. Notwithstanding the
foregoing, any Equity Interests that would constitute Disqualified Capital Stock
solely because the holders thereof have the right to require the Company to
repurchase such Equity Interests upon the occurrence of a change of control or
an asset sale shall not constitute Disqualified Capital Stock if the terms of
such Equity Interests provide that the Company may not repurchase or redeem any
such Equity Interests pursuant to such provisions prior to the Company's
purchase of the Notes as are required to be purchased pursuant to Section 4.14
or Section 10.1.

         "Distribution Compliance Period" means the 40-day restricted period, as
defined in Rule 903(b)(3) under the Securities Act.

         "DTC" shall have the meaning specified in Section 2.3.

         "Equity Interests" means Capital Stock or partnership, participation or
membership interests and all warrants, options or other rights to acquire
Capital Stock or partnership, participation or membership interests (but
excluding any debt security that is convertible into, or exchangeable for,
Capital Stock or partnership, participation or membership interests).

         "Euroclear" means Euroclear Bank S.A./N.V., or its successors, as
operators of the Euroclear system.

         "Event of Default" shall have the meaning specified in Section 6.1.

         "Excess Proceeds" shall have the meaning specified in Section 4.14.

         "Exchange Act" means the Securities Exchange Act of 1934, as amended,
and the rules and regulations of the SEC promulgated thereunder.

         "Exchange Notes" means 10.5% Senior Notes due 2008, Series B, of the
Company, including the guarantees endorsed thereon, identical in all respects to
the Notes and the Guarantees, except for references to series and restrictive
legends, issued pursuant to an Exchange Offer.

                                       10
<PAGE>

         "Exchange Offer" means an offer that may be made by the Company
pursuant to the Registration Rights Agreement to exchange Exchange Notes for
Series A Notes.

         "Exchange Offer Registration Statement" shall have the meaning set
forth in the Registration Rights Agreement.

         "Exempted Affiliate Transaction" means (a) customary employee
compensation arrangements approved by a majority of independent (as to such
transactions) members of the Board of Directors of the Company, (b) dividends
permitted under the terms of Section 4.3 and payable, in form and amount, on a
pro rata basis to all holders of common stock of the Company, (c) transactions
solely between or among the Company and any of its Consolidated Subsidiaries or
solely among Consolidated Subsidiaries of the Company, and (d) transactions in
respect of the Convertible Note between the Company and the Holder of the
Convertible Note (other than an increase in the amount of principal or interest
payable thereon), including any amendments or modifications to the conversion
provisions thereof (and any related definitions).

         "Existing Indebtedness" means the Indebtedness of the Company and its
Subsidiaries (other than Indebtedness under the Credit Agreement) in existence
on the Issue Date, reduced to the extent such amounts are repaid, refinanced or
retired.

         "Foreign Subsidiary" means any Subsidiary of the Company which (i) is
not organized under the laws of the United States, any state thereof or the
District of Columbia and (ii) conducts substantially all of its business
operations outside the United States of America.

         "GAAP" means United States generally accepted accounting principles set
forth in the opinions and pronouncements of the Accounting Principles Board of
the American Institute of Certified Public Accountants and statements and
pronouncements of the Financial Accounting Standards Board or in such other
statements by such other entity as approved by a significant segment of the
accounting profession in the United States as in effect on the Issue Date.

         "Global Notes" means one or more Notes in the form of Exhibit A hereto
that includes the information referred to in footnotes 3, 4 and 8 to the form of
Note, attached hereto as Exhibit A, issued under this Indenture, that is
deposited with or on behalf of and registered in the name of the Depositary or
its nominee.

         "Global Note Legend" means the legend set forth in Section 2.6(g)(2),
which is required to be placed on all Global Notes issued under this Indenture.

         "Guarantee" shall have the meaning provided in Section 11.1.

         "Guarantor" means each of the Company's present and future Subsidiaries
that at the time are guarantors of the Notes in accordance with this Indenture.

         "Holder" or "Securityholder" means the Person in whose name a Note is
registered on the Registrar's books.

                                       11
<PAGE>

         "Incur" or "incurrence" shall have the meaning specified in Section
4.11.

         "Incurrence Date" shall have the meaning specified in Section 4.11.

         "Indebtedness" of any Person means, without duplication,

                  (a) all liabilities and obligations, contingent or otherwise,
         of such Person, to the extent such liabilities and obligations would
         appear as a liability upon the consolidated balance sheet of such
         Person in accordance with GAAP, (1) in respect of borrowed money
         (whether or not the recourse of the lender is to the whole of the
         assets of such Person or only to a portion thereof), (2) evidenced by
         bonds, notes, debentures or similar instruments, (3) representing the
         balance deferred and unpaid of the purchase price of any property or
         services, except those incurred in the ordinary course of its business
         that would constitute ordinarily a trade payable to trade creditors;

                  (b) all liabilities and obligations, contingent or otherwise,
         of such Person (1) evidenced by bankers' acceptances or similar
         instruments issued or accepted by banks, (2) relating to any
         Capitalized Lease Obligation, or (3) evidenced by a letter of credit or
         a reimbursement obligation of such Person with respect to any letter of
         credit;

                  (c) all net obligations of such Person under Interest Swap and
         Hedging Obligations;

                  (d) all liabilities and obligations of others of the kind
         described in the preceding clause (a), (b) or (c) that such Person has
         guaranteed or provided credit support or that is otherwise its legal
         liability or which are secured by any assets or property of such
         Person;

                  (e) any and all deferrals, renewals, extensions, refinancing
         and refundings (whether direct or indirect) of, or amendments,
         modifications or supplements to, any liability of the kind described in
         any of the preceding clauses (a), (b), (c) or (d), or this clause (e),
         whether or not between or among the same parties;

                  (f) all Disqualified Capital Stock of such Person (measured at
         the greater of its voluntary or involuntary maximum fixed repurchase
         price plus accrued and unpaid dividends); and

                  (g) all Attributable Indebtedness.

For purposes hereof, the "maximum fixed repurchase price" of any Disqualified
Capital Stock which does not have a fixed repurchase price shall be calculated
in accordance with the terms of such Disqualified Capital Stock as if such
Disqualified Capital Stock were purchased on any

                                       12
<PAGE>

date on which Indebtedness shall be required to be determined pursuant to the
terms hereof, and if such price is based upon, or measured by, the fair market
value of such Disqualified Capital Stock, such fair market value to be
determined in good faith by the Board of Directors of the issuer (or managing
general partner of the issuer) of such Disqualified Capital Stock.

         The amount of any Indebtedness outstanding as of any date shall be (1)
the accreted value thereof, in the case of any Indebtedness issued with original
issue discount, but the accretion of original issue discount in accordance with
the original terms of Indebtedness issued with an original issue discount will
not be deemed to be an incurrence and (2) the principal amount thereof, together
with any interest thereon that is more than 30 days past due, in the case of any
other Indebtedness.

         "Indenture" means this Indenture, as amended or supplemented from time
to time in accordance with the terms hereof.

         "Indirect Participant" means any entity that, with respect to DTC,
clears through or maintains a direct or indirect, custodial relationship with a
Participant.

         "Initial Notes" means the 10.5% Series A Senior Notes due 2008, as
supplemented from time to time in accordance with the terms hereof, issued under
this Indenture that contain the information referred to in footnotes 5 and 6 to
the form of Note attached hereto as Exhibit A.

         "Initial Purchasers" means Jefferies & Company, Inc. and Deutsche Banc
Alex. Brown Inc.

         "Institutional Accredited Investor" means an institution that is an
"accredited investor" as defined in Rule 501(a)(1), (2), (3) or (7) under the
Securities Act, who is not also a QIB.

         "Interest Payment Date" means the stated due date of an installment of
interest on the Notes.

         "Interest Swap and Hedging Obligation" means any obligation of any
Person pursuant to any interest rate swap agreement, interest rate cap
agreement, interest rate collar agreement, interest rate exchange agreement,
currency exchange agreement or any other agreement or arrangement designed to
protect against fluctuations in interest rates or currency values, including,
without limitation, any arrangement whereby, directly or indirectly, such Person
is entitled to receive from time to time periodic payments calculated by
applying either a fixed or floating rate of interest on a stated notional amount
in exchange for periodic payments made by such Person calculated by applying a
fixed or floating rate of interest on the same notional amount.

                                       13
<PAGE>

         "Investment" by any Person in any other Person means (without
duplication):

                  (a) the acquisition (whether by purchase, merger,
         consolidation or otherwise) by such Person (whether for cash, property,
         services, securities or otherwise) of Equity Interests, capital stock,
         bonds, notes, debentures, partnership or other ownership interests or
         other securities, including any options or warrants, of such other
         Person or any agreement to make any such acquisition;

                  (b) the making by such Person of any deposit with, or advance,
         loan or other extension of credit to, such other Person (including the
         purchase of property from another Person subject to an understanding or
         agreement, contingent or otherwise, to resell such property to such
         other Person) or any commitment to make any such advance, loan or
         extension (but excluding accounts receivable, endorsements for
         collection or deposits arising in the ordinary course of business);

                  (c) other than guarantees of Indebtedness of the Company or
         any Guarantor to the extent permitted by Section 4.11, the entering
         into by such Person of any guarantee of, or other credit support or
         contingent obligation with respect to, Indebtedness or other liability
         of such other Person;

                  (d) the making of any capital contribution by such Person to
         such other Person; and

                  (e) the designation by the Board of Directors of the Company
         of any Person to be an Unrestricted Subsidiary.

The Company shall be deemed to make an Investment in an amount equal to the fair
market value of the net assets of any subsidiary (or, if neither the Company nor
any of its Subsidiaries has theretofore made an Investment in such subsidiary,
in an amount equal to the Investments being made), at the time that such
subsidiary is designated an Unrestricted Subsidiary, and any property
transferred to an Unrestricted Subsidiary from the Company or a Subsidiary of
the Company shall be deemed an Investment valued at its fair market value at the
time of such transfer. The Company or any of its Subsidiaries shall be deemed to
have made an Investment in a Person that is or was required to be a Guarantor
if, upon the issuance, sale or other disposition of any portion of the Company's
or the Subsidiary's ownership in the Capital Stock of such Person, such Person
ceases to be a Guarantor. The fair market value of each Investment shall be
measured at the time made or returned, as applicable.

         "Issue Date" means the date of first issuance of the Notes under this
Indenture.

         "Legal Defeasance" shall have the meaning specified in Section 8.2.

         "Legal Holiday" shall have the meaning specified in Section 12.7.

         "Lien" means any mortgage, charge, pledge, lien (statutory or
otherwise), privilege, security interest, hypothecation or other encumbrance
upon or with respect to any property of any kind, real or personal, movable or
immovable, now owned or hereafter acquired.

                                       14
<PAGE>

         "Liquidated Damages" means all liquidated damages then owing pursuant
to the Registration Rights Agreement.

         "Maturity Date" means, when used with respect to any Note, the date
specified on such Note as the fixed date on which the final installment of
principal of such Note is due and payable (in the absence of any acceleration
thereof pursuant to the provisions of this Indenture regarding acceleration of
Indebtedness or any Change of Control Offer or Asset Sale Offer).

         "Moody's" means Moody's Investors Service, Inc. and its successors.

         "Net Cash Proceeds" means the aggregate amount of cash or Cash
Equivalents received by the Company in the case of a sale of Qualified Capital
Stock and by the Company and its Subsidiaries in respect of an Asset Sale plus,
in the case of an issuance of Qualified Capital Stock upon any exercise,
exchange or conversion of securities (including options, warrants, rights and
convertible or exchangeable debt) of the Company that were issued for cash on or
after the Issue Date, the amount of cash originally received by the Company upon
the issuance of such securities (including options, warrants, rights and
convertible or exchangeable debt) less, in each case, the sum of all payments,
fees, commissions and (in the case of Asset Sales, reasonable and customary),
expenses (including, without limitation, the fees and expenses of legal counsel
and investment banking fees and expenses) incurred in connection with such Asset
Sale or sale of Qualified Capital Stock, and, in the case of an Asset Sale only,
less (a) the amount (estimated reasonably and in good faith by the Company) of
income, franchise, sales and other applicable taxes required to be paid by the
Company or any of its respective Subsidiaries in connection with such Asset Sale
in the taxable year that such sale is consummated or in the immediately
succeeding taxable year, the computation of which shall take into account the
reduction in tax liability resulting from any available operating losses and net
operating loss carryovers, tax credits and tax credit carryforwards, and similar
tax attributes, and (b) appropriate amounts to be provided by the Company or any
of its Subsidiaries, as the case may be, as a reserve required in accordance
with GAAP against any liabilities associated with such Asset Sale and retained
by the Company or any such Subsidiary, as the case may be, after such Asset
Sale, including pensions and other post-employment benefit liabilities,
liabilities related to environmental matters and liabilities under any
indemnification obligations associated with such Asset Sale, all as reflected in
an Officers' Certificate delivered to the Trustee; provided, however, that any
amounts remaining after adjustments, revaluations or liquidations of such
reserves shall constitute Net Cash Proceeds.

         "Non-Recourse Indebtedness" means Indebtedness (a) as to which neither
the Company nor any of its Subsidiaries (1) provides credit support of any kind
(including any undertaking, agreement or instrument that would constitute
Indebtedness), (2) is directly or indirectly liable (as a guarantor or
otherwise), or (3) constitutes the lender, and (b) no default with respect to
which (including any rights that the holders thereof may have to take
enforcement action against an Unrestricted Subsidiary) would permit (upon
notice, lapse of time or both) any holder of any other Indebtedness of the
Company or any of its Subsidiaries to declare a default on such other
Indebtedness or cause the payment thereof to be accelerated or payable prior to
its stated maturity.

                                       15
<PAGE>

         "Notes" means, collectively (i) the Initial Notes, (ii) the Exchange
Notes, when and if issued as provided in the Registration Rights Agreement, and
(iii) the Additional Notes.

         "Offering" means the offering of the Notes by the Company.

         "Officer" means, with respect to the Company or any Guarantor, the
Chief Executive Officer, the President, any Vice President, the Chief Financial
Officer, the Treasurer, the Controller, or the Secretary of the Company or such
Guarantor.

         "Officers' Certificate" means, with respect to the Company or any
Guarantor, a certificate signed by two Officers or by an Officer and an
Assistant Secretary of the Company or such Guarantor and otherwise complying
with the requirements of Sections 12.4 and 12.5.

         "Opinion of Counsel" means a written opinion from legal counsel who is
reasonably acceptable to the Trustee complying with the requirements of Sections
12.4 and 12.5.

         "Participant" means, with respect to the Depositary, Euroclear or
Clearstream, a Person who has an account with the Depositary, Euroclear or
Clearstream, respectively (and, with respect to The Depository Trust Company,
shall include Euroclear and Clearstream).

         "Paying Agent" shall have the meaning specified in Section 2.3.

         "Permitted Indebtedness" means that:

                  (a) the Company and the Guarantors may incur Indebtedness
         evidenced by the Notes and the Guarantees issued pursuant to this
         Indenture up to the amounts being issued on the original Issue Date
         less any amounts repaid or retired;

                  (b) the Company and the Guarantors, as applicable, may incur
         Refinancing Indebtedness with respect to any Existing Indebtedness or
         any Indebtedness (including Disqualified Capital Stock), described in
         clause (a) of this definition or clause (a) of the third paragraph of,
         or incurred pursuant to the Debt Incurrence Ratio test of, Section
         4.11, or which was refinanced pursuant to this clause (b);

                  (c) the Company and its Subsidiaries may incur Indebtedness
         solely in respect of bankers acceptances, letters of credit and
         performance bonds (to the extent that such incurrence does not result
         in the incurrence of any obligation to repay any obligation relating to
         borrowed money or other Indebtedness), all in the ordinary course of
         business in accordance with customary industry practices, in amounts
         and for the purposes customary in the Company's industry;

                                       16
<PAGE>

                  (d) the Company may incur Indebtedness owed to (borrowed from)
         any Subsidiary, and any Subsidiary may incur Indebtedness owed to
         (borrowed from) any other Subsidiary or the Company; provided, that in
         the case of Indebtedness of the Company, such obligations shall be
         unsecured and contractually subordinated in all respects to the
         Company's obligations pursuant to the Notes and any event that causes
         such Subsidiary no longer to be a Subsidiary respectively (including by
         designation to be an Unrestricted Subsidiary) shall be deemed to be a
         new incurrence by such issuer of such Indebtedness and any guarantor
         thereof subject to the provisions of Section 4.11;

                  (e) any Guarantor may guarantee any Indebtedness of the
         Company or another Guarantor that was permitted to be incurred pursuant
         to this Indenture, substantially concurrently with such incurrence or
         at the time such Person becomes a Subsidiary;

                  (f) the Company and the Guarantors may incur Interest Swap and
         Hedging Obligations that are incurred for the purpose of fixing or
         hedging interest rate or currency risk with respect to any fixed or
         floating rate Indebtedness that is permitted by this Indenture to be
         outstanding or any receivable or liability the payment of which is
         determined by reference to a foreign currency; provided, that the
         notional amount of any such Interest Swap and Hedging Obligation does
         not exceed the principal amount of Indebtedness to which such Interest
         Swap and Hedging Obligation relates;

                  (g) Indebtedness arising from the honoring by a bank or other
         financial institution of a check, draft or similar instrument
         inadvertently (except in the case of daylight overdrafts) drawn against
         insufficient funds in the ordinary course of business; provided,
         however, that such Indebtedness if extinguished within five business
         days of incurrence;

                  (h) Indebtedness arising in connection with endorsement of
         instruments for deposit in the ordinary course of business; and

                  (i) Indebtedness arising from the payment of interest on the
         Convertible Note in the form of additional like securities with a
         principal amount equal to the amount of accrued but unpaid interest due
         thereon in accordance with the terms of Section 1 (Interest) of the
         Convertible Note.

         "Permitted Investment" means:

                  (a) any Investment in any of the Notes;

                  (b) any Investment in Cash Equivalents;

                  (c) intercompany notes to the extent permitted under clause
         (d) of the definition of "Permitted Indebtedness";

                                       17
<PAGE>

                  (d) any Investment by the Company or any Guarantor in a Person
         in a Related Business if as a result of such Investment such Person
         immediately becomes a Guarantor or such Person is immediately merged
         with or into the Company or a Guarantor;

                  (e) any Investment by the Company or any Subsidiary of the
         Company in the Company or in any Guarantor;

                  (f) any Investment by the Company or any Subsidiary of the
         Company in Permitted Joint Ventures made after the Reference Date
         having an aggregate fair market value, when taken together with all
         other Investments made pursuant to this clause (f) that are at the time
         outstanding, not exceeding the greater of (i) $25,000,000 and (ii) 10%
         of the Consolidated Tangible Assets of the Company as of the last day
         of the most recent full fiscal quarter ended immediately prior to the
         date of such Investment (with the fair market value of each Investment
         being measured at the time made and without giving effect to subsequent
         changes in value);

                  (g) any asset exchange permitted by clause (8) of Section
         4.14;

                  (h) loans and advances to directors, employees and officers of
         the Company and its Subsidiaries for bona fide business purposes not in
         excess of $2,000,000 at any one time outstanding;

                  (i) receivables owing to the Company or any Subsidiary of the
         Company if created or acquired in the ordinary course of business and
         payable or dischargeable in accordance with customary trade terms;
         provided, however, that such trade terms may include such concessionary
         trade terms as the Company or any such Subsidiary deems reasonable
         under the circumstances;

                  (j) lease, utility and other similar deposits in the ordinary
         course of business;

                  (k) Investments in securities of trade creditors or customers
         received pursuant to any plan of reorganization or similar arrangement
         upon the bankruptcy or insolvency of such trade creditors or customers;

                  (l) Interest Swap and Hedging Obligations to the extent
         permitted under clause (f) of the definition of "Permitted
         Indebtedness";

                  (m) advances to radiology practice groups made pursuant to
         service agreements in effect on the Issue Date or pursuant to service
         agreements similar to service agreements in effect on the Issue Date in
         the ordinary course of business consistent with past practice;

                                       18
<PAGE>

                  (n) stock, obligations or securities received in settlement of
         debts created in the ordinary course of business and owing to the
         Company or any of its Subsidiaries or in satisfaction of judgments;

                  (o) any Investment made as a result of the receipt of non-cash
         consideration from an Asset Sale that was made pursuant to and in
         compliance with Section 4.14; and

                  (p) any Investment acquired solely in exchange for Qualified
         Capital Stock.

         "Permitted Joint Venture" means any joint venture, partnership or other
Person designated by the Board of Directors of the Company as a Permitted Joint
Venture and (i) at least 20% of whose Voting Equity Interests is at the time
owned (beneficially or directly) by the Company and/or by one or more
Subsidiaries of the Company and if such Permitted Joint Venture is a Subsidiary
of the Company, such Permitted Joint Venture has been designated as an
Unrestricted Subsidiary of the Company in accordance with Section 4.20, and (ii)
is engaged in a Related Business; provided that each of Advanced PET Imaging of
Maryland, L.P., Montgomery Community Magnetic Imaging Center Limited
Partnership, Tower OpenScan MRI, MRI of Kansas, Carroll County, LLC, Franklin
Imaging Joint Venture, Greater Baltimore Diagnostic Imaging Partnership, MRI at
St. Joseph Medical Center, LLC, Health Systems Imaging, LLC, Magnetic Imaging of
Baltimore, Southeast Baptist Imaging Center, Baptist Imaging Center, Northeast
Baptist MRI Center, Lexington MR, Ltd. and North Central Baptist Imaging Center
shall be deemed to be a Permitted Joint Venture as of the Issue Date. Any such
designation (other than with respect to the Persons identified in the preceding
sentence) shall be evidenced to the Trustee by promptly filing with the Trustee
a copy of the resolution giving effect to such designation and an Officers'
Certificate certifying that such designation complied with the foregoing
provisions.

         "Permitted Lien" means:

                  (a) Liens existing on the Issue Date;

                  (b) Liens imposed by governmental authorities for taxes,
         assessments or other charges not yet subject to penalty or which are
         being contested in good faith and by appropriate proceedings, if
         adequate reserves with respect thereto are maintained on the books of
         the Company in accordance with GAAP;

                  (c) statutory liens of carriers, warehousemen, mechanics,
         material men, landlords, repairmen or other like Liens arising by
         operation of law in the ordinary course of business provided that (1)
         the underlying obligations are not overdue for a period of more than 60
         days, or (2) such Liens are being contested in good faith and by
         appropriate proceedings and adequate reserves with respect thereto are
         maintained on the books of the Company in accordance with GAAP;

                                       19
<PAGE>

                  (d) Liens securing the performance of bids, trade contracts
         (other than borrowed money), leases, statutory obligations, surety and
         appeal bonds, performance bonds and other obligations of a like nature
         incurred in the ordinary course of business;

                  (e) easements, rights-of-way, zoning, similar restrictions and
         other similar encumbrances or title defects which, singly or in the
         aggregate, do not in any case materially detract from the value of the
         property, subject thereto (as such property is used by the Company or
         any of its Subsidiaries) or interfere with the ordinary conduct of the
         business of the Company or any of its Subsidiaries;

                  (f) Liens arising by operation of law in connection with
         judgments, only to the extent, for an amount and for a period not
         resulting in an Event of Default with respect thereto;

                  (g) pledges or deposits made in the ordinary course of
         business in connection with workers' compensation, unemployment
         insurance and other types of social security legislation;

                  (h) Liens securing the Notes;

                  (i) Liens securing Indebtedness of a Person existing at the
         time such Person becomes a Subsidiary or is merged with or into the
         Company or a Subsidiary or Liens securing Indebtedness incurred in
         connection with an Acquisition, provided, that such Liens were in
         existence prior to the date of such acquisition, merger or
         consolidation, were not incurred in anticipation thereof, and do not
         extend to any other assets;

                  (j) Liens arising from Purchase Money Indebtedness permitted
         to be incurred pursuant to clause (a) of Section 4.11 provided such
         Liens relate solely to the property which is subject to such Purchase
         Money Indebtedness;

                  (k) leases or subleases granted to other Persons in the
         ordinary course of business not materially interfering with the conduct
         of the business of the Company or any of its Subsidiaries or materially
         detracting from the value of the related assets of the Company or any
         Subsidiary;

                  (l) Liens arising from precautionary Uniform Commercial Code
         financing statement filings regarding operating leases entered into by
         the Company or any of its Subsidiaries in the ordinary course of
         business;

                  (m) Liens securing Refinancing Indebtedness incurred to
         refinance any Indebtedness that was previously so secured, provided
         that the Indebtedness secured is not increased and the Lien is not
         extended to any additional assets or property that would not have been
         security for the Indebtedness refinanced;

                                       20
<PAGE>

                  (n) Liens securing Indebtedness incurred under the Credit
         Agreement in accordance with Section 4.11;

                  (o) Liens in favor of the Company or any Guarantor;

                  (p) Liens upon specific items of inventory or other goods and
         proceeds of any Person securing such Person's obligations in respect of
         bankers' acceptances issued or created for the account of such Person
         to facilitate the purchase, shipment or storage of such inventory or
         other goods;

                  (q) Liens to secure Attributable Indebtedness and that are
         permitted to be incurred pursuant to Section 4.18; provided that any
         such Lien shall not extend to or cover any assets of the Company or any
         Subsidiary other than the assets that are the subject of the sale and
         leaseback transaction in which the Attributable Indebtedness is
         incurred; and

                  (r) Liens incurred in the ordinary course of business of the
         Company or any Subsidiary with respect to obligations (other than
         Indebtedness) that do not in the aggregate exceed $7,000,000 at any one
         time outstanding.

         "Person" or "person" means any corporation, individual, limited
liability company, joint stock company, joint venture, partnership,
unincorporated association, governmental regulatory entity, country, state or
political subdivision thereof, trust, municipality or other entity.

         "Preferred Stock" means any Equity Interest of any class or classes of
a Person (however designated) which is preferred as to payments of dividends, or
as to distributions upon any liquidation or dissolution, over Equity Interests
of any other class of such Person.

         "Private Placement Legend" means the legend set forth in Section
2.6(g)(1) to be placed on all Notes issued under this Indenture except where
specifically stated otherwise by the provisions of this Indenture.

         "principal" of any Indebtedness means the principal of such
Indebtedness.

         "property" means any right or interest in or to property or assets of
any kind whatsoever, whether real, personal or mixed and whether tangible,
intangible, contingent, direct or indirect.

         "Pro Forma" or "pro forma" shall have the meaning set forth in
Regulation S-X of the Securities Act, unless otherwise specifically stated
herein.

         "Public Equity Offering" means an underwritten public offering pursuant
to a registration statement filed with the SEC in accordance with the Securities
Act of 1933, as amended, of Qualified Capital Stock of the Company.

                                       21
<PAGE>

         "Purchase Money Indebtedness" of any Person means any Indebtedness of
such Person to any seller or other Person incurred solely to finance the
acquisition (including in the case of a Capitalized Lease Obligation, the
lease), construction, installation or improvement of any after acquired real or
personal tangible property which is directly related to a Related Business of
the Company and which is incurred within 180 days of such acquisition,
construction, installation or improvement and is secured only by the assets so
financed.

         "QIB" means a "qualified institutional buyer" as defined in Rule 144A.

         "Qualified Capital Stock" means any Capital Stock of the Company that
is not Disqualified Capital Stock.

         "Qualified Exchange" means:

                  (1) any legal defeasance, redemption, retirement, repurchase
         or other acquisition of Capital Stock or Indebtedness of the Company
         with the Net Cash Proceeds received by the Company from the
         substantially concurrent sale of its Qualified Capital Stock (other
         than to a Subsidiary); or

                  (2) any issuance of Qualified Capital Stock of the Company
         solely in exchange for any Capital Stock or Indebtedness of the
         Company.

         "Record Date" means a record date specified in the Notes whether or not
such record date is a Business Day, or, if applicable, as specified in Section
2.12.

         "Redemption Date," when used with respect to any Note to be redeemed,
means the date fixed for such redemption pursuant to Article III of this
Indenture and Section 5 in the form of Note attached hereto as Exhibit A.

         "Redemption Price," when used with respect to any Note to be redeemed,
means the redemption price for such redemption pursuant to Section 5 in the form
of Note attached hereto as Exhibit A, which shall include, without duplication,
in each case, accrued and unpaid interest and Liquidated Damages, if any, to the
Redemption Date.

         "Reference Period" with regard to any Person means the four full fiscal
quarters ended immediately preceding any date upon which any determination is to
be made pursuant to the terms of the Notes or this Indenture.

         "Refinancing Indebtedness" means Indebtedness (including Disqualified
Capital Stock) (a) issued in exchange for, or the proceeds from the issuance and
sale of which are used substantially concurrently to repay, redeem, defease,
refund, refinance, discharge or otherwise retire for value, in whole or in part,
or (b) constituting an amendment, modification or supplement to, or a deferral
or renewal of ((a) and (b) above are, collectively, a "Refinancing"), any
Indebtedness (including Disqualified Capital Stock) in a principal amount or, in
the case of

                                       22
<PAGE>

Disqualified Capital Stock, liquidation preference, not to exceed (after
deduction of reasonable and customary fees and expenses incurred in connection
with the Refinancing plus the amount of any premium paid in connection with such
Refinancing in accordance with the terms of the documents governing the
Indebtedness refinanced without giving effect to any modification thereof made
in connection with or in contemplation of such refinancing) the lesser of (1)
the principal amount or, in the case of Disqualified Capital Stock, liquidation
preference, of the Indebtedness (including Disqualified Capital Stock) so
Refinanced and (2) if such Indebtedness being Refinanced was issued with an
original issue discount, the accreted value thereof (as determined in accordance
with GAAP) at the time of such Refinancing; provided, that (A) such Refinancing
Indebtedness shall only be used to refinance outstanding Indebtedness (including
Disqualified Capital Stock) of such Person issuing such Refinancing
Indebtedness, (B) such Refinancing Indebtedness shall (x) not have an Average
Life shorter than the Indebtedness (including Disqualified Capital Stock) to be
so refinanced at the time of such Refinancing and (y) in all respects, be no
less contractually subordinated or junior, if applicable, to the rights of
Holders of the Notes than was the Indebtedness (including Disqualified Capital
Stock) to be refinanced, (C) such Refinancing Indebtedness shall have a final
stated maturity or redemption date, as applicable, no earlier than the final
stated maturity or redemption date, as applicable, of the Indebtedness
(including Disqualified Capital Stock) to be so refinanced or, if sooner, 91
days after the Stated Maturity of the Notes, and (D) such Refinancing
Indebtedness shall be secured (if secured) in a manner no more adverse to the
Holders of the Notes than the terms of the Liens (if any) securing such
refinanced Indebtedness.

         "Reg S Permanent Global Note" means one or more permanent Global Notes
bearing the Private Placement Legend, that will be issued in an aggregate amount
of denominations equal in total to the outstanding principal amount of the Reg S
Temporary Global Note upon expiration of the Distribution Compliance Period.

         "Reg S Temporary Global Note" means one or more temporary Global Notes
bearing the Private Placement Legend and the Reg S Temporary Global Note Legend,
issued in an aggregate amount of denominations equal in total to the outstanding
principal amount of the Notes initially sold in reliance on Rule 903 of
Regulation S.

         "Reg S Temporary Global Note Legend" means the legend set forth in
Section 2.6(g)(3), which is required to be placed on all Reg S Temporary Global
Notes issued under this Indenture.

         "Registrar" shall have the meaning specified in Section 2.3.

         "Registration Rights Agreement" means the Registration Rights
Agreement, dated as of the Issue Date, by and among the Company and the other
parties named on the signature pages thereof, as such agreement may be amended,
modified or supplemented from time to time.

         "Regulation S" means Regulation S promulgated under the Securities Act,
as it may be amended from time to time, and any successor provision thereto.

                                       23
<PAGE>

         "Regulation S Global Note" means a Reg S Temporary Global Note or a Reg
S Permanent Global Note, as the case may be.

         "Related Business" means the business conducted (or proposed to be
conducted) by the Company and its Subsidiaries as of the Issue Date and any and
all businesses that in the good faith judgment of the Board of Directors of the
Company are materially related businesses.

         "Restricted Definitive Note" means one or more Definitive Notes bearing
the Private Placement Legend, issued under this Indenture.

         "Restricted Global Note" means one or more Global Notes bearing the
Private Placement Legend, issued under this Indenture; provided, that in no case
shall an Exchange Note issued in accordance with this Indenture and the terms of
the Registration Rights Agreement be a Restricted Global Note.

         "Restricted Investment" means, in one or a series of related
transactions, any Investment, other than Permitted Investments.

         "Restricted Note" means a Note, unless or until it has been (i)
effectively registered under the Securities Act and disposed of in accordance
with the registration statement covering it or (ii) distributed to the public
pursuant to Rule 144 (or any similar provision then in force) under the
Securities Act; provided, that in no case shall an Exchange Note issued in
accordance with this Indenture and the terms and provisions of the Registration
Rights Agreement be a Restricted Note.

         "Restricted Payment" means, with respect to any Person:

                  (a) the declaration or payment of any dividend or other
         distribution in respect of Equity Interests of such Person;

                  (b) any payment (except to the extent with Qualified Capital
         Stock) on account of the purchase, redemption or other acquisition or
         retirement for value of Equity Interests of such Person;

                  (c) other than with the proceeds from the substantially
         concurrent sale of, or in exchange for, Refinancing Indebtedness, any
         purchase, redemption, or other acquisition or retirement for value of,
         any payment in respect of any amendment of the terms of or any
         defeasance of, any Subordinated Indebtedness, directly or indirectly,
         by such Person or a Subsidiary of such Person prior to the scheduled
         maturity, any scheduled repayment of principal, or scheduled sinking
         fund payment, as the case may be, of such Subordinated Indebtedness;
         and

                  (d) any Restricted Investment by such Person;

                                       24
<PAGE>

provided, however, that the term "Restricted Payment" does not include (1) any
dividend, distribution or other payment on or with respect to Equity Interests
of an issuer to the extent payable solely in shares of Qualified Capital Stock
of such issuer, or (2) any dividend, distribution or other payment to the
Company, or to any Guarantor, by any Subsidiary of the Company.

         "Rule 144A" means Rule 144A promulgated under the Securities Act, as it
may be amended from time to time, and any successor provision thereto.

         "S&P" means Standard & Poor's, a division of The McGraw-Hill Companies,
and its successors.

         "SEC" means the Securities and Exchange Commission.

         "Securities Act" means the Securities Act of 1933, as amended, and the
rules and regulations of the SEC promulgated thereunder.

         "Securities Custodian" means the Trustee, as custodian with respect to
the Notes in global form, or any successor entity thereto.

         "Securityholder" or "Holder" means the Person in whose name a Note is
registered on the Registrar's books.

         "Shelf Registration Statement" shall have the meaning set forth in the
Registration Rights Agreement.

         "Significant Subsidiary" shall have the meaning provided under
Regulation S-X of the Securities Act, as in effect on the Issue Date.

         "Special Record Date" for payment of any Defaulted Interest means a
date fixed by the Trustee pursuant to Section 2.12.

         "Stated Maturity," when used with respect to any Note, means December
15, 2008.

         "Subordinated Indebtedness" means Indebtedness of the Company or a
Guarantor that is subordinated in right of payment by its terms or the terms of
any document or instrument relating thereto ("contractually") to the Notes or
such Guarantee, as applicable, in any respect.

         "Subsidiary," with respect to any Person, means (1) a corporation a
majority of whose Equity Interests with voting power, under ordinary
circumstances, to elect directors is at the time, directly or indirectly, owned
by such Person, by such Person and one or more Subsidiaries of such Person or by
one or more Subsidiaries of such Person, (2) any other Person (other than a
corporation) in which such Person, one or more Subsidiaries of such Person, or
such Person and one or more Subsidiaries of such Person, directly or indirectly,
at the date of determination

                                       25
<PAGE>
thereof has a majority ownership interest, and (3) any partnership in which such
Person or a Subsidiary of such Person is, at the time, a general partner.
Notwithstanding the foregoing, an Unrestricted Subsidiary shall not be a
Subsidiary of the Company or of any Subsidiary of the Company. Unless the
context requires otherwise, Subsidiary means each direct and indirect Subsidiary
of the Company.

         "TIA" means the Trust Indenture Act of 1939, as amended, (15 U.S. Code
Sections 77aaa-77bbbb) as in effect on the date of the execution of this
Indenture, except as provided in Section 9.3.

         "Transfer Restricted Notes" means Global Notes and Definitive Notes
that bear or are required to bear the Private Placement Legend, issued under
this Indenture.

         "Trustee" means the party named as such in this Indenture until a
successor replaces it in accordance with the provisions of this Indenture and
thereafter means such successor.

         "Trust Officer" means, when used with respect to the Trustee, any
officer within the corporate trust department of the Trustee, including any vice
president, assistant vice president, assistant secretary, assistant treasurer,
trust officer or any other officer of the Trustee who customarily performs
functions similar to those performed by the Persons who at the time shall be
such officers, respectively, or to whom any corporate trust matter is referred
because of such person's knowledge of and familiarity with the particular
subject and who shall have direct responsibility for the administration of this
Indenture.

         "Unrestricted Definitive Note" means one or more Definitive Notes that
do not bear and are not required to bear the Private Placement Legend, issued
under this Indenture.

         "Unrestricted Global Note" means one or more permanent Global Notes
representing a series of Notes that does not bear and is not required to bear
the Private Placement Legend, issued under this Indenture.

         "Unrestricted Subsidiary" means (1) Advanced PET Imaging of Maryland,
L.P., Montgomery Community Magnetic Imaging Center Limited Partnership, Tower
OpenScan MRI, MRI of Kansas, Carroll County, LLC, Franklin Imaging Joint
Venture, Greater Baltimore Diagnostic Imaging Partnership, MRI at St. Joseph
Medical Center, LLC, Health Systems Imaging, LLC, Magnetic Imaging of Baltimore,
Southeast Baptist Imaging Center, Baptist Imaging Center, Northeast Baptist MRI
Center, Lexington MR, Ltd., and North Central Baptist Imaging Center, and (2)
any Subsidiary of the Company that is designated as such in accordance with
Section 4.20.

         "U.S. Government Obligations" means direct non-callable obligations of,
or noncallable obligations guaranteed by, the United States of America for the
payment of which obligation or guarantee the full faith and credit of the United
States of America is pledged.

                                       26
<PAGE>

         "Voting Equity Interests" means Equity Interests which at the time are
entitled to vote in the election of, as applicable, directors, members or
partners generally.

         "Wholly Owned Subsidiary" means a Subsidiary all the Equity Interests
of which (other than directors' qualifying Shares) are owned by the Company or
one or more Wholly Owned Subsidiaries of the Company or a combination thereof.

SECTION 1.2. INCORPORATION BY REFERENCE OF TIA

                  Whenever this Indenture refers to a provision of the TIA, such
provision is incorporated by reference in and made a part of this Indenture. The
following TIA terms used in this Indenture have the following meanings:

                  "Commission" means the SEC.

                  "indenture securities" means the Notes.

                  "indenture securityholder" means a Holder or a Securityholder.

                  "indenture to be qualified" means this Indenture.

                  "indenture trustee" or "institutional trustee" means the
Trustee.

                  "obligor" on the indenture securities means the Company, each
Guarantor and any other obligor on the Notes.

                  All other terms used in this Indenture that are defined by the
TIA, defined by TIA reference to another statute or defined by SEC rule and not
otherwise defined herein have the TIA meanings assigned to them thereby.

SECTION 1.3. RULES OF CONSTRUCTION

                  Unless the context otherwise requires:

                  (1) a term has the meaning assigned to it;

                  (2) an accounting term not otherwise defined has the meaning
         assigned to it in accordance with GAAP;

                  (3) "or" is not exclusive;

                  (4) words in the singular include the plural, and words in the
         plural include the singular;

                                       27
<PAGE>

                  (5) provisions apply to successive events and transactions;

                  (6) "herein," "hereof" and other words of similar import refer
         to this Indenture as a whole and not to any particular Article, Section
         or other subdivision; and

                  (7) references to Sections or Articles means reference to such
         Section or Article in this Indenture, unless stated otherwise.

                                   ARTICLE II

                                 THE SECURITIES

SECTION 2.1. FORM AND DATING

                  (a) General. The Notes and the Trustee's certificate of
authentication shall be substantially in the form of Exhibit A hereto. The Notes
may have notations, legends or endorsements required by law, stock exchange rule
or usage. Each Note shall be dated the date of its authentication. The Notes
shall be in denominations of $1,000 and integral multiples thereof.

                  The terms and provisions contained in the Notes shall
constitute, and are hereby expressly made, a part of this Indenture, and the
Company, the Guarantors and the Trustee, by their execution and delivery of this
Indenture, expressly agree to such terms and provisions and to be bound thereby.
However, to the extent any provision of any Note conflicts with the express
provisions of this Indenture, the provisions of this Indenture shall govern and
be controlling.

                  (b) Global Notes. Notes issued in global form shall be
substantially in the form of Exhibit A attached hereto (including the Global
Note Legend thereon and the "Schedule of Exchanges of Interests in the Global
Note" attached thereto). Notes issued in definitive form shall be substantially
in the form of Exhibit A attached hereto (but without the Global Note Legend
thereon and without the "Schedule of Exchanges of Interests in the Global Note"
attached thereto). Each Global Note shall represent such of the outstanding
Notes as shall be specified therein and each shall provide that it shall
represent the aggregate principal amount of outstanding Notes from time to time
endorsed thereon and that the aggregate principal amount of outstanding Notes
represented thereby may from time to time be reduced or increased, as
appropriate, to reflect exchanges and redemptions. Any endorsement of a Global
Note to reflect the amount of any increase or decrease in the aggregate
principal amount of outstanding Notes represented thereby shall be made by the
Trustee or the Securities Custodian, at the direction of the Trustee, in
accordance with instructions given by the Holder thereof as required by Section
2.6 hereof.

                                       28
<PAGE>

                  (c) Euroclear and Clearstream Procedures Applicable. The
provisions of the "Operating Procedures of the Euroclear System" and "Terms and
Conditions Governing Use of Euroclear" and the "General Terms and Conditions of
Clearstream Banking" and "Customer Handbook" of Clearstream in effect at the
relevant time shall be applicable to transfers of beneficial interests in the
Regulation S Global Notes that are held by Participants through Euroclear or
Clearstream.

SECTION 2.2. EXECUTION AND AUTHENTICATION

                  Two Officers shall sign the Notes for the Company by manual or
facsimile signature. In the case of Definitive Notes, such signatures may be
imprinted or otherwise reproduced on such Notes. If an Officer whose signature
is on a Note no longer holds that office at the time a Note is authenticated,
the Note shall nevertheless be valid. A Note shall not be valid until
authenticated by the manual signature of the Trustee. The signature shall be
conclusive evidence that the Note has been authenticated under this Indenture.
The Trustee shall, upon a written order of the Company signed by an Officer (an
"Authentication Order"), authenticate Notes for issuance up to the aggregate
principal amount stated in such Authentication Order; provided, that Notes
authenticated for issuance on the Issue Date shall not exceed $160,000,000 in
aggregate principal amount. The Trustee may appoint an authenticating agent
acceptable to the Company to authenticate Notes. An authenticating agent may
authenticate Notes whenever the Trustee may do so. Each reference in this
Indenture to authentication by the Trustee includes authentication by such
agent. An authenticating agent has the same rights as an Agent to deal with
Holders or an Affiliate of the Company.

SECTION 2.3. REGISTRAR, PAYING AGENT AND DEPOSITARY

                  The Company shall maintain an office or agency in the Borough
of Manhattan, The City of New York, where Notes may be presented for
registration of transfer or for exchange ("Registrar") and an office or agency
where Notes may be presented for payment ("Paying Agent"). The Registrar shall
keep a register of the Notes and of their transfer and exchange. The Company may
appoint one or more co-registrars and one or more additional paying agents. The
term "Registrar" includes any co-registrar and the term "Paying Agent" includes
any additional paying agent. The Company may change any Paying Agent or
Registrar without notice to any Holder. The Company shall notify the Trustee in
writing of the name and address of any Agent not a party to this Indenture. If
the Company fails to appoint or maintain an entity other than the Trustee as
either Registrar or Paying Agent, the Trustee shall act as such. The Company or
any of its Subsidiaries may act as Paying Agent or Registrar. The Company
initially appoints The Depository Trust Company ("DTC") to act as Depositary
with respect to the Global Notes. The Company initially appoints the Trustee to
act as Registrar and Paying Agent and to act as Notes Custodian with respect to
the Global Notes.

                                       29
<PAGE>

SECTION 2.4. PAYING AGENT TO HOLD MONEY IN TRUST

                  The Company shall require each Paying Agent other than the
Trustee to agree in writing that the Paying Agent will hold in trust for the
benefit of Holders or the Trustee all money held by the Paying Agent for the
payment of principal, premium or Liquidated Damages, if any, or interest on the
Notes and will notify the Trustee of any default by the Company in making any
such payment. While any such default continues, the Trustee may require a Paying
Agent to pay all money held by it to the Trustee. The Company at any time may
require a Paying Agent to pay all money held by it to the Trustee. Upon payment
over to the Trustee, the Paying Agent (if other than the Company or a
Subsidiary) shall have no further liability for the money. If the Company or a
Subsidiary acts as Paying Agent, it shall segregate and hold in a separate trust
fund for the benefit of the Holders all money held by it as Paying Agent. Upon
any bankruptcy or reorganization proceedings relating to the Company, the
Trustee shall serve as Paying Agent for the Notes.

SECTION 2.5. HOLDER LISTS

                  The Trustee shall preserve, in as current a form as is
reasonably practicable, the most recent list available to it of the names and
addresses of all Holders and shall otherwise comply with TIA Section 312(a). If
the Trustee is not the Registrar, the Company shall furnish, or shall cause the
Registrar (if other than the Company) to furnish, to the Trustee at least seven
Business Days before each Interest Payment Date and at such other times as the
Trustee may request in writing, a list in such form and as of such date as the
Trustee may reasonably require of the names and addresses of the Holders of
Notes, and the Company shall otherwise comply with TIA Section 312(a).

SECTION 2.6. TRANSFER AND EXCHANGE

                  (a) Transfer and Exchange of Global Notes. A Global Note may
not be transferred except as a whole by the Depositary to a nominee of the
Depositary, by a nominee of the Depositary to the Depositary or to another
nominee of the Depositary, or by the Depositary or any such nominee to a
successor Depositary or a nominee of such successor Depositary. All Global Notes
will be exchanged by the Company for Definitive Notes if (i) the Company
delivers to the Trustee notice from the Depositary that (x) the Depositary is
unwilling or unable to continue to act as Depositary for the Global Notes and
the Company thereupon fails to appoint a successor Depositary within 90 days or
(y) the Depositary is no longer a clearing agency registered under the Exchange
Act, (ii) the Company, in its sole discretion, determines that the Global Notes
(in whole but not in part) should be exchanged for Definitive Notes and delivers
a written notice to such effect to the Trustee or (iii) upon request of the
Trustee or Holders of a majority of the aggregate principal amount of
outstanding Notes if there shall have occurred and be continuing a Default or
Event of Default with respect to the Notes; provided, that in no event shall the
Reg S Temporary Global Note be exchanged by the Company for Definitive Notes
prior to (x) the expiration of the Distribution Compliance Period and (y) the
receipt by the Registrar of any certificate identified by the Company and its
counsel to be required pursuant to Rule 903 or Rule 904 under the Securities
Act. Upon the occurrence of any of the preceding events in (i), (ii) or (iii)
above, Definitive Notes shall be issued in such names

                                       30
<PAGE>

as the Depositary shall instruct the Trustee. Global Notes also may be exchanged
or replaced, in whole or in part, as provided in Sections 2.7 and 2.10 hereof.
Every Note authenticated and delivered in exchange for, or in lieu of, a Global
Note or any portion thereof, pursuant to this Section 2.6 or Section 2.7 or 2.10
hereof, shall be authenticated and delivered in the form of, and shall be, a
Global Note. A Global Note may not be exchanged for another Note other than as
provided in this Section 2.6(a), however, beneficial interests in a Global Note
may be transferred and exchanged as provided in Section 2.6(b), (c) or (f)
hereof.

                  (b) Transfer and Exchange of Beneficial Interests in the
Global Notes. The transfer and exchange of beneficial interests in the Global
Notes shall be effected through the Depositary, in accordance with the
provisions of this Indenture and the Applicable Procedures. Beneficial interests
in the Restricted Global Notes shall be subject to restrictions on transfer
comparable to those set forth herein to the extent required by the Securities
Act. Transfers of beneficial interests in the Global Notes also shall require
compliance with either subparagraph (1) or (2) below, as applicable, as well as
one or more of the other following subparagraphs, as applicable:

                  (1) Transfer of Beneficial Interests in the Same Global Note.
         Beneficial interests in any Restricted Global Note may be transferred
         to Persons who take delivery thereof in the form of a beneficial
         interest in the same Restricted Global Note in accordance with the
         transfer restrictions set forth in the Private Placement Legend;
         provided, however, that prior to the expiration of the Distribution
         Compliance Period, transfers of beneficial interests in the Reg S
         Temporary Global Note may not be made to a U.S. person (as such term is
         defined in Regulation S) or for the account or benefit of a U.S. person
         (other than an Initial Purchaser). Beneficial interests in any
         Unrestricted Global Note may be transferred to Persons who take
         delivery thereof in the form of a beneficial interest in an
         Unrestricted Global Note. No written orders or instructions shall be
         required to be delivered to the Registrar to effect the transfers
         described in this Section 2.6(b)(1), but the Company or the Trustee may
         request an opinion of counsel.

                  (2) All Other Transfers and Exchanges of Beneficial Interests
         in Global Notes (including for Definitive Notes). In connection with
         all transfers and exchanges of beneficial interests that are not
         subject to Section 2.6(b)(1) above, the transferor of such beneficial
         interest must deliver to the Registrar either (A) (1) an order from a
         Participant or an Indirect Participant given to the Depositary in
         accordance with the Applicable Procedures directing the Depositary to
         credit or cause to be credited a beneficial interest in another Global
         Note in an amount equal to the beneficial interest to be transferred or
         exchanged and (2) instructions given in accordance with the Applicable
         Procedures containing information regarding the Participant account to
         be credited with such increase or (B) (1) an order from a Participant
         or an Indirect Participant given to the Depositary in accordance with
         the Applicable Procedures directing the Depositary to cause to be
         issued a Definitive Note in an amount equal to the beneficial interest
         to be transferred or exchanged and (2) instructions given by the

                                       31
<PAGE>

         Depositary to the Registrar containing information regarding the Person
         in whose name such Definitive Note shall be registered to effect the
         transfer or exchange referred to in (B)(1) above; provided, that in no
         event shall Definitive Notes be issued upon the transfer or exchange of
         beneficial interests in the Reg S Temporary Global Note prior to (x)
         the expiration of the Distribution Compliance Period and (y) the
         receipt by the Registrar of any certificates identified by the Company
         or its counsel to be required pursuant to Rule 903 and Rule 904 under
         the Securities Act. Upon consummation of an Exchange Offer by the
         Company in accordance with Section 2.6(f) hereof, the requirements of
         this Section 2.6(b)(2) shall be deemed to have been satisfied upon
         receipt by the Registrar of the instructions contained in the Letter of
         Transmittal delivered by the Holder of such beneficial interests in the
         Restricted Global Notes. Upon satisfaction of all of the requirements
         for transfer or exchange of beneficial interests in Global Notes
         contained in this Indenture and the Notes or otherwise applicable under
         the Securities Act, the Trustee shall adjust the principal amount of
         the relevant Global Note(s) pursuant to Section 2.6(h) hereof.

                  (3) Transfer of Beneficial Interests to Another Restricted
         Global Note. A beneficial interest in any Restricted Global Note may be
         transferred to a Person who takes delivery thereof in the form of a
         beneficial interest in another Restricted Global Note if the transfer
         complies with the requirements of Section 2.6(b)(2) above and the
         Registrar receives the following:

                                    (A) if the transferee will take delivery in
                  the form of a beneficial interest in the 144A Global Note,
                  then the transferor must deliver a certificate in the form of
                  Exhibit B hereto, including the certifications in item (1)
                  thereof;

                                    (B) if the transferee will take delivery in
                  the form of a beneficial interest in the 501 Global Note, then
                  the transferor must deliver a certificate in the form of
                  Exhibit B hereto, including the certifications in item (3)(d)
                  thereof; or

                                    (C) if the transferee will take delivery in
                  the form of a beneficial interest in the Reg S Temporary
                  Global Note or the Reg S Permanent Global Note, then the
                  transferor must deliver a certificate in the form of Exhibit B
                  hereto, including the certifications in item (2) thereof.

                  (4) Transfer and Exchange of Beneficial Interests in a
         Restricted Global Note for Beneficial Interests in an Unrestricted
         Global Note. A beneficial interest in any Restricted Global Note may be
         exchanged by any holder thereof for a beneficial interest in an
         Unrestricted Global Note or transferred to a Person who takes delivery
         thereof in the form of a beneficial interest in an Unrestricted Global
         Note if the exchange or transfer complies with the requirements of
         Section 2.6(b)(2) above and:

                                       32
<PAGE>
                                    (A) such exchange or transfer is effected
                  pursuant to the Exchange Offer in accordance with the
                  Registration Rights Agreement and Section 2.6(f) hereof, and
                  the holder of the beneficial interest to be transferred, in
                  the case of an exchange, or the transferee, in the case of a
                  transfer, certifies in the applicable Letter of Transmittal
                  that it is not (1) a Broker-Dealer, (2) a Person participating
                  in the distribution of the Exchange Notes or (3) a Person who
                  is an affiliate (as defined in Rule 144) of the Company;

                                    (B) such transfer is effected pursuant to
                  the Shelf Registration Statement in accordance with the
                  Registration Rights Agreement and a certificate to the effect
                  set forth in Exhibit B hereto, including the certifications in
                  item (3)(c) thereof, is delivered by the transferor;

                                    (C) such transfer is effected by a
                  Broker-Dealer pursuant to the Exchange Offer Registration
                  Statement in accordance with the Registration Rights Agreement
                  and a certificate to the effect set forth in Exhibit B hereto,
                  including the certifications in item (3)(c) thereof, is
                  delivered by the transferor; or

                                    (D) the Registrar receives the following:
                  (1) if the holder of such beneficial interest in a Restricted
                  Global Note proposes to exchange such beneficial interest for
                  a beneficial interest in an Unrestricted Global Note, a
                  certificate from such holder in the form of Exhibit C hereto,
                  including the certifications in item (1)(a) thereof; or (2) if
                  the holder of such beneficial interest in a Restricted Global
                  Note proposes to transfer such beneficial interest to a Person
                  who shall take delivery thereof in the form of a beneficial
                  interest in an Unrestricted Global Note, a certificate from
                  such holder in the form of Exhibit B hereto, including the
                  certifications in item (4) thereof; and, in each such case set
                  forth in this subparagraph (D), an Opinion of Counsel in form,
                  and from legal counsel, reasonably acceptable to the Registrar
                  and the Company to the effect that such exchange or transfer
                  is in compliance with the Securities Act and that the
                  restrictions on transfer contained herein and in the Private
                  Placement Legend are no longer required in order to maintain
                  compliance with the Securities Act.

                  If any such transfer is effected pursuant to subparagraph (B)
or (D) above at a time when an Unrestricted Global Note has not yet been issued,
the Company shall issue and,

                                       33
<PAGE>

upon receipt of an Authentication Order in accordance with Section 2.2 hereof,
the Trustee shall authenticate one or more Unrestricted Global Notes in an
aggregate principal amount equal to the aggregate principal amount of beneficial
interests transferred pursuant to subparagraph (B) or (D) above. Beneficial
interests in an Unrestricted Global Note cannot be exchanged for, or transferred
to Persons who take delivery thereof in the form of, a beneficial interest in a
Restricted Global Note.

                  (c) Transfer and Exchange of Beneficial Interests for
Definitive Notes. Transfer and exchange of beneficial interests in the Global
Notes for Definitive Notes shall be made subject to compliance with this Section
2.6(c), and the requesting Holder shall provide any certifications, documents
and information, as applicable, required pursuant to the following provisions of
this Section 2.6(c). Upon receipt of such applicable documentation, the Trustee
shall cause the aggregate principal amount of the applicable Restricted Global
Note or Unrestricted Global Note, as applicable, to be reduced accordingly
pursuant to Section 2.6 (h) hereof, and the Company shall execute and, upon
receipt of an Authentication Order pursuant to Section 2.2, the Trustee shall
authenticate and deliver to the Person designated in the instructions a
Restricted Definitive Note or an Unrestricted Definitive Note, as applicable, in
the appropriate principal amount. Any Definitive Note issued in exchange for a
beneficial interest in a Global Note pursuant to this Section 2.6(c) shall be
registered in such name or names and in such authorized denomination or
denominations as the Holder of such beneficial interest shall instruct the
Registrar through instructions from the Depositary and the Participant or
Indirect Participant. The Trustee shall deliver such Definitive Notes to the
Persons in whose names such Definitive Notes are so registered.

                  (1) Beneficial Interests in Restricted Global Notes to
         Restricted Definitive Notes. If any holder of a beneficial interest in
         a Restricted Global Note proposes to exchange such beneficial interest
         for a Restricted Definitive Note or to transfer such beneficial
         interest to a Person who takes delivery thereof in the form of a
         Restricted Definitive Note, then, upon receipt by the Registrar of the
         following documentation:

                                    (A) if the holder of such beneficial
                  interest in a Restricted Global Note proposes to exchange such
                  beneficial interest for a Restricted Definitive Note, a
                  certificate from such holder in the form of Exhibit C hereto,
                  including the certifications in item (2)(a) thereof;

                                    (B) if such beneficial interest is being
                  transferred to a QIB in accordance with Rule 144A under the
                  Securities Act, a certificate to the effect set forth in
                  Exhibit B hereto, including the certifications in item (1)
                  thereof;

                                    (C) if such beneficial interest is being
                  transferred to a Non-U.S. Person (as such term is defined in
                  Regulation S) in an offshore transaction in accordance with
                  Rule 903 or Rule

                                       34
<PAGE>

                  904 under the Securities Act, a certificate to the effect set
                  forth in Exhibit B hereto, including the certifications in
                  item (2) thereof;

                                    (D) if such beneficial interest is being
                  transferred to an Institutional Accredited Investor in
                  reliance on an exemption from the registration requirements of
                  the Securities Act other than those listed in subparagraphs
                  (B) and (C) above, a certificate to the effect set forth in
                  Exhibit B hereto, including the certifications, certificates
                  and Opinion of Counsel required by item (3)(d) thereof, if
                  applicable; or

                                    (E) if such beneficial interest is being
                  transferred to the Company or any of its Subsidiaries, a
                  certificate to the effect set forth in Exhibit B hereto,
                  including the certifications in item (3)(b) thereof.

Any Restricted Definitive Note issued in exchange for a beneficial interest in a
Restricted Global Note pursuant to this Section 2.6(c)(1) shall bear the Private
Placement Legend and shall be subject to all restrictions on transfer contained
therein.

                  (2) Beneficial Interests in Restricted Global Notes to
         Unrestricted Definitive Notes. A holder of a beneficial interest in a
         Restricted Global Note may exchange such beneficial interest for an
         Unrestricted Definitive Note or may transfer such beneficial interest
         to a Person who takes delivery thereof in the form of an Unrestricted
         Definitive Note only if:

                                    (A) such exchange or transfer is effected
                  pursuant to the Exchange Offer in accordance with the
                  Registration Rights Agreement and Section 2.6(f) hereof, and
                  the holder of such beneficial interest, in the case of an
                  exchange, or the transferee, in the case of a transfer,
                  certifies in the applicable Letter of Transmittal that it is
                  not (1) a Broker-Dealer, (2) a Person participating in the
                  distribution of the Exchange Notes or (3) a Person who is an
                  affiliate (as defined in Rule 144) of the Company;

                                    (B) such transfer is effected pursuant to
                  the Shelf Registration Statement in accordance with the
                  Registration Rights Agreement and a certificate to the effect
                  set forth in Exhibit B hereto, including the certifications in
                  item (3)(c) thereof, is delivered by the transferor;

                                       35
<PAGE>

                                    (C) such transfer is effected by a
                  Broker-Dealer pursuant to the Exchange Offer Registration
                  Statement in accordance with the Registration Rights Agreement
                  and a certificate to the effect set forth in Exhibit B hereto,
                  including the certifications in item (3)(c) thereof, is
                  delivered by the transferor; or

                                    (D) the Registrar receives the following:
                  (1) if the holder of such beneficial interest in a Restricted
                  Global Note proposes to exchange such beneficial interest for
                  an Unrestricted Definitive Note, a certificate from such
                  holder in the form of Exhibit C hereto, including the
                  certifications in item (1)(b) thereof; or (2) if the holder of
                  such beneficial interest in a Restricted Global Note proposes
                  to transfer such beneficial interest to a Person who shall
                  take delivery thereof in the form of an Unrestricted
                  Definitive Note, a certificate from such holder in the form of
                  Exhibit B hereto, including the certifications in item (4)
                  thereof; and, in each such case set forth in this subparagraph
                  (D), an Opinion of Counsel in form, and from legal counsel,
                  reasonably acceptable to the Registrar and the Company to the
                  effect that such exchange or transfer is in compliance with
                  the Securities Act and that the restrictions on transfer
                  contained herein and in the Private Placement Legend are no
                  longer required in order to maintain compliance with the
                  Securities Act.

Beneficial interests in an Unrestricted Global Note cannot be exchanged for, or
transferred to Persons who take delivery thereof in the form of, a Restricted
Definitive Note.

                  (3) Beneficial Interests in Unrestricted Global Notes to
         Unrestricted Definitive Notes. If any holder of a beneficial interest
         in an Unrestricted Global Note proposes to exchange such beneficial
         interest for an Unrestricted Definitive Note or to transfer such
         beneficial interest to a Person who takes delivery thereof in the form
         of an Unrestricted Definitive Note, then such holder shall satisfy the
         applicable conditions set forth in Section 2.6(b)(2) hereof. Any
         Unrestricted Definitive Note issued in exchange for a beneficial
         interest pursuant to this Section 2.6(c)(3) shall not bear the Private
         Placement Legend.

                  (4) Transfer or Exchange of Reg S Temporary Global Notes.
         Notwithstanding the other provisions of this Section 2.6, a beneficial
         interest in the Reg S Temporary Global Note may not be (A) exchanged
         for a Definitive Note prior to (x) the expiration of the Distribution
         Compliance Period (unless such exchange is approved by the Company,
         does not require an investment decision on the part of the Holder
         thereof and does not violate the provisions of Regulation S) and (y)
         the receipt by the Registrar of any certificates identified by the
         Company or its counsel to be required

                                       36
<PAGE>

         pursuant to Rule 903(b)(3)(ii)(B) under the Securities Act or (B)
         transferred to a Person who takes delivery thereof in the form of a
         Definitive Note prior to the events set forth in clause (A) above or
         unless the transfer is pursuant to an exemption from the registration
         requirements of the Securities Act other than Rule 903 or Rule 904.

                  (d) Transfer and Exchange of Definitive Notes for Beneficial
Interests. Transfer and exchange of Definitive Notes for beneficial interests in
the Global Notes shall be made subject to compliance with this Section 2.6(d),
and the requesting Holder shall provide any certifications, documents and
information, as applicable, required pursuant to the following provisions of
this Section 2.6(d). Upon receipt from such Holder of such applicable
documentation and the surrender to the Registrar of the Definitive Notes duly
endorsed or accompanied by a written instruction of transfer in form
satisfactory to the Registrar, duly executed by such Holder or by its attorney,
duly authorized in writing, the Registrar shall register the transfer or
exchange of the Definitive Notes. The Trustee shall cancel such Definitive Notes
so surrendered and cause the aggregate principal amount of the applicable
Restricted Global Note or Unrestricted Global Note, as applicable, to be
increased accordingly pursuant to Section 2.6(h) hereof.

                  (1) Restricted Definitive Notes to Beneficial Interests in
         Restricted Global Notes. If any Holder of a Restricted Definitive Note
         proposes to exchange such Note for a beneficial interest in a
         Restricted Global Note or to transfer such Restricted Definitive Notes
         to a Person who takes delivery thereof in the form of a beneficial
         interest in a Restricted Global Note, then, upon receipt by the
         Registrar of the following documentation:

                                    (A) if the Holder of such Restricted
                  Definitive Note proposes to exchange such Note for a
                  beneficial interest in a Restricted Global Note, a certificate
                  from such Holder in the form of Exhibit C hereto, including
                  the certifications in item (2)(b) thereof;

                                    (B) if such Restricted Definitive Note is
                  being transferred to a QIB in accordance with Rule 144A under
                  the Securities Act, a certificate to the effect set forth in
                  Exhibit B hereto, including the certifications in item (1)
                  thereof;

                                    (C) if such Restricted Definitive Note is
                  being transferred to a Non-U.S. Person in an offshore
                  transaction in accordance with Rule 903 or Rule 904 under the
                  Securities Act, a certificate to the effect set forth in
                  Exhibit B hereto, including the certifications in item (2)
                  thereof; or

                                    (D) if such Restricted Definitive Note is
                  being transferred to an Institutional Accredited Investor in
                  accordance

                                       37
<PAGE>

                  with Regulation D under the Securities Act, a certificate to
                  the effect set forth in Exhibit B hereto, including the
                  certifications in item (3)(d) thereof;

the Trustee shall cancel the Restricted Definitive Note and increase or cause to
be increased the aggregate principal amount of, in the case of clause (A) above,
the appropriate Restricted Global Note, in the case of clause (B) above, the
144A Global Note, in the case of clause (C) above, the Regulation S Global Note
and in the case of clause (D) above, the 501 Global Note.

                  (2) Restricted Definitive Notes to Beneficial Interests in
         Unrestricted Global Notes. A Holder of a Restricted Definitive Note may
         exchange such Note for a beneficial interest in an Unrestricted Global
         Note or transfer such Restricted Definitive Note to a Person who takes
         delivery thereof in the form of a beneficial interest in an
         Unrestricted Global Note only if:

                                    (A) such exchange or transfer is effected
                  pursuant to the Exchange Offer in accordance with the
                  Registration Rights Agreement and Section 2.6(f) hereof, and
                  the Holder, in the case of an exchange, or the transferee, in
                  the case of a transfer, certifies in the applicable Letter of
                  Transmittal that it is not (1) a Broker-Dealer, (2) a Person
                  participating in the distribution of the Exchange Notes or (3)
                  a Person who is an affiliate (as defined in Rule 144) of the
                  Company;

                                    (B) such transfer is effected pursuant to
                  the Shelf Registration Statement in accordance with the
                  Registration Rights Agreement and a certificate to the effect
                  set forth in Exhibit B hereto, including the certifications in
                  item (3)(c) thereof, is delivered by the transferor;

                                    (C) such transfer is effected by a
                  Broker-Dealer pursuant to the Exchange Offer Registration
                  Statement in accordance with the Registration Rights Agreement
                  and a certificate to the effect set forth in Exhibit B hereto,
                  including the certifications in item (3)(c) thereof, is
                  delivered by the transferor; or

                                    (D) the Registrar receives the following:
                  (1) if the Holder of such Restricted Definitive Notes proposes
                  to exchange such Notes for a beneficial interest in the
                  Unrestricted Global Note, a certificate from such Holder in
                  the form of Exhibit C hereto, including the certifications in
                  item (1)(c) thereof; or (2) if the Holder of such Restricted
                  Definitive Notes proposes to transfer such Notes to a Person
                  who shall take delivery thereof

                                       38
<PAGE>

                  in the form of a beneficial interest in the Unrestricted
                  Global Note, a certificate from such Holder in the form of
                  Exhibit B hereto, including the certifications in item (4)
                  thereof; and, in each such case set forth in this subparagraph
                  (D), an Opinion of Counsel in form, and from legal counsel,
                  reasonably acceptable to the Registrar and the Company to the
                  effect that such exchange or transfer is in compliance with
                  the Securities Act and that the restrictions on transfer
                  contained herein and in the Private Placement Legend are no
                  longer required in order to maintain compliance with the
                  Securities Act.

                  (3) Unrestricted Definitive Notes to Beneficial Interests in
         Unrestricted Global Notes. A Holder of an Unrestricted Definitive Note
         may exchange such Note for a beneficial interest in an Unrestricted
         Global Note or transfer such Definitive Notes to a Person who takes
         delivery thereof in the form of a beneficial interest in an
         Unrestricted Global Note at any time.

If any such exchange or transfer from a Definitive Note to a beneficial interest
is effected pursuant to subparagraphs (2)(B), (2)(D) or (3) of this Section
2.6(d) at a time when an Unrestricted Global Note has not yet been issued, the
Company shall issue and, upon receipt of an Authentication Order in accordance
with Section 2.2 hereof, the Trustee shall authenticate one or more Unrestricted
Global Notes in an aggregate principal amount equal to the principal amount of
Definitive Notes so transferred.

                  (e) Transfer and Exchange of Definitive Notes for Definitive
Notes. Upon request by a Holder of Definitive Notes and such Holder's compliance
with the provisions of this Section 2.6(e), the Registrar shall register the
transfer or exchange of Definitive Notes. Prior to such registration of transfer
or exchange, the requesting Holder shall present or surrender to the Registrar
the Definitive Notes duly endorsed or accompanied by a written instruction of
transfer in form satisfactory to the Registrar duly executed by such Holder or
by its attorney, duly authorized in writing. The Trustee shall cancel any such
Definitive Notes so surrendered, and the Company shall execute and, upon receipt
of an Authentication Order pursuant to Section 2.2, the Trustee shall
authenticate and deliver to the Person designated in the instructions a
Restricted Definitive Note or an Unrestricted Definitive Note, as applicable, in
the appropriate principal amount. Any Definitive Note issued pursuant to this
Section 2.6(c) shall be registered in such name or names and in such authorized
denomination or denominations as the Holder of such beneficial interest shall
instruct the Registrar through instructions from the Depositary and the
Participant or Indirect Participant. The Trustee shall deliver such Definitive
Notes to the Persons in whose names such Definitive Notes are so registered. In
addition, the requesting Holder shall provide any additional certifications,
documents and information, as applicable, required pursuant to the following
provisions of this Section 2.6(e).

                                       39
<PAGE>

                  (1) Restricted Definitive Notes to Restricted Definitive
         Notes. Any Restricted Definitive Note may be transferred to and
         registered in the name of Persons who take delivery thereof in the form
         of a Restricted Definitive Note if the Registrar receives the
         following:

                                    (A) if the transfer will be made to a QIB
                  pursuant to Rule 144A under the Securities Act, then the
                  transferor must deliver a certificate in the form of Exhibit B
                  hereto, including the certifications in item (1) thereof;

                                    (B) if the transfer will be made pursuant to
                  Rule 903 or Rule 904, then the transferor must deliver a
                  certificate in the form of Exhibit B hereto, including the
                  certifications in item (2) thereof;

                                    (C) if such beneficial interest is being
                  transferred to an Institutional Accredited Investor in
                  reliance on an exemption from the registration requirements of
                  the Securities Act other than those listed in subparagraphs
                  (A) and (B) above, then the transferor must deliver a
                  certificate to the effect set forth in Exhibit B hereto,
                  including the certifications, certificates and Opinion of
                  Counsel required by item (3)(d) thereof, if applicable; or

                                    (D) if such beneficial interest is being
                  transferred to the Company or any of its Subsidiaries, a
                  certificate to the effect set forth in Exhibit B hereto,
                  including the certifications in item (3)(b) thereof, must be
                  delivered by the transferor.

                  (2) Restricted Definitive Notes to Unrestricted Definitive
         Notes. Any Restricted Definitive Note may be exchanged by the Holder
         thereof for an Unrestricted Definitive Note or transferred to a Person
         or Persons who take delivery thereof in the form of an Unrestricted
         Definitive Note if:

                                    (A) such exchange or transfer is effected
                  pursuant to the Exchange Offer in accordance with the
                  Registration Rights Agreement and Section 2.6(f) hereof, and
                  the Holder, in the case of an exchange, or the transferee, in
                  the case of a transfer, certifies in the applicable Letter of
                  Transmittal that it is not (1) a Broker-Dealer, (2) a Person
                  participating in the distribution of the Exchange Notes or (3)
                  a Person who is an affiliate (as defined in Rule 144) of the
                  Company;

                                       40
<PAGE>

                                    (B) any such transfer is effected pursuant
                  to the Shelf Registration Statement in accordance with the
                  Registration Rights Agreement and a certificate to the effect
                  set forth in Exhibit B hereto, including the certifications in
                  item (3)(c) thereof, is delivered by the transferor;

                                    (C) any such transfer is effected by a
                  Broker-Dealer pursuant to the Exchange Offer Registration
                  Statement in accordance with the Registration Rights Agreement
                  and a certificate to the effect set forth in Exhibit B hereto,
                  including the certifications in item (3)(c) thereof, is
                  delivered by the transferor; or

                                    (D) the Registrar receives the following:
                  (1) if the Holder of such Restricted Definitive Notes proposes
                  to exchange such Notes for an Unrestricted Definitive Note, a
                  certificate from such Holder in the form of Exhibit C hereto,
                  including the certifications in item (1)(d) thereof; or (2) if
                  the Holder of such Restricted Definitive Notes proposes to
                  transfer such Notes to a Person who shall take delivery
                  thereof in the form of an Unrestricted Definitive Note, a
                  certificate from such Holder in the form of Exhibit B hereto,
                  including the certifications in item (4) thereof; and, in each
                  such case set forth in this subparagraph (D), an Opinion of
                  Counsel in form, and from legal counsel, reasonably acceptable
                  to the Registrar and the Company to the effect that such
                  exchange or transfer is in compliance with the Securities Act
                  and that the restrictions on transfer contained herein and in
                  the Private Placement Legend are no longer required in order
                  to maintain compliance with the Securities Act.

                  (3) Unrestricted Definitive Notes to Unrestricted Definitive
         Notes. A Holder of Unrestricted Definitive Notes may transfer such
         Notes to a Person who takes delivery thereof in the form of an
         Unrestricted Definitive Note. Upon receipt of a request to register
         such a transfer, the Registrar shall register the Unrestricted
         Definitive Notes pursuant to the instructions from the Holder thereof.

                  (f) Exchange Offer. Upon the occurrence of the Exchange Offer
in accordance with the Registration Rights Agreement, the Company shall issue
and, upon receipt of an Authentication Order in accordance with Section 2.2 and
an Opinion of Counsel for the Company as to certain matters discussed in this
Section 2.6(f), the Trustee shall authenticate (i) one or more Unrestricted
Global Notes in an aggregate principal amount equal to the sum of (A) the
principal amount of the beneficial interests in the Restricted Global Notes
exchanged or transferred for beneficial interests in Unrestricted Global Notes
in connection with the Exchange Offer pursuant to Section 2.6(b)(4) and (B) the
principal amount of Restricted Definitive Notes

                                       41
<PAGE>

exchanged or transferred for beneficial interests in Unrestricted Global Notes
in connection with the Exchange Offer pursuant to Section 2.6(d)(2), in each
case tendered for acceptance by Persons that certify in the applicable Letters
of Transmittal that (x) they are not Broker-Dealers, (y) they are not
participating in a distribution of the Exchange Notes and (z) they are not
affiliates (as defined in Rule 144) of the Company, and accepted for exchange in
the Exchange Offer, and (ii) Unrestricted Definitive Notes in an aggregate
principal amount equal to the sum of (A) the principal amount of the Restricted
Definitive Notes exchanged or transferred for Unrestricted Definitive Notes in
connection with the Exchange Offer pursuant to Section 2.6(e)(2) and (B)
Restricted Global Notes exchanged or transferred for Unrestricted Definitive
Notes in connection with the Exchange Offer pursuant to Section 2.6(c)(2), in
each case tendered for acceptance by Persons that certify in the applicable
Letters of Transmittal that (x) they are not Broker-Dealers, (y) they are not
participating in a distribution of the Exchange Notes and (z) they are not
affiliates (as defined in Rule 144) of the Company, and accepted for exchange in
the Exchange Offer. Concurrently with the issuance of such Notes, the Trustee
shall cancel any Definitive Notes so surrendered and shall cause the aggregate
principal amount of the applicable Restricted Global Notes to be reduced
accordingly, and the Company shall execute and, upon receipt of an
Authentication Order pursuant to Section 2.2, the Trustee shall authenticate and
deliver to the Persons designated by the Holders of Definitive Notes so accepted
Definitive Notes in the appropriate principal amount.

                  The Opinion of Counsel for the Company referenced above shall
state that:

                                    (A) the issuance and sale of the Exchange
                  Notes by the Company have been duly authorized and, when
                  executed by the Company and authenticated by the Trustee in
                  accordance with the provisions of this Indenture and delivered
                  in exchange for Series A Notes in accordance with this
                  Indenture and the Exchange Offer, the Exchange Notes will be
                  entitled to the benefits of this Indenture and will be valid
                  and binding obligations of the Company, enforceable against
                  the Company in accordance with their terms, except as the
                  enforceability thereof may be limited by (x) bankruptcy,
                  fraudulent transfer, insolvency, reorganization, moratorium or
                  similar laws now or hereafter in effect relating to or
                  affecting creditors' rights generally and (y) principles of
                  equity (regardless of whether enforceability is considered in
                  equity or at law); and

                                    (B) when the Exchange Notes are issued and
                  executed by the Company and authenticated by the Trustee in
                  accordance with the provisions of this Indenture and delivered
                  in exchange for Series A Notes in accordance with this
                  Indenture and the Exchange Offer, the Guarantees by the
                  Guarantors endorsed thereon will be entitled to the benefits
                  of this Indenture and will be the valid and binding
                  obligations of the Guarantors,

                                       42
<PAGE>

                  enforceable against the Guarantors in accordance with their
                  terms, except as the enforceability thereof may be limited by
                  (x) bankruptcy, fraudulent transfer, insolvency,
                  reorganization, moratorium or similar laws now or hereafter in
                  effect relating to or affecting creditors' rights generally
                  and (y) principles of equity (regardless of whether
                  enforceability is considered in equity or at law).

                  (g) Legends. The following legends shall appear on the face of
all Global Notes and Definitive Notes issued under this Indenture unless
specifically stated otherwise in the applicable provisions of this Indenture.

                  (1) Private Placement Legend.

                                    (A) Except as permitted by subparagraph (B)
                  below, each Global Note and each Definitive Note (and all
                  Notes issued in exchange therefor or substitution thereof)
                  shall bear the legend in substantially the following form:

         THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933,
         AS AMENDED (THE "SECURITIES ACT"), OR ANY STATE SECURITIES LAWS.
         NEITHER THIS SECURITY NOR ANY INTEREST OR PARTICIPATION HEREIN MAY BE
         REOFFERED, SOLD, ASSIGNED, TRANSFERRED, PLEDGED, ENCUMBERED OR
         OTHERWISE DISPOSED OF IN THE ABSENCE OF SUCH REGISTRATION OR UNLESS
         SUCH TRANSACTION IS EXEMPT FROM, OR NOT SUBJECT TO, REGISTRATION. THE
         HOLDER OF THIS SECURITY BY ITS ACCEPTANCE HEREOF AGREES TO OFFER, SELL
         OR OTHERWISE TRANSFER THIS SECURITY PRIOR TO THE DATE WHICH IS TWO
         YEARS (OR SUCH OTHER PERIOD THAT MAY HEREAFTER BE PROVIDED UNDER RULE
         144(k) UNDER THE SECURITIES ACT AS PERMITTING RESALES OF RESTRICTED
         SECURITIES BY NON-AFFILIATES WITHOUT RESTRICTION) AFTER THE LATER OF
         THE ORIGINAL ISSUE DATE HEREOF AND THE LAST DATE ON WHICH THE ISSUER OR
         ANY AFFILIATE OF THE ISSUER WAS THE OWNER OF THIS SECURITY (OR ANY
         PREDECESSOR OF THIS SECURITY) (THE "RESALE RESTRICTION TERMINATION
         DATE") ONLY (A) TO THE ISSUER, (B) PURSUANT TO A REGISTRATION STATEMENT
         WHICH HAS BEEN DECLARED EFFECTIVE UNDER THE SECURITIES ACT, (C) FOR SO
         LONG AS THIS SECURITY IS ELIGIBLE FOR RESALE PURSUANT TO RULE 144A
         UNDER THE SECURITIES ACT, IN THE UNITED STATES TO A PERSON IT
         REASONABLY BELIEVES IS A "QUALIFIED INSTITUTIONAL BUYER" (AS DEFINED IN
         RULE 144A UNDER THE SECURITIES ACT) THAT PURCHASES FOR ITS OWN ACCOUNT
         OR FOR THE ACCOUNT OF A QUALIFIED INSTITUTIONAL BUYER TO WHOM NOTICE IS
         GIVEN THAT THE TRANSFER IS BEING MADE IN RELIANCE ON RULE

                                       43
<PAGE>

         144A UNDER THE SECURITIES ACT, (D) OUTSIDE THE UNITED STATES IN AN
         OFFSHORE TRANSACTION IN ACCORDANCE WITH RULE 904 UNDER THE SECURITIES
         ACT, (E) TO AN INSTITUTIONAL "ACCREDITED INVESTOR" WITHIN THE MEANING
         OF SUBPARAGRAPH (a)(1), (2), (3) OR (7) OF RULE 501 UNDER THE
         SECURITIES ACT THAT IS ACQUIRING THIS SECURITY FOR ITS OWN ACCOUNT, OR
         FOR THE ACCOUNT OF SUCH AN INSTITUTIONAL "ACCREDITED INVESTOR," FOR
         INVESTMENT PURPOSES AND NOT WITH A VIEW TO, OR FOR OFFER OR SALE IN
         CONNECTION WITH, ANY DISTRIBUTION IN VIOLATION OF THE SECURITIES ACT OR
         (F) PURSUANT TO ANOTHER AVAILABLE EXEMPTION FROM THE REGISTRATION
         REQUIREMENTS OF THE SECURITIES ACT, SUBJECT TO THE ISSUER'S AND THE
         TRUSTEE'S RIGHT PRIOR TO ANY SUCH OFFER, SALE OR TRANSFER TO REQUIRE
         THE DELIVERY OF AN OPINION OF COUNSEL, CERTIFICATIONS AND/OR OTHER
         INFORMATION SATISFACTORY TO EACH OF THEM AND IN EACH OF THE FOREGOING
         CASES A CERTIFICATE OF TRANSFER IN THE FORM APPEARING ON THIS SECURITY
         IS COMPLETED AND DELIVERED BY THE TRANSFEROR TO THE TRUSTEE AND IN EACH
         CASE IN ACCORDANCE WITH APPLICABLE SECURITIES LAWS OF ANY U.S. STATE OR
         ANY OTHER APPLICABLE JURISDICTION. THE HOLDER OF THIS SECURITY AGREES
         THAT IT WILL DELIVER TO EACH PERSON TO WHOM THIS SECURITY IS
         TRANSFERRED A NOTICE SUBSTANTIALLY TO THE EFFECT OF THIS LEGEND. THIS
         LEGEND WILL BE REMOVED UPON THE REQUEST OF THE HOLDER AFTER THE RESALE
         RESTRICTION TERMINATION DATE.

                                    (B) Notwithstanding the foregoing, any
                  Global Note or Definitive Note issued pursuant to
                  subparagraphs (b)(4), (c)(2), (c)(3), (d)(2), (d)(3), (e)(2),
                  (e)(3) or (f) to this Section 2.6 (and all Notes issued in
                  exchange therefor or substitution thereof) shall not bear the
                  Private Placement Legend.

                           (2) Global Note Legend. To the extent required by the
         Depositary, each Global Note shall bear legends in substantially the
         following forms:

         "THIS GLOBAL NOTE IS HELD BY THE DEPOSITARY (AS DEFINED IN THE
         INDENTURE GOVERNING THIS NOTE) OR ITS NOMINEE IN CUSTODY FOR THE
         BENEFIT OF THE BENEFICIAL OWNERS HEREOF, AND IS NOT TRANSFERABLE TO ANY
         PERSON UNDER ANY CIRCUMSTANCES EXCEPT THAT (I) THE TRUSTEE MAY MAKE
         SUCH NOTATIONS HEREON AS MAY BE REQUIRED PURSUANT TO SECTION 2.6 OF THE
         INDENTURE, (II) THIS GLOBAL NOTE MAY BE EXCHANGED IN WHOLE BUT NOT IN
         PART PURSUANT TO SECTION 2.6(a) OF THE INDENTURE, (III) THIS GLOBAL
         NOTE MAY BE DELIVERED TO THE TRUSTEE FOR CANCELLATION PURSUANT TO
         SECTION 2.11 OF THE INDENTURE AND (IV) THIS GLOBAL NOTE MAY BE

                                       44
<PAGE>

         TRANSFERRED TO A SUCCESSOR DEPOSITARY WITH THE PRIOR WRITTEN
         CONSENT OF THE COMPANY."

         "UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR IN PART FOR NOTES IN
         DEFINITIVE FORM, THIS NOTE MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY
         THE DEPOSITARY TO A NOMINEE OF THE DEPOSITARY OR BY A NOMINEE OF THE
         DEPOSITARY TO THE DEPOSITARY OR TO ANOTHER NOMINEE OF THE DEPOSITARY OR
         BY THE DEPOSITARY OR ANY SUCH NOMINEE TO A SUCCESSOR DEPOSITARY OR A
         NOMINEE OF SUCH SUCCESSOR DEPOSITARY. UNLESS THIS CERTIFICATE IS
         PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST
         COMPANY (55 WATER STREET, NEW YORK, NEW YORK) ("DTC"), TO THE COMPANY
         OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY
         CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR SUCH
         OTHER NAME AS MAY BE REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC
         (AND ANY PAYMENT IS MADE TO CEDE & CO. OR SUCH OTHER ENTITY AS MAY BE
         REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE
         OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS
         WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN
         INTEREST HEREIN."

                           (3) Reg S Temporary Global Note Legend. To the extent
         required by the Depositary, each Reg S Temporary Global Note shall bear
         a legend in substantially the following form:

         "THE RIGHTS ATTACHING TO THIS REGULATION S TEMPORARY GLOBAL NOTE, AND
         THE CONDITIONS AND PROCEDURES GOVERNING ITS EXCHANGE FOR DEFINITIVE
         NOTES, ARE AS SPECIFIED IN THE INDENTURE (AS DEFINED HEREIN). NEITHER
         THE HOLDER NOR THE BENEFICIAL OWNERS OF THIS REGULATION S TEMPORARY
         GLOBAL NOTE SHALL BE ENTITLED TO RECEIVE CASH PAYMENTS OF INTEREST
         DURING THE PERIOD WHICH SUCH HOLDER HOLDS THIS NOTE. NOTHING IN THIS
         LEGEND SHALL BE DEEMED TO PREVENT INTEREST FROM ACCRUING ON THIS NOTE."

                  (h) Cancellation and/or Adjustment of Global Notes. At such
time as all beneficial interests in a particular Global Note have been exchanged
for Definitive Notes or a particular Global Note has been redeemed, repurchased
or cancelled in whole and not in part, each such Global Note shall be returned
to or retained and cancelled by the Trustee in accordance with Section 2.11
hereof. At any time prior to such cancellation, if any beneficial interest in a
Global Note is exchanged for or transferred to a Person who will take delivery
thereof in the form of a beneficial interest in another Global Note or for
Definitive Notes, the principal amount of Notes represented by such Global Note
shall be reduced accordingly and

                                       45
<PAGE>

an endorsement may be made on such Global Note by the Trustee or by the
Depositary at the direction of the Trustee to reflect such reduction; and if the
beneficial interest is being exchanged for or transferred to a Person who will
take delivery thereof in the form of a beneficial interest in another Global
Note, such other Global Note shall be increased accordingly and an endorsement
may be made on such Global Note by the Trustee or by the Depositary at the
direction of the Trustee to reflect such increase.

                  (i) General Provisions Relating to Transfers and Exchanges.

                  (1) To permit registrations of transfers and exchanges, the
         Company shall execute and the Trustee shall authenticate Global Notes
         and Definitive Notes upon receipt of an Authentication Order.

                  (2) No service charge shall be made to a holder of a
         beneficial interest in a Global Note or to a Holder of a Definitive
         Note for any registration of transfer or exchange, but the Company may
         require payment of a sum sufficient to cover any transfer tax or
         similar governmental charge payable in connection therewith (other than
         any such transfer taxes or similar governmental charge payable upon
         exchange or transfer pursuant to Sections 2.10, 3.7, 4.14 and 10.1
         hereof).

                  (3) The Registrar shall not be required to register the
         transfer of or exchange any Note selected for redemption in whole or in
         part, except the unredeemed portion of any Note being redeemed in part.

                  (4) All Global Notes and Definitive Notes issued upon any
         registration of transfer or exchange of Global Notes or Definitive
         Notes shall be the valid obligations of the Company, evidencing the
         same Indebtedness, and entitled to the same benefits under this
         Indenture, as the Global Notes or Definitive Notes surrendered upon
         such registration of transfer or exchange.

                  (5) The Company shall not be required (A) to issue, to
         register the transfer of or to exchange any Notes during a period
         beginning at the opening of business 15 days before the day of any
         selection of Notes for redemption under Section 3.3 hereof and ending
         at the close of business on the day of selection, (B) to register the
         transfer of or to exchange any Note so selected for redemption in whole
         or in part, except the unredeemed portion of any Note being redeemed in
         part or (C) to register the transfer of or to exchange a Note between a
         Record Date and the next succeeding Interest Payment Date.

                  (6) Prior to due presentment for the registration of a
         transfer of any Note, the Trustee, any Agent and the Company may deem
         and treat the Person in whose name any Note is registered as the
         absolute owner of such Note for the purpose of receiving payment of
         principal of and interest on such Notes and for all other purposes, and
         none of the Trustee, any Agent or the Company shall be affected by
         notice to the contrary.

                                       46
<PAGE>

                  (7) The Trustee shall authenticate Global Notes and Definitive
         Notes in accordance with the provisions of Section 2.2 hereof.

                  (8) All certifications, certificates and Opinions of Counsel
         required to be submitted to the Registrar pursuant to this Section 2.6
         to effect a registration of transfer or exchange may be submitted by
         facsimile.

                  Notwithstanding anything herein to the contrary, as to any
certifications and certificates delivered to the Registrar pursuant to this
Section 2.6, the Registrar's duties shall be limited to confirming that any such
certifications and certificates delivered to it are in the form of Exhibits B, C
and D attached hereto. The Registrar shall not be responsible for confirming the
truth or accuracy of representations made in any such certifications or
certificates.

SECTION 2.7. REPLACEMENT NOTES

                  If any mutilated Note is surrendered to the Trustee or the
Company and the Trustee and the Company receive evidence (which evidence may be
from the Trustee) to their satisfaction of the destruction, loss or theft of any
Note, the Company shall issue and the Trustee, upon receipt of an Authentication
Order, shall authenticate a replacement Note if the Trustee's reasonable
requirements are met. If required by the Trustee or the Company, an indemnity
bond must be supplied by the Holder that is sufficient in the judgment of the
Trustee and the Company to protect the Company, the Trustee, any Agent and any
authenticating agent from any loss that any of them may suffer if a Note is
replaced. The Company may charge for its expenses in replacing a Note. Every
replacement Note is an additional obligation of the Company and shall be
entitled to all of the benefits of this Indenture equally and proportionately
with all other Notes duly issued hereunder.

SECTION 2.8. OUTSTANDING NOTES

                  The Notes outstanding at any time are all the Notes
authenticated by the Trustee (including any Note represented by a Global Note)
except for those cancelled by it or at its direction, those delivered to it for
cancellation, those reductions in the interest in a Global Note effected by the
Trustee in accordance with the provisions hereof, and those described in this
Section as not outstanding. Except as set forth in Section 2.9 hereof, a Note
does not cease to be outstanding because the Company or an Affiliate of the
Company holds the Note. If a Note is replaced pursuant to Section 2.7 hereof,
such Note, together with the Guarantee of that particular Note endorsed thereon,
ceases to be outstanding unless the Trustee receives proof satisfactory to it
that the replaced Note is held by a bona fide purchaser. If the principal amount
of any Note is considered paid under Section 4.1 hereof, it ceases to be
outstanding and interest on it ceases to accrue. If the Paying Agent (other than
the Company, a Subsidiary or an Affiliate of any thereof) holds, on a redemption
date or the maturity date, money sufficient to pay Notes payable on that date,
then on and after that date such Notes shall be deemed to be no longer
outstanding and shall cease to accrue interest.

                                       47
<PAGE>

SECTION 2.9. TREASURY NOTES

                  In determining whether the Holders of the required principal
amount of Notes have concurred in any direction, waiver or consent, Notes owned
by the Company, or by any Affiliate of the Company, shall be considered as
though not outstanding, except that for the purposes of determining whether the
Trustee shall be protected in relying on any such direction, waiver or consent,
only Notes that a Trust Officer of the Trustee actually knows are so owned shall
be so disregarded.

SECTION 2.10. TEMPORARY NOTES

                  Until certificates representing Notes are ready for delivery,
the Company may prepare, and the Trustee, upon receipt of an Authentication
Order, shall authenticate, temporary Notes. Temporary Notes shall be
substantially in the form of Definitive Notes but may have variations that the
Company considers appropriate for temporary Notes and as shall be reasonably
acceptable to the Trustee. Without unreasonable delay, the Company shall
prepare, and the Trustee shall authenticate, Definitive Notes in exchange for
temporary Notes. Holders of temporary Notes shall be entitled to all of the
benefits of this Indenture.

SECTION 2.11. CANCELLATION

                  The Company at any time may deliver Notes to the Trustee for
cancellation. The Registrar and Paying Agent shall forward to the Trustee any
Notes surrendered to them for registration of transfer, exchange or payment. The
Trustee, or, at the direction of the Trustee, the Registrar or the Paying Agent
(other than the Company or an Affiliate of the Company), and no one else, shall
cancel all Notes surrendered for registration of transfer, exchange, payment,
replacement or cancellation and shall dispose of cancelled Notes in accordance
with its procedures for the disposition of cancelled securities in effect as of
the date of such disposition (subject to the record retention requirement of the
Exchange Act). Certification of the disposition of all cancelled Notes shall be
delivered to the Company, unless the Company directs the Trustee to deliver
cancelled Notes to the Company. The Company may not issue new Notes to replace
Notes that it has paid or that have been delivered to the Trustee for
cancellation.

SECTION 2.12. DEFAULTED INTEREST

                  Any interest on any Note which is payable, but is not
punctually paid or duly provided for, on any Interest Payment Date, plus, to the
extent lawful, any interest payable on the defaulted interest at the rate and in
the manner provided in Section 4.1 hereof and in the Note (herein called
"Defaulted Interest"), shall forthwith cease to be payable to the registered
Holder on the relevant Record Date, and such Defaulted Interest may be paid by
the Company, at its election in each case, as provided in clause (1) or (2)
below:

                                       48
<PAGE>

                  (1) The Company may elect to make payment of any Defaulted
         Interest to the Persons in whose names the Notes are registered at the
         close of business on a Special Record Date for the payment of such
         Defaulted Interest, which shall be fixed in the following manner. The
         Company shall notify the Trustee and the Paying Agent in writing of the
         amount of Defaulted Interest proposed to be paid on each Note and the
         date of the proposed payment, and at the same time the Company shall
         deposit with the Paying Agent an amount of cash equal to the aggregate
         amount proposed to be paid in respect of such Defaulted Interest or
         shall make arrangements reasonably satisfactory to the Paying Agent for
         such deposit prior to the date of the proposed payment, such cash when
         deposited to be held in trust for the benefit of the Persons entitled
         to such Defaulted Interest as provided in this clause (1). Thereupon
         the Paying Agent shall fix a "Special Record Date" for the payment of
         such Defaulted Interest which shall be not more than 15 days and not
         less than 10 days prior to the date of the proposed payment and not
         less than 10 days after the receipt by the Paying Agent of the notice
         of the proposed payment. The Paying Agent shall promptly notify the
         Company and the Trustee of such Special Record Date and, in the name
         and at the expense of the Company, shall cause notice of the proposed
         payment of such Defaulted Interest and the Special Record Date therefor
         to be mailed, first-class postage prepaid, to each Holder at its
         address as it appears in the Note register maintained by the Registrar
         not less than 10 days prior to such Special Record Date. Notice of the
         proposed payment of such Defaulted Interest and the Special Record Date
         therefor having been mailed as aforesaid, such Defaulted Interest shall
         be paid to the persons in whose names the Notes (or their respective
         predecessor Notes) are registered on such Special Record Date and shall
         no longer be payable pursuant to the following clause (2).

                  (2) The Company may make payment of any Defaulted Interest in
         any other lawful manner not inconsistent with the requirements of any
         securities exchange on which the Notes may be listed, and upon such
         notice as may be required by such exchange, if, after notice given by
         the Company to the Trustee and the Paying Agent of the proposed payment
         pursuant to this clause, such manner shall be deemed practicable by the
         Trustee and the Paying Agent.

                  Subject to the foregoing provisions of this Section, each Note
delivered under this Indenture upon registration of transfer of or in exchange
for or in lieu of any other Note shall carry the rights to interest accrued and
unpaid, and to accrue, which were carried by such other Note.

SECTION 2.13. CUSIP NUMBERS

                  The Company in issuing the Notes may use "CUSIP" numbers (if
then generally in use), and, if so, the Trustee shall use "CUSIP" numbers in
notices of redemption as a convenience to Holders; provided, that any such
notice may state that no representation is made as to the correctness of such
numbers either as printed on the Notes or as contained in any notice of a
redemption and that reliance may be placed only on the other identification
numbers printed

                                       49
<PAGE>

on the Notes, and any such redemption shall not be affected by any defect in or
omission of such numbers. The Company will promptly notify the Trustee of any
change in the "CUSIP" numbers.

SECTION 2.14. ISSUANCE OF ADDITIONAL NOTES

                  The company may, subject to Section 4.11 hereof and applicable
law, issue Additional Notes under this Indenture. The Notes issued on the Issue
Date and any additional Notes subsequently issued shall be treated as a single
class for all purposes under this Indenture.

                                   ARTICLE III

                                   REDEMPTION

SECTION 3.1. OPTIONAL REDEMPTION

                  (a) Except as set forth in clause (b) of this Section 3.1, the
Company shall not have the option to redeem the Notes pursuant to this Section
3.1 prior to December 15, 2005. The Notes will be redeemable for cash at the
option of the Company, in whole or in part, at any time on or after December 15,
2005, upon not less than 30 days nor more than 60 days prior notice mailed by
first class mail to each Holder at its last registered address, at the following
redemption prices (expressed as percentages of the principal amount) if redeemed
during the 12-month period commencing December 15 of the years indicated below,
in each case (subject to the right of Holders of record on a Record Date to
receive the corresponding interest due (and the corresponding Liquidated
Damages, if any) on the corresponding Interest Payment Date that is on or prior
to such Redemption Date), together with accrued and unpaid interest and
Liquidated Damages, if any, thereon to the Redemption Date:

<Table>
<Caption>

           YEAR                                                           PERCENTAGE
           ----                                                           ----------
<S>                                                                       <C>

           2005.............................................................105.250%
           2006.............................................................102.625%
           2007 and thereafter..............................................100.000%
</Table>

                  (b) Notwithstanding the provisions of clause (a) of this
Section 3.1, at any time or from time to time on or prior to December 15, 2004,
upon any Public Equity Offering, up to 35% of the aggregate principal amount of
the Notes issued pursuant to this Indenture may be redeemed at the option of the
Company within 90 days of such Public Equity Offering, on not less than 30 days,
but not more than 60 days, notice to each Holder of the Notes to be redeemed,
with cash from the Net Cash Proceeds of such Public Equity Offering, at a
redemption price equal to 110.500% of the principal amount thereof (subject to
the right of Holders of record on a Record Date to receive the corresponding
interest (and the corresponding Liquidated Damages, if any) due on the Interest
Payment Date that is on or prior to such Redemption Date), together with accrued
and unpaid interest and Liquidated Damages, if any,

                                       50
<PAGE>

thereon to the Redemption Date; provided, however, that immediately following
such redemption not less than 65% of the aggregate principal amount of the Notes
originally issued pursuant to this Indenture on the Issue Date remain
outstanding.

                  (c) Any redemption pursuant to this Section 3.1 shall be made
pursuant to the provisions of Sections 3.2 through 3.7 hereof.

SECTION 3.2. NOTICES TO TRUSTEE

                  If the Company elects to redeem Notes pursuant to Section 5 of
the Notes, it shall notify the Trustee and the Paying Agent in writing of the
Redemption Date and the principal amount of Notes to be redeemed and whether it
wants the Paying Agent to give notice of redemption to the Holders.

                  If the Company elects to reduce the principal amount of Notes
to be redeemed pursuant to Section 5 of the Notes by crediting against any such
redemption Notes it has not previously delivered to the Trustee and the Paying
Agent for cancellation, it shall so notify the Trustee, in the form of an
Officers' Certificate, and the Paying Agent of the amount of the reduction and
deliver such Notes with such notice.

                  The Company shall give each notice to the Trustee and the
Paying Agent provided for in this Section 3.2 at least 15 days before the date
on which the notice of redemption is to be given (unless a shorter notice shall
be satisfactory to the Trustee and the Paying Agent). Any such notice may be
cancelled at any time prior to notice of such redemption being mailed to any
Holder and shall thereby be void and of no effect.

SECTION 3.3. SELECTION OF NOTES TO BE REDEEMED

                  If less than all of the Notes are to be redeemed at any time,
the Trustee shall select the Notes or portions thereof to be redeemed among the
Holders of the Notes in compliance with the requirements of the principal
national securities exchange, if any, on which the Notes are listed or, if the
Notes are not so listed, on a pro rata basis, by lot or in accordance with any
other method the Trustee considers fair and appropriate.

                  The Trustee shall make the selection from the Notes
outstanding and not previously called for redemption and shall promptly notify
the Company and the Paying Agent in writing of the Notes selected for redemption
and, in the case of any Note selected for partial redemption, the principal
amount thereof to be redeemed. Notes in denominations of $1,000 may be redeemed
only in whole. The Trustee may select for redemption portions (equal to $1,000
or any integral multiple thereof) of the principal of Notes that have
denominations larger than $1,000. Provisions of this Indenture that apply to
Notes called for redemption also apply to portions of Notes called for
redemption.

                                       51
<PAGE>

SECTION 3.4. NOTICE OF REDEMPTION

                  At least 30 days, but not more than 60 days, prior to the
Redemption Date, the Company shall mail a notice of redemption by first class
mail, postage prepaid, to the Trustee, the Paying Agent and each Holder whose
Notes are to be redeemed. At the Company's request delivered at least 15 days
prior to the date on which such notice is to be given (unless a shorter period
shall be acceptable to the Paying Agent), the Paying Agent shall give the notice
of redemption in the Company's name and at the Company's expense. Each notice
for redemption shall identify the Notes to be redeemed and shall state:

                  (1) the Redemption Date;

                  (2) the Redemption Price, including accrued and unpaid
         interest and Liquidated Damages, if any, to be paid upon such
         redemption;

                  (3) the name and address of the Paying Agent;

                  (4) that Notes called for redemption must be surrendered to
         the Paying Agent at the address specified in such notice to collect the
         Redemption Price;

                  (5) that, unless (a) the Company defaults in its obligation to
         deposit with the Paying Agent cash which through the scheduled payment
         of principal and interest (and Liquidated Damages, if any) in respect
         thereof in accordance with their terms shall provide the amount to fund
         the Redemption Price in accordance with Section 3.6 hereof or (b) such
         redemption payment is prohibited, interest (and Liquidated Damages, if
         any) on Notes called for redemption ceases to accrue on and after the
         Redemption Date and the only remaining right of the Holders of such
         Notes is to receive payment of the Redemption Price, including accrued
         and unpaid interest (and Liquidated Damages, if any) to the Redemption
         Date, upon surrender to the Paying Agent of the Notes called for
         redemption and to be redeemed;

                  (6) if any Note is being redeemed in part, the portion of the
         principal amount, equal to $1,000 or any integral multiple thereof, of
         such Note to be redeemed and that, on and after the Redemption Date,
         and upon surrender of such Note, a new Note or Notes in aggregate
         principal amount equal to the unredeemed portion thereof shall be
         issued;

                  (7) if less than all the Notes are to be redeemed, the
         identification of the particular Notes (or portion thereof) to be
         redeemed, as well as the aggregate principal amount of such Notes to be
         redeemed and the aggregate principal amount of Notes to be outstanding
         after such partial redemption;

                  (8) the CUSIP number of the Notes to be redeemed; and

                  (9) that the notice is being sent pursuant to this Section 3.4
         and pursuant to the optional redemption provisions of Section 5 of the
         Notes.

                                       52
<PAGE>

SECTION 3.5. EFFECT OF NOTICE OF REDEMPTION

                  Once notice of redemption is mailed in accordance with Section
3.4 hereof, Notes called for redemption become due and payable on the Redemption
Date and at the Redemption Price, including accrued and unpaid interest (and
Liquidated Damages, if any) to the Redemption Date. Upon surrender to the
Trustee or Paying Agent, such Notes called for redemption shall be paid at the
Redemption Price, including interest and Liquidated Damages, if any, accrued and
unpaid to the Redemption Date; provided, that if the Redemption Date is on or
after an interest Record Date on which the Holders of record have a right to
receive the corresponding interest due, and Liquidated Damages, if any, and is
on or before the associated Interest Payment Date, any accrued and unpaid
interest and Liquidated Damages, if any, due on such Interest Payment Date shall
be paid to the Person in whose name a Note is registered at the close of
business on such Record Date on the corresponding Interest Payment Date; and
provided, further, that if a Redemption Date is a Legal Holiday, payment shall
be made on the next succeeding Business Day and no interest shall accrue for the
period from such Redemption Date to such succeeding Business Day.

SECTION 3.6. DEPOSIT OF REDEMPTION PRICE

                  On or prior to the Redemption Date, the Company shall deposit
with the Paying Agent (other than the Company or an Affiliate of the Company)
cash sufficient to pay the Redemption Price of all Notes to be redeemed on such
Redemption Date (other than Notes or portions thereof called for redemption on
that date that have been delivered by the Company to the Trustee for
cancellation). The Paying Agent shall promptly return to the Company any cash so
deposited which is not required for that purpose upon the written request of the
Company.

                  If the Company complies with the preceding paragraph and
payment of the Notes called for redemption is not prohibited for any reason,
interest (and Liquidated Damages, if any) on the Notes to be redeemed shall
cease to accrue on the applicable Redemption Date, whether or not such Notes are
presented for payment. Notwithstanding anything herein to the contrary, if any
Note surrendered for redemption in the manner provided in the Notes shall not be
so paid upon surrender for redemption because of the failure of the Company to
comply with the preceding paragraph, interest shall (and Liquidated Damages, if
any) continue to accrue and be paid from the Redemption Date until such payment
is made on the unpaid principal, and, to the extent lawful, on any interest not
paid on such unpaid principal, in each case at the rate and in the manner
provided in Section 4.1 hereof and the Note.

SECTION 3.7. NOTES REDEEMED IN PART

                  Upon surrender of a Note that is to be redeemed in part, the
Company shall execute, and the Trustee shall authenticate and deliver to the
Holder, without service charge to the Holder, a new Note or Notes equal in
principal amount to the unredeemed portion of the Note surrendered.

                                       53
<PAGE>

SECTION 3.8. NO MANDATORY REDEMPTION

                  The Company shall not be required to make mandatory redemption
payments with respect to the Notes. The Notes shall not have the benefit of any
sinking fund.

                                   ARTICLE IV

                                    COVENANTS

SECTION 4.1. PAYMENT OF NOTES

                  The Company shall pay the principal of and interest (and
Liquidated Damages, if any) on the Notes on the dates and in the manner provided
herein and in the Notes. An installment of principal of or interest (or
Liquidated Damages, if any) on the Notes shall be considered paid on the date it
is due if the Trustee or Paying Agent (other than the Company or an Affiliate of
the Company) holds for the benefit of the Holders (on or before 11:00 a.m. New
York City time to the extent necessary to provide the funds to the Depositary in
accordance with the Depositary's procedures) on that date cash deposited and
designated for and sufficient to pay the installment.

                  The Company shall pay interest on overdue principal and on
overdue installments of interest (and Liquidated Damages, if any) at the rate
specified in the Notes compounded semi- annually, to the extent lawful.

SECTION 4.2. MAINTENANCE OF OFFICE OR AGENCY

                  The Company and the Guarantors shall maintain in the Borough
of Manhattan, The City of New York, an office or agency where Notes may be
presented or surrendered for payment, where Notes may be surrendered for
registration of transfer or exchange and where notices and demands to or upon
the Company and the Guarantors in respect of the Notes and this Indenture may be
served. The Company and the Guarantors shall give prompt written notice to the
Trustee and the Paying Agent of the location, and any change in the location, of
such office or agency. If at any time the Company and the Guarantors shall fail
to maintain any such required office or agency or shall fail to furnish the
Trustee and the Paying Agent with the address thereof, such presentations,
surrenders, notices and demands may be made or served at the address of the
Trustee set forth in Section 12.2 hereof.

                  The Company and the Guarantors may also from time to time
designate one or more other offices or agencies where the Notes may be presented
or surrendered for any or all such purposes and may from time to time rescind
such designations; provided, however, that no such designation or rescission
shall in any manner relieve the Company and the Guarantors of their obligation
to maintain an office or agency in the Borough of Manhattan, The City of New
York, for such purposes. The Company and the Guarantors shall give prompt
written notice to

                                       54
<PAGE>

the Trustee and the Paying Agent of any such designation or rescission and of
any change in the location of any such other office or agency. The Company
hereby initially designates the Corporate Trust Office of the Trustee as such
office.

SECTION 4.3. LIMITATION ON RESTRICTED PAYMENTS

         The Company and the Guarantors shall not, and neither the Company nor
the Guarantors shall permit any of their respective Subsidiaries to, directly or
indirectly, make any Restricted Payment if, after giving effect to such
Restricted Payment on a pro forma basis:

                  (1) a Default or an Event of Default shall have occurred and
         be continuing;

                  (2) the Company is not permitted to incur at least $1.00 of
         additional Indebtedness pursuant to the Debt Incurrence Ratio; or

                  (3) the aggregate amount of all Restricted Payments made by
         the Company and its Subsidiaries, including after giving effect to such
         proposed Restricted Payment, on and after the Issue Date, would exceed,
         without duplication, the sum of:

                           (a) 50% of the Company's aggregate Consolidated Net
                  Income for the period (taken as one accounting period),
                  commencing on the first day of the first full fiscal quarter
                  commencing after the Issue Date, to and including the last day
                  of the fiscal quarter ended immediately prior to the date of
                  each such calculation for which the Company's consolidated
                  financial statements are required to be delivered to the
                  Trustee or, if sooner, filed with the SEC (or, in the event
                  Consolidated Net Income for such period is a deficit, then
                  minus 100% of such deficit); plus

                           (b) the aggregate Net Cash Proceeds received by the
                  Company from the issuance or sale of its Qualified Capital
                  Stock (other than (i) to one of the Company's Subsidiaries and
                  (ii) to the extent applied in connection with a Qualified
                  Exchange or, to avoid duplication, otherwise given credit for
                  in any provision of paragraph (c) below), after the Issue
                  Date; plus

                           (c) except in each case, in order to avoid
                  duplication, to the extent any such payment or proceeds have
                  been included in the calculation of Consolidated Net Income,
                  an amount equal to the net reduction in Investments (other
                  than returns of or from Permitted Investments) in any Person
                  resulting from cash distributions on or cash repayments of any
                  Investments, including payments of interest on Indebtedness,
                  dividends, repayments of loans or advances, or other
                  distributions or other transfers of assets, in each case to
                  the Company or any Subsidiary or from the Net Cash Proceeds
                  from the sale of any such Investment or from redesignations of
                  Unrestricted Subsidiaries as Subsidiaries (valued in each case
                  as provided in the definition of "Investments"),

                                       55
<PAGE>

                  not to exceed, in each case, the amount of Investments
                  previously made by the Company or any Subsidiary in such
                  Person, including, if applicable, such Unrestricted
                  Subsidiary, less the cost of disposition.

         The foregoing clauses (2) and (3) of the immediately preceding
paragraph, however, shall not prohibit:

                  (u) repurchases of Capital Stock from the Company's employees
         or directors (or their heirs or estates) or employees or directors (or
         their heirs or estates) of its Subsidiaries upon the death, disability
         or termination of employment in an aggregate amount to all employees or
         directors (or their heirs or estates) not to exceed in the aggregate
         $1,000,000 per calendar year;

                  (v) Restricted Payments in an aggregate amount not to exceed
         $5,000,000,

and the provisions of the immediately preceding paragraph shall not prohibit:

                  (w) any dividend, distribution or other payments by any of the
         Company's Subsidiaries on its Equity Interests that is paid pro rata to
         all holders of such Equity Interests;

                  (x) a Qualified Exchange;

                  (y) the payment of any dividend on Qualified Capital Stock
         within 60 days after the date of its declaration if such dividend could
         have been made on the date of such declaration in compliance with the
         foregoing provisions; or

                  (z) in the event of a Change of Control that also constitutes
         a "Change of Control" as defined in the Convertible Note, the
         prepayment or redemption of the Convertible Note in accordance with
         Section 4 thereof (Mandatory Prepayment/Redemption) as in effect on the
         Issue Date; provided, that no such prepayment or redemption may be made
         under this clause (z) until the Company has made a Change of Control
         Offer in accordance with Section 10.1 and any Notes tendered pursuant
         thereto have been purchased in accordance therewith on or prior to the
         Change of Control Purchase Date; and provided further, that the Company
         shall include in the Change of Control Offer notice delivered to
         Holders a statement that the Company will prepay or redeem the
         Convertible Note upon the completion of the Change of Control Offer in
         accordance with this clause (z).

         The full amount of any Restricted Payment made pursuant to the
foregoing clauses (u), (w) (to avoid duplication, exclusive of amounts that
reduced Consolidated Net Income), (y) and (z) (but not pursuant to clause (v) or
(x)) of the immediately preceding sentence, however, will be counted as
Restricted Payments made for purposes of the calculation of the aggregate amount

                                       56
<PAGE>

of Restricted Payments available to be made referred to in clause (3) of the
first paragraph of this Section 4.3.

         For purposes of this Section 4.3, the amount of any Restricted Payment
made or returned, if other than in cash, shall be the fair market value thereof,
as determined in the good faith reasonable judgment of the Company's Board of
Directors, unless stated otherwise, at the time made or returned, as applicable.
Additionally, on the date of each Restricted Payment, the Company shall deliver
an Officers' Certificate to the Trustee describing in reasonable detail the
nature of such Restricted Payment in excess of $10,000,000 that is not a
Restricted Investment, stating the amount of such Restricted Payment, stating in
reasonable detail the provisions of this Indenture pursuant to which such
Restricted Payment was made and certifying that such Restricted Payment was made
in compliance with the terms of this Indenture.

SECTION 4.4. CORPORATE AND PARTNERSHIP EXISTENCE

                  Except as otherwise permitted by Article V, Section 4.14 or
Section 11.4, the Company and the Guarantors shall do or cause to be done all
things necessary to preserve and keep in full force and effect their respective
corporate, partnership or other organizational existence, as the case may be,
and the corporate, partnership or other organizational existence, as the case
may be, of each of their Subsidiaries in accordance with the respective
organizational documents of each of them and the material rights (charter and
statutory) and material corporate franchises of the Company, the Guarantors and
each of their respective Subsidiaries; provided, however, that neither the
Company nor any Guarantor shall be required to preserve, with respect to
themselves, any right or franchise, and with respect to any of their respective
Subsidiaries, any such existence, right or franchise, if (a) the Company shall
determine that the preservation thereof is no longer desirable in the conduct of
the business of the Company and (b) the loss thereof is not adverse in any
material respect to the Holders.

SECTION 4.5. PAYMENT OF TAXES AND OTHER CLAIMS

                  The Company and the Guarantors shall, and each of the Company
and the Guarantors shall cause each of their Subsidiaries to, pay or discharge
or cause to be paid or discharged, before the same shall become delinquent, (a)
all material taxes, assessments and governmental charges (including withholding
taxes and any penalties, interest and additions to taxes) levied or imposed upon
the Company, any Guarantor or any of their Subsidiaries or any of their
respective properties and assets and (b) all material lawful claims, whether for
labor, materials, supplies or services, which have become due and payable and
which by law have or may become a Lien upon the property and assets of the
Company, any Guarantor or any of their Subsidiaries; provided, however, that
neither the Company nor any Guarantor shall be required to pay or discharge or
cause to be paid or discharged any such tax, assessment, charge or claim whose
amount, applicability or validity is being contested in good faith by
appropriate proceedings and for which disputed amounts adequate reserves have
been established in accordance with GAAP.

                                       57
<PAGE>

SECTION 4.6. MAINTENANCE OF PROPERTIES AND INSURANCE

                  The Company and the Guarantors shall cause all material
properties used or useful in the conduct of their business and the business of
each of their Subsidiaries to be maintained and kept in good condition, repair
and working order (reasonable wear and tear excepted) and supplied with all
necessary equipment and shall cause to be made all necessary repairs, renewals,
replacements, betterments and improvements thereof, all as in their reasonable
judgment may be necessary, so that the business carried on in connection
therewith may be properly conducted at all times; provided, however, that
nothing in this Section 4.6 shall prevent the Company or any Guarantor from
discontinuing any operation or maintenance of any of such properties, or
disposing of any of them, if such discontinuance or disposal is (a)(i) in the
judgment of the Board of Directors of the Company, desirable in the conduct of
the business of the Company and (ii) not adverse in any material respect to the
Holders or (b) otherwise permitted under Section 4.14.

                  The Company and the Guarantors shall provide, or cause to be
provided, for themselves and each of their Subsidiaries, insurance (including
appropriate self-insurance) against loss or damage of the kinds that, in the
reasonable, good faith opinion of the Board of Directors of the Company, is
adequate and appropriate for the conduct of the business of the Company, the
Guarantors and such Subsidiaries in a prudent manner, with (except for self-
insurance) reputable insurers or with the government of the United States of
America or an agency or instrumentality thereof, in such amounts, with such
deductibles, and by such methods as shall be customary, in the reasonable, good
faith opinion of the Company and adequate and appropriate for the conduct of the
business of the Company, the Guarantors and such Subsidiaries in a prudent
manner for entities similarly situated in the industry.

SECTION 4.7. COMPLIANCE CERTIFICATE; NOTICE OF DEFAULT

                  (a) The Company shall deliver to the Trustee within 120 days
after the end of its fiscal year an Officers' Certificate, one of the signers of
which shall be the principal executive, principal financial or principal
accounting officer of the Company, complying with TIA 314(a)(4) and stating that
a review of its activities and the activities of its Subsidiaries, if any,
during the preceding fiscal year has been made under the supervision of the
signing Officers with a view to determining whether the Company has kept,
observed, performed and fulfilled its obligations under this Indenture (without
regard to notice requirements or grace periods) and further stating, as to each
such Officer signing such certificate, whether or not the signer knows of any
failure by the Company, any Guarantor or any Subsidiary of the Company to comply
with any conditions or covenants in this Indenture and, if such signer does know
of such a failure to comply, the certificate shall describe such failure with
particularity. The Officers' Certificate shall also notify the Trustee should
the relevant fiscal year end on any date other than the current fiscal year end
date.

                  (b) The Company shall, so long as any of the Notes are
outstanding, deliver to the Trustee, promptly upon becoming aware of any Default
or Event of Default, an Officers'

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<PAGE>

Certificate specifying such Default or Event of Default and what action the
Company is taking or proposes to take with respect thereto. The Trustee shall
not be deemed to have knowledge of any Default, any Event of Default or any such
fact unless one of its Trust Officers receives written notice thereof from the
Company or any of the Holders.

SECTION 4.8. REPORTS

                  Whether or not the Company is subject to the reporting
requirements of Section 13 or 15(d) of the Exchange Act, the Company shall
furnish to the Trustee and deliver or cause to be delivered, to each Holder and
to prospective purchasers of Notes identified to the Company by an Initial
Purchaser, within 5 days after the Company is or would have been (if it were
subject to such reporting obligations) required to file such with the SEC,
annual and quarterly financial statements substantially equivalent to financial
statements that would have been included in reports filed with the SEC, if the
Company were subject to the requirements of Section 13 or 15(d) of the Exchange
Act, including, with respect to annual information only, a report thereon by the
Company's certified independent public accountants as such would be required in
such reports to the SEC, and, in each case, together with a management's
discussion and analysis of financial condition and results of operations which
would be so required and, unless the SEC will not accept such reports, file with
the SEC the annual, quarterly and other reports which the Company is or would
have been required to file with the SEC.

                  Delivery of such reports, information and documents to the
Trustee is for informational purposes only and the Trustee's receipt of such
shall not constitute constructive notice of any information contained therein or
determinable from information contained therein, including the Company's
compliance with any of its covenants hereunder (as to which the Trustee is
entitled to rely exclusively on Officers' Certificates).

                  For so long as any Transfer Restricted Notes remain
outstanding, the Company shall make available (which shall include filings by
EDGAR) to all Holders and to securities analysts and prospective investors, upon
their request, the information required to be delivered pursuant to Rule
144A(d)(4) under the Securities Act.

SECTION 4.9. LIMITATION ON STATUS AS INVESTMENT COMPANY

                  Neither the Company nor any of its Subsidiaries shall become
required to register as an "investment company" (as that term is defined in the
Investment Company Act of 1940, as amended), or from otherwise becoming subject
to regulation under the Investment Company Act.

SECTION 4.10. LIMITATION ON TRANSACTIONS WITH AFFILIATES

                  Neither the Company nor any of its Subsidiaries shall on or
after the Issue Date enter into or suffer to exist any contract, agreement,
arrangement or transaction with any Affiliate (an "Affiliate Transaction"), or
any series of related Affiliate Transactions (other than

                                       59
<PAGE>

Exempted Affiliate Transactions), (1) unless it is determined that the terms of
such Affiliate Transaction are fair and reasonable to the Company, and no less
favorable to the Company than could have been obtained in an arm's length
transaction with a non-Affiliate, and (2) if involving consideration to either
party in excess of $2,000,000, unless such Affiliate Transaction(s) has been
approved by a majority of the members of the Company's Board of Directors that
are disinterested in such transaction, if there are any directors who are so
disinterested, and (3) if involving consideration to either party in excess of
$10,000,000, or $2,000,000 if there are no disinterested directors for such
transaction, unless, in addition the Company, prior to the consummation thereof,
obtains a written favorable opinion as to the fairness of such transaction to
the Company from a financial point of view from an independent investment
banking firm of national reputation in the United States or, if pertaining to a
matter for which such investment banking firms do not customarily render such
opinions, an accounting, appraisal or valuation firm of national reputation in
the United States. Within 5 days of any Affiliate Transaction(s) involving
consideration to either party of $2,000,000 or more, the Company shall deliver
to the Trustee an Officers' Certificate addressed to the Trustee certifying that
such Affiliate Transaction (or Transactions) complied with clause (1), (2), and
(3), of this Section 4.10, as applicable.

SECTION 4.11. LIMITATION ON INCURRENCE OF ADDITIONAL INDEBTEDNESS

                  Except as set forth in this Section 4.11, the Company and the
Guarantors shall not, and neither the Company nor the Guarantors shall permit
any of their respective Subsidiaries to, directly or indirectly, issue, assume,
guarantee, incur, become directly or indirectly liable with respect to
(including as a result of an Acquisition), or otherwise become responsible for,
contingently or otherwise (individually and collectively, to "incur" or, as
appropriate, an "incurrence"), any Indebtedness (including Disqualified Capital
Stock and Acquired Indebtedness), other than Permitted Indebtedness.

                  Notwithstanding the foregoing if:

                  (1) no Default or Event of Default shall have occurred and be
         continuing at the time of, or would occur after giving effect on a pro
         forma basis to, such incurrence of Indebtedness and

                  (2) on the date of such incurrence (the "Incurrence Date"),
         the Company's Consolidated Coverage Ratio for the Reference Period
         immediately preceding the Incurrence Date, after giving effect on a pro
         forma basis to such incurrence of such Indebtedness and, to the extent
         set forth in the definition of Consolidated Coverage Ratio, the use of
         proceeds thereof, would be at least (x) 2.5 to 1.0, if such incurrence
         occurs prior to January 1, 2004, and (y) 2.75 to 1.0, if the incurrence
         occurs on or after January 1, 2004 (the "Debt Incurrence Ratio"),

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<PAGE>

then the Company and the Guarantors may incur such Indebtedness (including
Disqualified Capital Stock).

                  In addition, the foregoing limitations of the first paragraph
of this Section 4.11 will not prohibit:

                  (a) the Company's incurrence or the incurrence by any
Guarantor of Purchase Money Indebtedness; provided, that

                           (1) the aggregate amount of such Indebtedness
                  incurred and outstanding at any time pursuant to this
                  paragraph (a) (plus any Refinancing Indebtedness issued to
                  retire, defease, refinance, replace or refund such
                  Indebtedness) shall not exceed $10,000,000; and

                           (2) in each case, such Indebtedness shall not
                  constitute more than 100% of the Company's cost or the cost to
                  such Guarantor (determined in accordance with GAAP), as
                  applicable, of the property so purchased, constructed,
                  improved or leased;

                  (b) if no Event of Default shall have occurred and be
continuing, the Company's incurrence or the incurrence by any Guarantor of
Indebtedness in an aggregate amount incurred and outstanding at any time
pursuant to this paragraph (b) (plus any Refinancing Indebtedness incurred to
retire, defease, refinance, replace or refund such Indebtedness) of up to
$17,500,000; and

                  (c) the Company's incurrence or the incurrence by any
Guarantor of Indebtedness pursuant to the Credit Agreement in an aggregate
amount incurred and outstanding at any time pursuant to this paragraph (c) (plus
any Refinancing Indebtedness incurred to retire, defease, refinance, replace or
refund such Indebtedness) of up to $35,000,000, minus the amount of any such
Indebtedness (1) retired with the Net Cash Proceeds from any Asset Sale applied
to permanently reduce the outstanding amounts or the commitments with respect to
such Indebtedness pursuant to clause (b) of the second paragraph of Section 4.14
or (2) assumed by a transferee in an Asset Sale so long as neither the Company
nor such Guarantor continues to be an obligor under such Indebtedness.

         Indebtedness (including Disqualified Capital Stock) of any Person which
is outstanding at the time such Person becomes one of the Company's Subsidiaries
(including upon designation of any subsidiary or other Person as a Subsidiary)
or is merged with or into or consolidated with the Company or one of the
Company's Subsidiaries shall be deemed to have been incurred at the time such
Person becomes or is designated one of the Company's Subsidiaries or is merged
with or into or consolidated with the Company or one of the Company's
Subsidiaries as applicable.

                                       61
<PAGE>

         Notwithstanding any other provision of this Section 4.11, but only to
avoid duplication, a guarantee of the Company's Indebtedness or of the
Indebtedness of another Guarantor incurred in accordance with the terms of this
Indenture issued at the time such Indebtedness was incurred or if later at the
time the guarantor thereof became one of the Company's Subsidiaries will not
constitute a separate incurrence, or amount outstanding, of Indebtedness. Upon
each incurrence the Company may designate pursuant to which provision of this
Section 4.11 such Indebtedness is being incurred and the Company may subdivide
an amount of Indebtedness and designate more than one provision pursuant to
which such amount of Indebtedness is being incurred and such Indebtedness shall
not be deemed to have been incurred or outstanding under any other provision of
this Section 4.11, except as stated otherwise in the foregoing provisions.

SECTION 4.12. LIMITATIONS ON DIVIDENDS AND OTHER PAYMENT RESTRICTIONS AFFECTING
              SUBSIDIARIES

                  The Company and the Guarantors shall not, and neither the
Company nor the Guarantors shall permit any of their respective Subsidiaries to,
directly or indirectly, create, assume or suffer to exist any consensual
restriction on the ability of any Subsidiary of the Company to pay dividends or
make other distributions to or on behalf of, or to pay any obligation to or on
behalf of, or otherwise to transfer assets or property to or on behalf of, or to
make or pay loans or advances to or on behalf of, the Company or any of its
Subsidiaries, except:

                  (1) restrictions imposed by the Notes or this Indenture or by
         the Company's other Indebtedness (which may also be guaranteed by the
         Guarantors); provided, that such restrictions are not materially more
         restrictive than those imposed by this Indenture and the Notes;

                  (2) restrictions imposed by applicable law;

                  (3) existing restrictions under Existing Indebtedness;

                  (4) restrictions under any Acquired Indebtedness not incurred
         in violation of this Indenture or any agreement (including any Equity
         Interest) relating to any property, asset, or business acquired by the
         Company or any of its Subsidiaries, which restrictions in each case
         existed at the time of acquisition, were not put in place in connection
         with or in anticipation of such acquisition and are not applicable to
         any Person, other than the Person acquired, or to any property, asset
         or business, other than the property, assets and business so acquired;

                  (5) any restriction imposed by Indebtedness incurred under the
         Credit Agreement pursuant to clause (c) of Section 4.11; provided, that
         such restriction or requirement is no more restrictive than that
         imposed by the Credit Agreement as of the Issue Date;

                                       62
<PAGE>

                  (6) restrictions with respect solely to any of the Company's
         Subsidiaries imposed pursuant to a binding agreement which has been
         entered into for the sale or disposition of all of the Equity Interests
         or assets of such Subsidiary; provided, that such restrictions apply
         solely to the Equity Interests or assets of such Subsidiary which are
         being sold;

                  (7) restrictions on transfer contained in Purchase Money
         Indebtedness incurred pursuant to clause (a) of Section 4.11; provided,
         that such restrictions relate only to the transfer of the property
         acquired with the proceeds of such Purchase Money Indebtedness;

                  (8) in connection with and pursuant to permitted Refinancings,
         replacements of restrictions imposed pursuant to clauses (1), (3), (4)
         or (7) or this clause (8) of this paragraph that are not materially
         more restrictive than those being replaced and do not apply to any
         other Person or assets than those that would have been covered by the
         restrictions in the Indebtedness so refinanced; and

                  (9) customary provisions in partnership agreements, limited
         liability company organizational governance documents, joint venture
         agreements and other similar agreements entered into in the ordinary
         course of business that restrict the transfer of ownership interests in
         such partnership, limited liability company, joint venture or similar
         Person.

         Notwithstanding the foregoing, (a) customary provisions restricting
subletting or assignment of any lease entered into in the ordinary course of
business, consistent with industry practice and (b) any asset subject to a Lien
which is not prohibited to exist with respect to such asset pursuant to the
terms of this Indenture may be subject to customary restrictions on the transfer
or disposition thereof pursuant to such Lien.

SECTION 4.13. LIMITATIONS ON LAYERING INDEBTEDNESS

                  The Company and the Guarantors shall not, and neither the
Company nor the Guarantors shall permit any of their respective Subsidiaries to,
directly or indirectly, incur any Indebtedness that is contractually subordinate
to any of the Company's other Indebtedness or the other Indebtedness of any
Guarantor unless, by its terms, such Indebtedness is made at least as
contractually subordinate to the Notes or the Guarantees, as applicable.

SECTION 4.14. LIMITATION ON SALES OF ASSETS AND SUBSIDIARY STOCK

                  The Company and the Guarantors shall not, and neither the
Company nor the Guarantors shall permit any of their respective Subsidiaries to,
in one or a series of related transactions, convey, sell, transfer, assign or
otherwise dispose of, directly or indirectly, any of their property, business or
assets, including by merger or consolidation (in the case of a Guarantor or one
of the Company's Subsidiaries), and including any sale or other transfer or

                                       63
<PAGE>

issuance of any Equity Interests of any of the Company's Subsidiaries, whether
by the Company or one of its Subsidiaries or through the issuance, sale or
transfer of Equity Interests by one of the Company's Subsidiaries and including
any sale and leaseback transaction (any of the foregoing, an "Asset Sale"),
unless:

                  (1) at least 75% of the total consideration for such Asset
         Sale or series of related Asset Sales consists of cash or Cash
         Equivalents; and

                  (2) the Company receives or such Subsidiary receives, as
         applicable, fair market value for such Asset Sale, such determination
         to be made in good faith by the Company's Board of Directors for Asset
         Sales exceeding $2,000,000.

Solely for purposes of (1) above, (a) any Indebtedness (other than Subordinated
Indebtedness) of the Company or such Subsidiary that is expressly assumed by the
transferee in such Asset Sale and with respect to which the Company is and its
Subsidiaries are fully and unconditionally released from any and all obligations
in connection therewith, (b) property that within 30 days of such Asset Sale is
converted into cash or Cash Equivalents; provided, that such cash and Cash
Equivalents shall be treated as Net Cash Proceeds attributable to the original
Asset Sale for which such property was received, and (c) the fair market value,
as determined in good faith by the Board of Directors, of any asset (other than
securities) received by the Company or any Subsidiary that, in the good faith
reasonable judgment of the Company's Board of Directors, will immediately
constitute or be a part of a Related Business shall be deemed to be cash or Cash
Equivalents.

         Within 360 days following such Asset Sale, the Net Cash Proceeds
therefrom are:

                  (a) invested in fixed assets and property (other than notes,
bonds, obligations and other securities, except in connection with the
acquisition of a Guarantor in a Related Business) that in the good faith
reasonable judgment of the Company's Board of Directors will immediately
constitute or be a part of a Related Business of the Company or such Subsidiary
(if it continues to be a Subsidiary) immediately following such transaction; or

                  (b) used to retire Purchase Money Indebtedness secured by the
asset that was the subject of the Asset Sale or to permanently reduce the amount
of Indebtedness outstanding under the Credit Agreement; or

                  (c) applied to the optional redemption of the Notes in
accordance with the terms of this Indenture and the Company's other Indebtedness
ranking on a parity with the Notes and with similar provisions requiring the
Company to redeem such Indebtedness with the proceeds from such Asset Sale, pro
rata in proportion to the respective principal amounts (or accreted values in
the case of Indebtedness issued with an original issue discount) of the Notes
and such other Indebtedness then outstanding.

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Pending the final application of any Net Cash Proceeds, the Company may
temporarily reduce revolving credit borrowings or otherwise invest the Net Cash
Proceeds in any manner that is not prohibited by this Indenture.

                  The accumulated Net Cash Proceeds from Asset Sales not applied
as set forth in (a), (b) or (c) of the preceding paragraph shall constitute
"Excess Proceeds". Within 30 days after the date that the amount of Excess
Proceeds exceeds $10,000,000, the Company shall apply the Excess Proceeds (the
"Asset Sale Offer Amount") to the repurchase of the Notes and such other
Indebtedness ranking on a parity with the Notes and with similar provisions
requiring the Company to make an offer to purchase such Indebtedness with the
proceeds from such Asset Sale pursuant to a cash offer (subject only to
conditions required by applicable law, if any) (pro rata in proportion to the
respective principal amounts (or accreted values in the case of Indebtedness
issued with an original issue discount) of the Notes and such other Indebtedness
then outstanding) (the "Asset Sale Offer") at a purchase price of 100% of the
principal amount (or accreted value in the case of Indebtedness issued with an
original issue discount) (the "Asset Sale Offer Price") together with accrued
and unpaid interest and Liquidated Damages, if any, to the date of payment. Each
Asset Sale Offer shall remain open for 20 Business Days following its
commencement (the "Asset Sale Offer Period").

                  Upon expiration of the Asset Sale Offer Period, the Company
shall apply the Asset Sale Offer Amount plus an amount equal to accrued and
unpaid interest and Liquidated Damages, if any, to the purchase of all
Indebtedness properly tendered in accordance with the provisions hereof (on a
pro rata basis if the Asset Sale Offer Amount is insufficient to purchase all
Indebtedness so tendered) at the Asset Sale Offer Price (together with accrued
interest and Liquidated Damages, if any). To the extent that the aggregate
amount of Notes and such other pari passu Indebtedness tendered pursuant to an
Asset Sale Offer is less than the Asset Sale Offer Amount, the Company may use
any remaining Net Cash Proceeds as otherwise permitted by this Indenture (other
than for making Restricted Payments that are not Investments) and following the
consummation of each Asset Sale Offer the Excess Proceeds amount shall be reset
to zero.

         Notwithstanding, and without complying with, the provisions of this
Section 4.14:

                  (1) the Company may and its Subsidiaries may, in the ordinary
         course of business, (a) convey, sell, transfer, assign or otherwise
         dispose of inventory and other assets acquired and held for resale in
         the ordinary course of business and (b) liquidate Cash Equivalents;

                  (2) the Company may and its Subsidiaries may convey, sell,
         transfer, assign or otherwise dispose of assets pursuant to and in
         accordance with Article V;

                  (3) the Company may and its Subsidiaries may sell or dispose
         of damaged, worn out or other obsolete personal property in the
         ordinary course of business so long

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<PAGE>

         as such property is no longer necessary for the proper conduct of the
         Company's business or the business of such Subsidiary, as applicable;

                  (4) the Guarantors may convey, sell, transfer, assign or
         otherwise dispose of assets to the Company or any Guarantor;

                  (5) the Company may and its Subsidiaries may convey, sell,
         transfer, assign, or otherwise dispose of assets (or related assets or
         in related transactions) with a fair market value of less than
         $250,000;

                  (6) the Company may and each of its Subsidiaries may surrender
         or waive contract rights or settle, release or surrender contract, tort
         or other litigation claims in the ordinary course of business or grant
         (or permit realization of) Liens not prohibited by this Indenture;

                  (7) the Company may and the Company's Subsidiaries may make
         Permitted Investments (excluding clause (o) in the definition thereof)
         and Restricted Investments under Section 4.3; and

                  (8) the Company may and the Company's Subsidiaries may
         exchange assets held by the Company or such Subsidiaries for assets
         held by any Person or entity; provided, that (a) the assets received by
         the Company or such Subsidiaries in any such exchange in the good faith
         reasonable judgment of the Company's Board of Directors will
         immediately constitute, be a part of, or be used in, a Related Business
         of the Company or such Subsidiaries, (b) the Company's Board of
         Directors has determined that the terms of any exchange are fair and
         reasonable, (c) any such exchange shall be deemed to be an Asset Sale
         to the extent that the Company or any of the Company's Subsidiaries
         receives cash or Cash Equivalents in such exchange, and (d) that, in
         the case of a transaction exceeding $10,000,000 of consideration to any
         party thereto, the Company shall have obtained a favorable written
         opinion by an independent financial advisor of national reputation in
         the United States as to the fairness from a financial point of view to
         the Company or such Subsidiary of the proposed transaction.

                  In addition to the foregoing and notwithstanding anything
herein to the contrary, (A) the Company shall not, and shall not permit any of
its Subsidiaries to, directly or indirectly make any Asset Sale of any of the
Equity Interests of any of the Company's Subsidiaries (other than to the Company
or to a Guarantor) except (i) pursuant to an Asset Sale of all the Equity
Interests of such Subsidiary, (ii) for an Asset Sale of Equity Interests with no
preferences or special rights or privileges and with no redemption or prepayment
provisions, provided, that after such sale the Company or the Company's
Subsidiaries own a majority of the voting and economic Equity Interests of such
Subsidiary, (iii) to the extent such shares represent directors' qualifying
shares or shares required by applicable law to be held by a Person other than
the Company or a Wholly Owned Subsidiary of the Company, and (B) in the event of
the transfer of substantially all (but not all) of the assets of the Company and
its Subsidiaries as an entirety

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to a Person in a transaction covered by and effected in accordance with Article
V, the successor corporation shall be deemed to have sold for cash at fair
market value the assets of the Company and its Subsidiaries not so transferred
for purposes of this Section 4.14, and shall comply with the provisions of this
section with respect to such deemed sale as if it were an Asset Sale (with such
fair market value being deemed to be Net Cash Proceeds for such purpose).

                  Any Asset Sale Offer shall be made in compliance with all
applicable laws, rules, and regulations, including, if applicable, Regulation
14E of the Exchange Act and the rules and regulations thereunder and all other
applicable Federal and state securities laws. To the extent that the provisions
of any securities laws or regulations conflict with the provisions of this
Section 4.14, the Company's compliance or the compliance of any of the Company's
Subsidiaries with such laws and regulations shall not in and of itself cause a
breach of the Company's obligations under this Section 4.14.

                  If the payment date in connection with an Asset Sale Offer
hereunder is on or after an interest payment Record Date and on or before the
associated Interest Payment Date, any accrued and unpaid interest (and
Liquidated Damages, if any, due on such Interest Payment Date) will be paid to
the Person in whose name a Note is registered at the close of business on such
Record Date.

                  Notice of an Asset Sale Offer shall be sent, on or prior to
the commencement of the Asset Sale Offer, by first-class mail, by the Company to
each Holder at its registered address, with a copy to the Trustee. The notice to
the Holders shall contain all information, instructions and materials required
by applicable law or otherwise material to such Holders' decision to tender
Notes pursuant to the Asset Sale Offer. The notice, which (to the extent
consistent with this Indenture) shall govern the terms of an Asset Sale Offer,
shall state:

                  (1) that the Asset Sale Offer is being made pursuant to such
         notice and this Section 4.14;

                  (2) the Asset Sale Offer Amount, the Asset Sale Offer Price
         (including the amount of accrued but unpaid interest (and Liquidated
         Damages, if any)), and the date of purchase;

                  (3) that any Note or portion thereof not tendered or accepted
         for payment will continue to accrue interest (and Liquidated Damages,
         if any) if interest (and Liquidated Damages, if any) is then accruing;

                  (4) that, unless the Company defaults in depositing cash with
         the Paying Agent (which may not for purposes of this Section 4.14,
         notwithstanding anything in this Indenture to the contrary, be the
         Company or any Affiliate of the Company) in accordance with the last
         paragraph of this Section 4.14, any Note, or portion thereof, accepted
         for payment pursuant to the Asset Sale Offer shall cease to accrue
         interest (and Liquidated Damages, if any) after the payment date in
         connection with an Asset Sale;

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<PAGE>

                  (5) that Holders electing to have a Note, or portion thereof,
         purchased pursuant to an Asset Sale Offer will be required to surrender
         their Note, with the form entitled "Option of Holder to Elect Purchase"
         on the reverse of the Note completed, to the Paying Agent (which may
         not for purposes of this Section 4.14, notwithstanding any other
         provision of this Indenture, be the Company or any Affiliate of the
         Company) at the address specified in the notice;

                  (6) that Holders will be entitled to withdraw their elections,
         in whole or in part, if the Paying Agent receives, prior to the
         expiration of the Asset Sale Offer, a facsimile transmission or letter
         setting forth the name of the Holder, the principal amount of the Notes
         the Holder is withdrawing and a statement containing a facsimile
         signature and stating that such Holder is withdrawing his election to
         have such principal amount of the Notes purchased;

                  (7) that if Indebtedness in an aggregate principal amount in
         excess of the aggregate principal amount of Notes to be acquired
         pursuant to the Asset Sale Offer is tendered and not withdrawn, the
         Company shall purchase such Indebtedness on a pro rata basis in
         proportion to the respective principal amounts (or accreted values in
         the case of Indebtedness issued with an original issue discount)
         thereof (with such adjustments as may be deemed appropriate by the
         Company so that only Notes in denominations of $1,000 or integral
         multiples of $1,000 shall be acquired);

                  (8) that Holders whose Notes were purchased only in part will
         be issued new Notes equal in principal amount to the unpurchased
         portion of the Notes surrendered; and

                  (9) the circumstances and relevant facts regarding such Asset
         Sale.

                  On or before the date of purchase, the Company shall (i)
accept for payment Notes or portions thereof properly tendered pursuant to the
Asset Sale Offer (on a pro rata basis if required pursuant to paragraph (7)
above), (ii) deposit with the Paying Agent cash sufficient to pay the Asset Sale
Offer Price for all Notes or portions thereof so accepted and (iii) deliver to
the Trustee Notes so accepted together with an Officers' Certificate setting
forth the Notes or portions thereof being purchased by the Company. The Paying
Agent shall promptly mail or deliver to Holders of Notes so accepted payment in
an amount equal to the Asset Sale Offer Price for such Notes, and the Trustee
shall promptly authenticate and mail or deliver to such Holders a new Note equal
in principal amount to any unpurchased portion of the Note surrendered. Any
Notes not so accepted shall be promptly mailed or delivered by the Company to
the Holder thereof.

SECTION 4.15. WAIVER OF STAY, EXTENSION OR USURY LAWS

                  Each of the Company and the Guarantors covenants (to the
extent that it may lawfully do so) that it shall not at any time insist upon,
plead, or in any manner whatsoever

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<PAGE>

claim or take the benefit or advantage of, any stay or extension law or any
usury law or other law which would prohibit or forgive the Company or any
Guarantor from paying all or any portion of the principal of, premium of, or
interest (or Liquidated Damages, if any) on the Notes as contemplated herein,
wherever enacted, now or at any time hereafter in force, or which may affect the
covenants or the performance of this Indenture; and (to the extent that it may
lawfully do so) each of the Company and the Guarantors hereby expressly waives
all benefit or advantage of any such law and covenants that it shall not hinder,
delay or impede the execution of any power herein granted to the Trustee, but
shall suffer and permit the execution of every such power as though no such law
had been enacted.

SECTION 4.16. LIMITATION ON LIENS SECURING INDEBTEDNESS

                  The Company and the Guarantors shall not, and neither the
Company nor the Guarantors shall permit any of their respective Subsidiaries to,
create, incur, assume or suffer to exist any Lien of any kind, other than
Permitted Liens, upon any of their respective assets now owned or acquired on or
after the date of this Indenture or upon any income or profits therefrom, unless
the Company provides, and causes its Subsidiaries to provide, concurrently
therewith, that the Notes and the applicable Guarantees are equally and ratably
so secured; provided, that if such Indebtedness is Subordinated Indebtedness,
the Lien securing such Subordinated Indebtedness shall be contractually
subordinate and junior to the Lien securing the Notes (and any related
applicable Guarantees) with the same relative priority as such Subordinated
Indebtedness shall have with respect to the Notes (and any related applicable
Guarantees).

SECTION 4.17. LIMITATIONS ON LINES OF BUSINESS

                  Neither the Company nor any of its Subsidiaries shall directly
or indirectly engage to any substantial extent in any line or lines of business
activity other than that which, in the reasonable good faith judgment of the
Company's Board of Directors, is a Related Business.

SECTION 4.18. SALE AND LEASEBACK TRANSACTIONS

                  The Company will not, and will not permit any of its
Subsidiaries to, enter into any sale and leaseback transaction; provided that
the Company and its Subsidiaries may enter into a sale and leaseback transaction
if:

                  (1) the Company or such Subsidiary could have (a) incurred
         Indebtedness in an amount equal to the Attributable Indebtedness
         relating to such sale and leaseback transaction under the Debt
         Incurrence Ratio in the second paragraph of Section 4.11 and (b)
         incurred a Lien to secure such Indebtedness pursuant to the covenant
         described in Section 4.16;

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<PAGE>

                  (2) the gross cash proceeds of such sale and leaseback
         transaction are at least equal to the fair market value, as determined
         in good faith by the Board of Directors and set forth in an Officers'
         Certificate delivered to the Trustee, of the property that is the
         subject of such sale and leaseback transaction; and

                  (3) the transfer of assets in such sale and leaseback
         transaction is permitted by, and the Company applies the proceeds of
         such transaction in compliance with, Section 4.14.

SECTION 4.19. LIMITATION ON CASH INTEREST PAYMENTS ON CONVERTIBLE NOTE

                  Scheduled interest payments in respect of the Convertible Note
shall be paid in kind pursuant to the terms thereof, unless the Company's
Consolidated Coverage Ratio for the Reference Period immediately preceding the
date of such interest payment is at least equal to the Debt Incurrence Ratio, in
which case, such scheduled interest payments shall be payable, at the Company's
option, in cash pursuant to the terms thereof.

SECTION 4.20. DESIGNATION OF UNRESTRICTED SUBSIDIARIES

                  (a) The Board of Directors of the Company may designate any
Subsidiary (including any newly acquired or newly formed Subsidiary) that does
not directly, indirectly or beneficially own any Capital Stock of, or
Subordinated Indebtedness of, or own or hold any Lien on any property of, the
Company or any other Subsidiary of the Company, to be an Unrestricted Subsidiary
so long as (a) such Subsidiary at the time of such designation: (i) has no
Indebtedness other than Non-Recourse Indebtedness; provided, that the Company or
a Subsidiary of the Company may guarantee Indebtedness of an Unrestricted
Subsidiary so long as any such guarantee constitutes an Investment made pursuant
to clause (f) of the definition of Permitted Investment; (ii) is not party to
any agreement, contract, arrangement or understanding with the Company or any
Subsidiary of the Company unless the terms of any such agreement, contract,
arrangement or understanding are no less favorable to the Company or such
Subsidiary than those that might be obtained at the time from Persons who are
not Affiliates of the Company; (iii) is a Person with respect to which neither
the Company nor any of its Subsidiaries has any direct or indirect obligation
(x) to subscribe for additional Equity Interests, except to the extent that any
such Investment made for such purpose constitutes an Investment made pursuant to
clause (f) of the definition of Permitted Investment, or (y) to maintain or
preserve such Person's financial condition or to cause such Person to achieve
any specified levels of operating results; and (iv) has not guaranteed or
otherwise directly or indirectly provided credit support for any Indebtedness of
the Company or any of its Subsidiaries; and (b) each Subsidiary of such
Subsidiary shall also be designated an Unrestricted Subsidiary and shall comply
with clause (a) above.

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<PAGE>

                  (b) The Board of Directors of the Company may designate any
Unrestricted Subsidiary to be a Subsidiary, provided, that (a) no Default or
Event of Default is existing or will occur as a consequence thereof and (b)
immediately after giving effect to such designation, on a pro forma basis, the
Company could incur at least $1.00 of Indebtedness pursuant to the Debt
Incurrence Ratio.

                  (c) Each such designation shall be evidenced by filing with
the Trustee a certified copy of the resolution giving effect to such designation
and an Officers' Certificate certifying that such designation complied with the
foregoing conditions.

                                    ARTICLE V

                              SUCCESSOR CORPORATION

SECTION 5.1. LIMITATION ON MERGER, SALE OR CONSOLIDATION

                  The Company shall not consolidate with or merge with or into
another Person or, directly or indirectly, sell, lease, convey or transfer all
or substantially all of its assets (such amounts to be computed on a
consolidated basis), whether in a single transaction or a series of related
transactions, to another Person or group of affiliated Persons, unless:

                  (1) either (a) the Company is the continuing entity or (b) the
         resulting, surviving or transferee entity or, in the case of a plan of
         liquidation, the entity which receives the greatest value from such
         plan of liquidation is a corporation organized under the laws of the
         United States, any state thereof or the District of Columbia and
         expressly assumes by supplemental indenture all of the Company's
         obligations in connection with the Notes and this Indenture;

                  (2) no Default or Event of Default shall exist or shall occur
         immediately after giving effect on a pro forma basis to such
         transaction;

                  (3) immediately after giving effect to such transaction on a
         pro forma basis, the Consolidated Net Worth of the consolidated
         surviving or transferee entity or, in the case of a plan of
         liquidation, the entity which receives the greatest value from such
         plan of liquidation is at least equal to the Company's Consolidated Net
         Worth immediately prior to such transaction;

                  (4) unless such transaction is solely the merger of the
         Company and one of the Company's previously existing Guarantors for the
         purpose of reincorporation into another jurisdiction and which
         transaction is not for the purpose of evading this provision and not in
         connection with any other transaction, immediately after giving effect
         to such transaction on a pro forma basis, the consolidated resulting,
         surviving or transferee entity or, in the case of a plan of
         liquidation, the entity which receives the

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<PAGE>

         greatest value from such plan of liquidation would immediately
         thereafter be permitted to incur at least $1.00 of additional
         Indebtedness pursuant to the Debt Incurrence Ratio; and

                  (5) each Guarantor, shall have by amendment to its Guarantee
         and this Indenture confirmed in writing that its Guarantee shall apply
         to the obligations of the Company or the surviving entity in accordance
         with the Notes and this Indenture.

                  For purposes of the foregoing, the transfer (by lease,
assignment, sale or otherwise) of all or substantially all of the properties and
assets of one or more Subsidiaries, the Company's interest in which constitutes
all or substantially all of the Company's properties and assets, shall be deemed
to be the transfer of all or substantially all of the Company's properties and
assets.

SECTION 5.2. SUCCESSOR CORPORATION SUBSTITUTED

                  Upon any consolidation or merger or any transfer of all or
substantially all of the assets of the Company in accordance with Section 5.1,
the successor entity formed by such consolidation or into which the Company is
merged or to which such transfer is made shall succeed to and (except in the
case of a lease or any transfer of all or substantially all of the Company's
assets) be substituted for, and may exercise every right and power of, the
Company under this Indenture with the same effect as if such successor entity
had been named therein as the Company, and (except in the case of a lease or any
transfer or all or substantially all of the Company's assets) the Company shall
be released from the obligations under the Notes and this Indenture except with
respect to any obligations that arise from, or are related to, such transaction.

                                   ARTICLE VI

                         EVENTS OF DEFAULT AND REMEDIES

SECTION 6.1. EVENTS OF DEFAULT

                  "Event of Default," wherever used herein, means any one of the
following events (whatever reason for such Event of Default and whether it shall
be caused voluntarily or involuntarily or effected, without limitation, by
operation of law or pursuant to any judgment, decree or order of any court or
any order, rule or regulation of any administrative or governmental body)

                  (1) the Company's failure to pay any installment of interest
         (or Liquidated Damages, if any) on the Notes as and when the same
         becomes due and payable and the continuance of any such failure for 30
         days;

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<PAGE>

                  (2) the Company's failure to pay all or any part of the
         principal, or premium, if any, on the Notes when and as the same
         becomes due and payable at maturity, redemption, by acceleration or
         otherwise, including, without limitation, payment of the Change of
         Control Purchase Price or the Asset Sale Offer Price, on Notes validly
         tendered and not properly withdrawn pursuant to a Change of Control
         Offer or Asset Sale Offer, as applicable;

                  (3) the Company's failure or the failure by any of its
         Subsidiaries to observe or perform any other covenant or agreement
         contained in the Notes or this Indenture and, except for the provisions
         under Sections 4.3 and 4.14, and Articles V and X, the continuance of
         such failure for a period of 60 days after written notice is given to
         the Company by the Trustee or to the Company and the Trustee by the
         Holders of at least 25% in aggregate principal amount of the Notes
         outstanding;

                  (4) a decree, judgment, or order by a court of competent
         jurisdiction shall have been entered adjudicating the Company or any of
         its Significant Subsidiaries as bankrupt or insolvent, or approving as
         properly filed a petition seeking reorganization of the Company or any
         of its Significant Subsidiaries under any bankruptcy or similar law,
         and such decree or order shall have continued undischarged and unstayed
         for a period of 60 days; or a decree, judgment or order of a court of
         competent jurisdiction appointing a receiver, liquidator, trustee, or
         assignee in bankruptcy or insolvency for the Company, any of its
         Significant Subsidiaries, or any substantial part of the property of
         any such Person, or for the winding up or liquidation of the affairs of
         any such Person, shall have been entered, and such decree, judgment, or
         order shall have remained in force undischarged and unstayed for a
         period of 60 days;

                  (5) the Company or any of its Significant Subsidiaries shall
         institute proceedings to be adjudicated a voluntary bankrupt, or shall
         consent to the filing of a bankruptcy proceeding against it, or shall
         file a petition or answer or consent seeking reorganization under any
         bankruptcy or similar law or similar statute, or shall consent to the
         filing of any such petition, or shall consent to the appointment of a
         custodian, receiver, liquidator, trustee, or assignee in bankruptcy or
         insolvency of it or any substantial part of its assets or property, or
         shall make a general assignment for the benefit of creditors, or shall
         admit in writing its inability to pay its debts generally as they
         become due, or take any corporate action in furtherance of any of the
         foregoing;

                  (6) a default in the Company's Indebtedness or the
         Indebtedness any of its Subsidiaries with an aggregate amount
         outstanding in excess of $10,000,00 (a) resulting from the failure to
         pay principal at maturity or (b) as a result of which the maturity of
         such Indebtedness has been accelerated prior to its stated maturity;

                  (7) final unsatisfied judgments not covered by insurance
         aggregating in excess of $5,000,000, at any one time rendered against
         the Company or any of its Subsidiaries and not stayed, bonded or
         discharged within 60 days; and

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<PAGE>

                  (8) any Guarantee of a Guarantor that is a Significant
         Subsidiary ceases to be in full force and effect or becomes
         unenforceable or invalid or is declared null and void (other than in
         accordance with the terms of the Guarantee and this Indenture) or any
         Guarantor denies or disaffirms its obligations under its Guarantee.

SECTION 6.2. ACCELERATION OF MATURITY DATE; RESCISSION AND ANNULMENT

                  If an Event of Default occurs and is continuing (other than an
Event of Default specified in Section 6.1(4) or Section 6.1(5) relating to the
Company or any of its Significant Subsidiaries,) then in every such case, unless
the principal of all of the Notes shall have already become due and payable,
either the Trustee or the Holders of at least 25% in aggregate principal amount
of the Notes then outstanding, by notice in writing to the Company (and to the
Trustee if given by Holders) (an "Acceleration Notice"), may declare all
principal, determined as set forth below, and accrued interest (and Liquidated
Damages, if any) thereon to be due and payable immediately.

                   If an Event of Default specified in Section 6.1(4) or Section
6.1(5), relating to the Company or any of its Significant Subsidiaries occurs,
all principal and accrued interest (and Liquidated Damages, if any) thereon will
be immediately due and payable on all outstanding Notes without any declaration
or other act on the part of the Trustee or the Holders. The Holders of a
majority in aggregate principal amount of the then outstanding Notes, by written
notice to the Trustee, may rescind any acceleration and its consequences if the
rescission would not conflict with any judgment or decree and if all existing
Events of Default, other than the non-payment of the principal of, premium, if
any, and interest, if any, on the Notes that have become due solely because of
the acceleration, and except a Default with respect to any provision requiring a
supermajority approval to amend, which Default may only be waived by such a
supermajority, have been cured or waived as provided in Section 6.12.

SECTION 6.3. COLLECTION OF INDEBTEDNESS AND SUITS FOR ENFORCEMENT BY TRUSTEE

                  The Company covenants that if an Event of Default in payment
of principal, premium or interest specified in clause (1) or (2) of Section 6.1
hereof occurs and is continuing, the Company shall, upon demand of the Trustee,
pay to it, for the benefit of the Holders of such Notes, the whole amount then
due and payable on such Notes for principal, premium (if any), and interest (and
Liquidated Damages, if any), and, to the extent that payment of such interest
shall be legally enforceable, interest on any overdue principal (and premium, if
any), and on any overdue interest (and Liquidated Damages, if any), at the rate
borne by the Notes, and, in addition thereto, such further amount as shall be
sufficient to cover the costs and expenses of collection, including compensation
to, and expenses, disbursements and advances of the Trustee and its agents and
counsel and all other amounts due the Trustee under Section 7.7.

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<PAGE>

                  If the Company fails to pay such amounts forthwith upon such
demand, the Trustee, in its own name and as trustee of an express trust in favor
of the Holders, may institute a judicial proceeding for the collection of the
sums so due and unpaid, may prosecute such proceeding to judgment or final
decree and may enforce the same against the Company or any other obligor upon
the Notes and collect the moneys adjudged or decreed to be payable in the manner
provided by law out of the property of the Company or any other obligor upon the
Notes, wherever situated.

                  If an Event of Default occurs and is continuing, the Trustee
may in its discretion proceed to protect and enforce its rights and the rights
of the Holders by such appropriate judicial proceedings as the Trustee shall
deem most effective to protect and enforce any such rights, whether for the
specific enforcement of any covenant or agreement in this Indenture or in aid of
the exercise of any power granted herein, or to enforce any other proper remedy.

SECTION 6.4. TRUSTEE MAY FILE PROOFS OF CLAIM

                  In case of the pendency of any receivership, insolvency,
liquidation, bankruptcy, reorganization, arrangement, adjustment, composition or
other judicial proceeding relative to the Company or any other obligor upon the
Notes or the property of the Company or of such other obligor or their
creditors, the Trustee (irrespective of whether the principal of the Notes shall
then be due and payable as therein expressed or by declaration or otherwise and
irrespective of whether the Trustee shall have made any demand on the Company
for the payment of overdue principal, premium, if any, or interest (and
Liquidated Damages, if any)) shall be entitled and empowered, by intervention in
such proceeding or otherwise to take any and all actions under the TIA,
including

                  (1) to file and prove a claim for the whole amount of
         principal (and premium, if any) and interest (and Liquidated Damages,
         if any) owing and unpaid in respect of the Notes and to file such other
         papers or documents as may be necessary or advisable in order to have
         the claims of the Trustee (including any claim for the reasonable
         compensation, expenses, disbursements and advances of the Trustee and
         its agent and counsel and all other amounts due the Trustee under
         Section 7.7) and of the Holders allowed in such judicial proceeding,
         and

                  (2) to collect and receive any moneys or other property
         payable or deliverable on any such claims and to distribute the same;

and any custodian, receiver, assignee, trustee, liquidator, sequestrator or
other similar official in any such judicial proceeding is hereby authorized by
each Holder to make such payments to the Trustee and, in the event that the
Trustee shall consent to the making of such payments directly to the Holders, to
pay to the Trustee any amount due it for the reasonable compensation, expenses,
disbursements and advances of the Trustee and its agents and counsel, and any
other amounts due the Trustee under Section 7.7 hereof.

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                  Nothing herein contained shall be deemed to authorize the
Trustee to authorize or consent to or accept or adopt on behalf of any Holder
any plan of reorganization, arrangement, adjustment or composition affecting the
Notes or the rights of any Holder thereof or to authorize the Trustee to vote in
respect of the claim of any Holder in any such proceeding.

SECTION 6.5. TRUSTEE MAY ENFORCE CLAIMS WITHOUT POSSESSION OF NOTES

                  All rights of action and claims under this Indenture or the
Notes may be prosecuted and enforced by the Trustee without the possession of
any of the Notes or the production thereof in any proceeding relating thereto,
and any such proceeding instituted by the Trustee shall be brought in its own
name as trustee of an express trust in favor of the Holders, and any recovery of
judgment shall, after provision for the payment of compensation to, and
expenses, disbursements and advances of the Trustee and its agents and counsel
and all other amounts due the Trustee under Section 7.7, be for the ratable
benefit of the Holders of the Notes in respect of which such judgment has been
recovered.

SECTION 6.6. PRIORITIES

                  Any money collected by the Trustee pursuant to this Article VI
shall be applied in the following order, at the date or dates fixed by the
Trustee and, in case of the distribution of such money on account of principal,
premium (if any), or interest (or Liquidated Damages, if any), upon presentation
of the Notes and the notation thereon of the payment if only partially paid and
upon surrender thereof if fully paid:

                  FIRST: To the Trustee in payment of all amounts due pursuant
to Section 7.7 hereof;

                  SECOND: To the Holders in payment of the amounts then due and
unpaid for principal of, premium (if any), and interest (and Liquidated Damages,
if any) on, the Notes in respect of which or for the benefit of which such money
has been collected, ratably, without preference or priority of any kind,
according to the amounts due and payable on such Notes for principal, premium
(if any), and interest (and Liquidated Damages, if any), respectively; and

                  THIRD: To the Company, the Guarantors or such other Person as
may be lawfully entitled thereto, the remainder, if any, each as their
respective interests may appear.

                  The Trustee may, but shall not be obligated to, fix a record
date and payment date for any payment to the Holders under this Section 6.6.

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SECTION 6.7. LIMITATION ON SUITS

                  No Holder of any Note shall have any right to order or direct
the Trustee to institute any proceeding, judicial or otherwise, with respect to
this Indenture, or for the appointment of a receiver or trustee, or for any
other remedy hereunder, unless

                                    (A) such Holder has previously given written
                  notice to the Trustee of a continuing Event of Default;

                                    (B) the Holders of not less than 25% in
                  aggregate principal amount of then outstanding Notes shall
                  have made written request to the Trustee to institute
                  proceedings in respect of such Event of Default in its own
                  name as Trustee hereunder;

                                    (C) such Holder or Holders have offered to
                  the Trustee security or indemnity reasonably satisfactory to
                  it against the costs, expenses and liabilities to be incurred
                  or reasonably probable to be incurred in compliance with such
                  request;

                                    (D) the Trustee for 60 days after its
                  receipt of such notice, request and offer of indemnity has
                  failed to institute any such proceeding; and

                                    (E) no direction inconsistent with such
                  written request has been given to the Trustee during such
                  60-day period by the Holders of a majority in aggregate
                  principal amount of the outstanding Notes;

it being understood and intended that no one or more Holders shall have any
right in any manner whatsoever by virtue of, or by availing of, any provision of
this Indenture to affect, disturb or prejudice the rights of any other Holders,
or to obtain or to seek to obtain priority or preference over any other Holders
or to enforce any right under this Indenture, except in the manner herein
provided and for the equal and ratable benefit of all the Holders.

SECTION 6.8. UNCONDITIONAL RIGHT OF HOLDERS TO RECEIVE PRINCIPAL, PREMIUM AND
             INTEREST

                  Notwithstanding any other provision of this Indenture, the
Holder of any Note shall have the right, which is absolute and unconditional, to
receive payment of the principal of, and premium (if any), and interest (and
Liquidated Damages, if any) on, such Note on the Maturity Dates of such payments
as expressed in such Note (in the case of redemption, the Redemption Price on
the applicable Redemption Date, in the case of a Change of Control, the Change
of Control Purchase Price on the Change of Control Purchase Date, and in the
case of an Asset Sale, the Asset Sale Offer Price on the relevant purchase date)
and to institute suit for the enforcement of any such payment after such
respective dates, and such rights shall not be impaired without the consent of
such Holder.

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SECTION 6.9. RIGHTS AND REMEDIES CUMULATIVE

                  Except as otherwise provided with respect to the replacement
or payment of mutilated, destroyed, lost or stolen Notes in Section 2.7 hereof,
no right or remedy herein conferred upon or reserved to the Trustee or to the
Holders is intended to be exclusive of any other right or remedy, and every
right and remedy shall, to the extent permitted by law, be cumulative and in
addition to every other right and remedy given hereunder or now or hereafter
existing at law or in equity or otherwise. The assertion or employment of any
right or remedy hereunder, or otherwise, shall not prevent the concurrent
assertion or employment of any other appropriate right or remedy.

SECTION 6.10. DELAY OR OMISSION NOT WAIVER

                  No delay or omission by the Trustee or by any Holder of any
Note to exercise any right or remedy arising upon any Event of Default shall
impair the exercise of any such right or remedy or constitute a waiver of any
such Event of Default. Every right and remedy given by this Article VI or by law
to the Trustee or to the Holders may be exercised from time to time, and as
often as may be deemed expedient, by the Trustee or by the Holders, as the case
may be.

SECTION 6.11. CONTROL BY HOLDERS

                  The Holder or Holders of a majority in aggregate principal
amount of then outstanding Notes shall have the right to direct the time, method
and place of conducting any proceeding for any remedy available to the Trustee
or exercising any trust or power conferred upon the Trustee, provided, that:

                  (1) such direction shall not be in conflict with any
         applicable rule of law or with this Indenture;

                  (2) the Trustee shall not determine that the action so
         directed would be unjustly prejudicial to the Holders not taking part
         in such direction; and

                  (3) the Trustee may take any other action deemed proper by the
         Trustee which is not inconsistent with such direction.

SECTION 6.12. WAIVER OF EXISTING OR PAST DEFAULT

                  Subject to Section 6.8, the Holder or Holders of not less than
a majority in aggregate principal amount of the outstanding Notes may, on behalf
of all Holders, waive any existing or past Default and its consequences under
this Indenture, except a continuing Default

                                    (A) with respect to any provision requiring
                  a supermajority approval to amend, which Default may only be
                  waived by such supermajority; or

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                                    (B) in the payment of the principal of, or
                  interest on, any Note as specified in clauses (1) and (2) of
                  Section 6.1 hereof and not yet cured; or

                                    (C) with respect to any covenant or
                  provision hereof which, under Article IX, cannot be modified
                  or amended without the consent of the Holder of each
                  outstanding Note affected.

                  Upon any such waiver, such Default shall cease to exist, and
any Event of Default arising therefrom shall be deemed to have been cured for
every purpose of this Indenture, but no such waiver shall extend to any
subsequent or other Default or impair the exercise of any right arising from
such Default or Event of Default.

SECTION 6.13. UNDERTAKING FOR COSTS

                  All parties to this Indenture agree, and each Holder of any
Note by his acceptance thereof shall be deemed to have agreed, that in any suit
for the enforcement of any right or remedy under this Indenture, or in any suit
against the Trustee for any action taken, suffered or omitted to be taken by it
as Trustee, any court may in its discretion require the filing by any party
litigant in such suit of an undertaking to pay the costs of such suit, and that
such court may in its discretion assess reasonable costs, including reasonable
attorneys' fees and expenses, against any party litigant in such suit, having
due regard to the merits and good faith of the claims or defenses made by such
party litigant; but the provisions of this Section 6.13 shall not apply to any
suit instituted by the Company, to any suit instituted by the Trustee, to any
suit instituted by any Holder, or group of Holders, holding in the aggregate
more than 10% in aggregate principal amount of the outstanding Notes, or to any
suit instituted by any Holder for enforcement of the payment of principal of, or
premium (if any), or interest (or Liquidated Damages, if any) on, any Note on or
after the respective Maturity Date expressed in such Note (including, in the
case of redemption, on or after the Redemption Date).

SECTION 6.14. RESTORATION OF RIGHTS AND REMEDIES

                  If the Trustee or any Holder has instituted any proceeding to
enforce any right or remedy under this Indenture and such proceeding has been
discontinued or abandoned for any reason, or has been determined adversely to
the Trustee or to such Holder, then and in every case, subject to any
determination in such proceeding, the Company, the Guarantors, the Trustee and
the Holders shall be restored severally and respectively to their former
positions hereunder and thereafter all rights and remedies of the Trustee and
the Holders shall continue as though no such proceeding had been instituted.

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                                   ARTICLE VII

                                     TRUSTEE

                  The Trustee hereby accepts the trust imposed upon it by this
Indenture and covenants and agrees to perform the same, as herein expressed,
subject to the terms hereof.

SECTION 7.1. DUTIES OF TRUSTEE

                  (a) If a Default or an Event of Default has occurred and is
continuing, the Trustee shall exercise such of the rights and powers vested in
it by this Indenture and use the same degree of care and skill in their exercise
as a prudent Person would exercise or use under the circumstances in the conduct
of his or her own affairs.

                  (b) Except during the continuance of a Default or an Event of
Default:

                  (1) the Trustee need perform only those duties as are
         specifically set forth in this Indenture and no others, and no
         covenants or obligations shall be implied in or read into this
         Indenture which are adverse to the Trustee, and

                  (2) in the absence of bad faith on its part, the Trustee may
         conclusively rely, as to the truth of the statements and the
         correctness of the opinions expressed therein, upon certificates or
         opinions furnished to the Trustee and conforming to the requirements of
         this Indenture. However, in the case of any such certificates or
         opinions which by any provision hereof are specifically required to be
         furnished to the Trustee, the Trustee shall examine the certificates
         and opinions to determine whether or not they conform to the
         requirements of this Indenture (but need not confirm or investigate the
         accuracy of mathematical calculations or other facts stated therein).

                  (c) The Trustee shall not be relieved from liability for its
own negligent action, its own negligent failure to act, or its own willful
misconduct, except that:

                  (1) this paragraph does not limit the effect of paragraph (b)
         of this Section 7.1;

                  (2) the Trustee shall not be liable for any error of judgment
         made in good faith by a Trust Officer, unless it is proved that the
         Trustee was negligent in ascertaining the pertinent facts; and

                  (3) the Trustee shall not be liable with respect to any action
         it takes or omits to take in good faith in accordance with a direction
         received by it pursuant to Section 6.11 hereof.

                  (d) No provision of this Indenture shall require the Trustee
to expend or risk its own funds or otherwise incur any financial liability in
the performance of any of its duties hereunder or to take or omit to take any
action under this Indenture or at the request, order or

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direction of the Holders or in the exercise of any of its rights or powers if it
shall have reasonable grounds for believing that repayment of such funds or
adequate indemnity against such risk or liability is not reasonably assured to
it.

                  (e) Every provision of this Indenture that in any way relates
to the Trustee is subject to paragraphs (a), (b), (c), (d) and (f) of this
Section 7.1.

                  (f) The Trustee shall not be liable for interest on any assets
received by it except as the Trustee may agree in writing with the Company
(including without limitation to the extent the Trustee receives funds prior to
the interest payment date in order to comply with the provisions of Section
4.1). Assets held in trust by the Trustee need not be segregated from other
assets except to the extent required by law.

SECTION 7.2. RIGHTS OF TRUSTEE

                  Subject to Section 7.1 hereof:

                  (a) In the absence of bad faith, the Trustee may conclusively
rely on any document reasonably believed by it to be genuine and to have been
signed or presented by the proper Person. The Trustee need not investigate any
fact or matter stated in such document.

                  (b) Before the Trustee acts or refrains from acting, it may
consult with counsel and may require an Officers' Certificate or an Opinion of
Counsel, which shall conform to Sections 12.4 and 12.5 hereof. The Trustee shall
not be liable for any action it takes or omits to take in good faith in reliance
on such certificate or advice of counsel.

                  (c) The Trustee may act through its attorneys and agents and
shall not be responsible for the misconduct or negligence of any agent appointed
with due care.

                  (d) The Trustee shall not be liable for any action it or its
agent takes or omits to take in good faith which it reasonably believes to be
authorized or within its rights or powers conferred upon it by this Indenture;
provided, however, that the Trustee's conduct does not constitute willful
misconduct or gross negligence.

                  (e) The Trustee shall not be bound to make any investigation
into the facts or matters stated in any resolution, certificate, statement,
instrument, opinion, notice, request, direction, consent, order, bond, debenture
or other paper or document, but the Trustee, in its discretion, may make such
further inquiry or investigation into such facts or matters as it may see fit.

                  (f) The Trustee shall be under no obligation to exercise any
of the rights or powers vested in it by this Indenture at the request, order or
direction of any of the Holders, pursuant to the provisions of this Indenture,
unless such Holders shall have offered to the

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Trustee reasonable security or indemnity reasonably satisfactory to it against
the costs, expenses and liabilities which may be incurred therein or thereby.

                  (g) Unless otherwise specifically provided for in this
Indenture, any demand, request, direction or notice from the Company or any
Guarantor shall be sufficient if signed by an Officer of the Company or such
Guarantor, as applicable.

                  (h) The Trustee shall have no duty to inquire as to the
performance of the Company's or any Guarantor's covenants in Article IV hereof
or as to the performance by any Agent of its duties hereunder. In addition, the
Trustee shall not be deemed to have knowledge of any Default or Event of Default
except (i) any Event of Default occurring pursuant to Sections 6.1(1), 6.1(2)
and 4.1 hereof, or (ii) any Default or Event of Default of which the Trustee
shall have received written notification or obtained actual knowledge.

                  (i) Whenever in the administration of this Indenture the
Trustee shall deem it desirable that a matter be proved or established prior to
taking, suffering or omitting any action hereunder, the Trustee (unless other
evidence be herein specifically prescribed) may, in the absence of bad faith on
its part, rely upon an Officers' Certificate, an Opinion of Counsel, or both.

                  (j) The Trustee may request that the Issuer or the Company
deliver an Officers' Certificate setting forth the names of individuals and/or
titles of officers authorized at such time to take specified actions pursuant to
this Indenture, which Officers' Certificate may be signed by any person
authorized to sign an Officers' Certificate, including any person specified as
so authorized in any such certificate previously delivered and not superseded.

SECTION 7.3. INDIVIDUAL RIGHTS OF TRUSTEE

                  The Trustee in its individual or any other capacity may become
the owner or pledgee of Notes and may otherwise deal with the Company, any
Guarantor, any of their Subsidiaries, or their respective Affiliates with the
same rights it would have if it were not Trustee. Any Agent may do the same with
like rights. However, the Trustee must comply with Sections 7.10 and 7.11
hereof.

SECTION 7.4. TRUSTEE'S DISCLAIMER

                  The Trustee makes no representation as to the validity or
adequacy of this Indenture or the Notes and it shall not be accountable for the
Company's use of the proceeds from the Notes, and it shall not be responsible
for any statement in the Notes, other than the Trustee's certificate of
authentication, or the use or application of any funds received by a Paying
Agent other than the Trustee.

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SECTION 7.5. NOTICE OF DEFAULT

                  If a Default or an Event of Default occurs and is continuing
and if it is known to the Trustee, the Trustee shall mail to each Securityholder
notice of the uncured Default or Event of Default within 90 days after such
Default or Event of Default occurs.

SECTION 7.6. REPORTS BY TRUSTEE TO HOLDERS

                  Within 60 days after each May 15 beginning with the May 15
following the date of this Indenture, the Trustee shall, if required by law,
mail to each Securityholder a brief report dated as of such May 15 that complies
with TIA Section 313(a). The Trustee also shall comply with TIA Sections 313(b)
and 313(c).

                  The Company shall promptly notify the Trustee in writing if
the Notes become listed on any stock exchange or automatic quotation system or
of any delisting thereof.

                  A copy of each report at the time of its mailing to
Securityholders shall be mailed to the Company and filed with the SEC and each
stock exchange, if any, on which the Notes are listed.

SECTION 7.7. COMPENSATION AND INDEMNITY

                  The Company and the Guarantors jointly and severally agree to
pay to the Trustee from time to time such compensation for its services as the
Company and the Trustee shall from time to time agree in writing. The Trustee's
compensation shall not be limited by any law on compensation of a trustee of an
express trust. The Company and the Guarantors shall reimburse the Trustee upon
request for all reasonable disbursements, expenses and advances incurred or made
by it in accordance with this Indenture. Such expenses shall include the
reasonable compensation, disbursements and expenses of the Trustee's agents,
accountants, experts and counsel.

                  The Company and the Guarantors jointly and severally agree to
indemnify each of the Trustee (in its capacity as Trustee) and each predecessor
Trustee and each of its officers, directors, attorneys-in-fact and agents for,
and hold it harmless against, any claim, demand, expense (including but not
limited to reasonable compensation, disbursements and expenses of the Trustee's
agents and counsel), loss or liability incurred by it without negligence or bad
faith on the part of the Trustee, arising out of or in connection with the
acceptance and the administration of this trust and its rights or duties
hereunder, including the reasonable costs and expenses of defending itself
against any claim or liability in connection with the exercise or performance of
any of its powers or duties hereunder. The Trustee shall notify the Company
promptly of any claim asserted against the Trustee for which it may seek
indemnity; provided, however, that any failure to so notify the Company shall
not relieve the Company or any Guarantor of its indemnity obligations hereunder.
The Company and the Guarantors shall defend the claim and the Trustee shall
provide reasonable cooperation at the Company's and the Guarantors' expense in
the defense. The Trustee may have separate counsel and the Company and the
Guarantors shall pay the reasonable fees and expenses of such counsel; provided,
that

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<PAGE>

the Company and the Guarantors will not be required to pay such fees and
expenses if they assume the Trustee's defense and if the Trustee is advised by
counsel that there is no conflict of interest between the Company and the
Guarantors and the Trustee in connection with such defense. The Company and the
Guarantors need not pay for any settlement made without their written consent,
which shall not be unreasonably withheld. The Company and the Guarantors need
not reimburse any expense or indemnify against any loss or liability to the
extent incurred by the Trustee through its negligence, bad faith or willful
misconduct.

                  To secure the Company's and the Guarantors' payment
obligations in this Section 7.7, the Trustee shall have a lien prior to the
Notes on all assets held or collected by the Trustee, in its capacity as
Trustee, except assets held in trust to pay principal and premium, if any, of or
interest on particular Notes.

                  When the Trustee incurs expenses or renders services after an
Event of Default specified in Section 6.1(4) or (5) of this Indenture occurs,
the expenses and the compensation for the services are intended to constitute
expenses of administration under any Bankruptcy Law.

                  The Company's and the Guarantors' obligations under this
Section 7.7 and any lien arising hereunder shall survive the resignation or
removal of the Trustee, the discharge of the Company's and the Guarantors'
obligations pursuant to Article VIII of this Indenture and any rejection or
termination of this Indenture under any Bankruptcy Law.

SECTION 7.8. REPLACEMENT OF TRUSTEE

                  The Trustee may resign by so notifying the Company in writing.
The Holder or Holders of a majority in aggregate principal amount of the
outstanding Notes may remove the Trustee by so notifying the Company and the
Trustee in writing and may appoint a successor trustee with the Company's
consent. The Company may remove the Trustee if:

                  (a) the Trustee fails to comply with Section 7.10 hereof;

                  (b) the Trustee is adjudged bankrupt or insolvent;

                  (c) a receiver, Custodian or other public officer takes charge
         of the Trustee or its property; or

                  (d) the Trustee becomes incapable of acting.

                  If the Trustee resigns or is removed or if a vacancy exists in
the office of Trustee for any reason, the Company shall promptly appoint a
successor Trustee. Within one year after the successor Trustee takes office, the
Holder or Holders of a majority in principal amount of the Notes may appoint a
successor Trustee to replace the successor Trustee appointed by the Company.

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                  A successor Trustee shall deliver a written acceptance of its
appointment to the retiring Trustee and to the Company. Immediately after that
and provided that all sums owing to the retiring Trustee provided for in Section
7.7 hereof have been paid, the retiring Trustee shall transfer all property held
by it as trustee to the successor Trustee, subject to the lien, if any, provided
in Section 7.7 hereof, the resignation or removal of the retiring Trustee shall
become effective, and the successor Trustee shall have all the rights, powers
and duties of the Trustee under this Indenture. A successor Trustee shall mail
notice of its succession to each Holder.

                  If a successor Trustee does not take office within 60 days
after the retiring Trustee resigns or is removed, the retiring Trustee (at the
Company's cost and expense), the Company or the Holder or Holders of at least
10% in aggregate principal amount of the outstanding Notes may petition any
court of competent jurisdiction for the appointment of a successor Trustee.

                  If the Trustee fails to comply with Section 7.10 hereof, any
Securityholder may petition any court of competent jurisdiction for the removal
of the Trustee and the appointment of a successor Trustee.

                  Notwithstanding replacement of the Trustee pursuant to this
Section 7.8, the Company's and the Guarantors' obligations under Section 7.7
hereof shall continue for the benefit of the retiring Trustee.

SECTION 7.9. SUCCESSOR TRUSTEE BY MERGER, ETC.

                  If the Trustee consolidates with, merges or converts into, or
transfers all or substantially all of its corporate trust business to, another
corporation, the resulting, surviving or transferee corporation without any
further act shall, if such resulting, surviving or transferee corporation is
otherwise eligible hereunder, be the successor Trustee.

SECTION 7.10. ELIGIBILITY; DISQUALIFICATION

                  The Trustee shall at all times satisfy the requirements of TIA
Section 310(a)(1), (2) and (5). The Trustee shall have a combined capital and
surplus of at least $25,000,000, as set forth in its most recent published
annual report of condition. The Trustee shall comply with TIA Section 310(b).

SECTION 7.11. PREFERENTIAL COLLECTION OF CLAIMS AGAINST COMPANY.

                  The Trustee shall comply with TIA Section 311(a), excluding
any creditor relationship listed in TIA Section 311(b). A Trustee who has
resigned or been removed shall be subject to TIA Section 311(a) to the extent
indicated.

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                                  ARTICLE VIII

                    LEGAL DEFEASANCE AND COVENANT DEFEASANCE
                         AND SATISFACTION AND DISCHARGE

SECTION 8.1. OPTION TO EFFECT LEGAL DEFEASANCE OR COVENANT DEFEASANCE

                  The Company may elect to have Section 8.2, at the Company's
option and at any time, or Section 8.3, at the Company's option and at any time,
of this Indenture applied to all outstanding Notes upon compliance with the
conditions set forth below in this Article VIII.

SECTION 8.2. LEGAL DEFEASANCE AND DISCHARGE

                  Upon the Company's exercise under Section 8.1 hereof of the
option applicable to this Section 8.2, the Company and the Guarantors shall be
deemed to have been discharged from their respective obligations with respect to
all outstanding Notes and Guarantees on the date the conditions set forth below
are satisfied (hereinafter, "Legal Defeasance"). For this purpose, such Legal
Defeasance means that the Company shall be deemed to have paid and discharged
the entire indebtedness represented by the Notes, and this Indenture shall cease
to be of further effect as to all outstanding Notes and Guarantees, except as to
be deemed to be "outstanding" only for the purposes of the Sections of this
Indenture referred to in (a) and (b) below, and the Company and the Guarantors
shall be deemed to have satisfied all other of their respective obligations
under such Notes and this Indenture (and the Trustee, on demand of and at the
expense of the Company, shall execute proper instruments acknowledging the
same), except for the following which shall survive until otherwise terminated
or discharged hereunder: (a) the rights of Holders of outstanding Notes to
receive payments in respect of the principal of, premium, if any, and interest
(and Liquidated Damages, if any) on such Notes when such payments are due from
the trust described in Section 8.5, (b) the Company's obligations with respect
to such Notes under Sections 2.3, 2.4, 2.6, 2.7, 2.10, 4.2, 8.5, 8.6 and 8.7
hereof, and (c) the rights, powers, trusts, duties and immunities of the Trustee
hereunder and the Company's obligations in connection therewith. Subject to
compliance with this Article VIII, the Company may exercise its option under
this Section 8.2 notwithstanding the prior exercise of its option under Section
8.3 hereof with respect to the Notes.

SECTION 8.3. COVENANT DEFEASANCE

                  Upon the Company's exercise under Section 8.1 hereof of the
option applicable to this Section 8.3, the Company and the Guarantors shall be
released from their respective obligations under the covenants contained in
Sections 4.3, 4.6, 4.8, 4.10, 4.11, 4.12, 4.13, 4.14, 4.16, 4.17, 4.18, 4.19 and
4.20, Article V, Article X and the third and fourth paragraphs of Section
11.1(a) hereof with respect to the outstanding Notes on and after the date the
conditions set forth below are satisfied (hereinafter, "Covenant Defeasance"),
and the Notes shall thereafter be deemed not "outstanding" for the purposes of
any direction, waiver, consent or declaration or act of Holders (and the
consequences of any thereof) in connection with such covenants, but

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shall continue to be deemed "outstanding" for all other purposes hereunder. For
this purpose, such Covenant Defeasance means that, with respect to the
outstanding Notes, neither the Company nor any Guarantor need comply with and
shall have any liability in respect of any term, condition or limitation set
forth in any such covenant, whether directly or indirectly, by reason of any
reference elsewhere herein to any such covenant or by reason of any reference in
any such covenant to any other provision herein or in any other document and
such omission to comply shall not constitute a Default or an Event of Default
under Section 6.1(3), but, except as specified above, the remainder of this
Indenture and such Notes shall be unaffected thereby. In addition, upon the
Company's exercise under Section 8.1 hereof of the option applicable to this
Section 8.3, and subject to Section 8.4, Sections 6.1(6) through 6.1(8) hereof
shall not constitute Events of Default with respect to the Notes.

SECTION 8.4. CONDITIONS TO LEGAL OR COVENANT DEFEASANCE

                  The following shall be the conditions to the application of
either Section 8.2 or 8.3 hereof to the outstanding Notes:

                  (a) (i) The Company shall irrevocably deposit with the
Trustee, in trust, for the benefit of the Holders of the Notes, U.S. legal
tender, U.S. Government Obligations or a combination thereof, in such amounts as
will be sufficient, in the opinion of a nationally recognized firm of
independent public accountants, to pay the principal of, premium, if any, and
interest (and Liquidated Damages, if any) on such Notes on the stated date for
payment thereof or on the redemption date of such principal or installment of
principal of, premium, if any, or interest (and Liquidated Damages, if any) on
such Notes, and the Trustee must have, for the benefit of the Holders of Notes,
a valid, perfected, exclusive security interest in such trust; (ii) in the case
of Legal Defeasance, the Company shall have delivered to the Trustee an opinion
of counsel in the United States reasonably acceptable to the Trustee confirming
that: (A) the Company has received from, or there has been published by the
Internal Revenue Service, a ruling or (B) since the date of this Indenture,
there has been a change in the applicable federal income tax law, in either case
to the effect that, and based thereon such opinion of counsel shall confirm
that, the Holders of such Notes will not recognize income, gain or loss for
federal income tax purposes as a result of such Legal Defeasance and will be
subject to federal income tax on the same amounts, in the same manner and at the
same times as would have been the case if such Legal Defeasance had not
occurred; (iii) in the case of Covenant Defeasance, the Company shall have
delivered to the Trustee an opinion of counsel in the United States reasonably
acceptable to such Trustee confirming that the Holders of such Notes will not
recognize income, gain or loss for federal income tax purposes as a result of
such Covenant Defeasance and will be subject to federal income tax on the same
amounts, in the same manner and at the same times as would have been the case if
such Covenant Defeasance had not occurred; (iv) no Default or Event of Default
(other than a Default resulting from the borrowing of funds to be applied to
such deposit and the grant of any Lien securing such borrowing) shall have
occurred and be continuing on the date of such deposit or insofar as Events of
Default from bankruptcy or insolvency events are concerned, at any time in the
period ending on the 91st day

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after the date of deposit; (v) such Legal Defeasance or Covenant Defeasance
shall not result in a breach or violation of, or constitute a default under this
Indenture (other than a Default resulting from the borrowing of funds to be
applied to such deposit and the grant of any Lien securing such borrowing) or
any other material agreement or instrument to which the Company or any of its
Subsidiaries is a party or by which the Company or any of its Subsidiaries is
bound; (vi) the Company shall have delivered to the Trustee an Officers'
Certificate stating that the deposit was not made by the Company with the intent
of preferring the Holders of such Notes over any other creditors of the Company
or with the intent of defeating, hindering, delaying or defrauding any other
creditors of the Company or others; and (vii) the Company shall have delivered
to the Trustee an Officers' Certificate and an opinion of counsel, each stating
that the conditions precedent provided for in, in the case of the Officers'
Certificate, (i) through (vi) and, in the case of the opinion of counsel,
clauses (i) (with respect to the validity and perfection of the security
interest), (ii), (iii) and (v) of this paragraph have been complied with and the
Company shall have delivered to the Trustee an Officers' Certificate, subject to
such qualifications and exceptions as the Trustee deems appropriate, to the
effect that, assuming no Holder of the Notes is an insider of the Company, the
trust funds will not be subject to the effect of any applicable Federal
bankruptcy, insolvency, reorganization or similar laws affecting creditors'
rights generally. Any Legal Defeasance or Covenant Defeasance shall be effective
on the earlier of (i) the 91st day after the date of such deposit, and (ii) the
day on which all of the conditions set forth in this Section 8.4 have been
satisfied.

         If the funds deposited with the Trustee to effect Covenant Defeasance
are insufficient to pay the principal of, premium, if any, and interest (and
Liquidated Damages, if any) on the Notes when due, or if any court enters an
order directing the repayment of the deposit to the Company or otherwise making
the deposit unavailable to make payments under the Notes when due, then (so long
as the insufficiency exists or the order remains in effect) the obligations of
the Company and the Guarantors under this Indenture will be revived and no such
defeasance will be deemed to have occurred.

SECTION 8.5. DEPOSITED CASH AND U.S. GOVERNMENT OBLIGATIONS TO BE HELD IN TRUST;
             OTHER MISCELLANEOUS PROVISIONS

                  Subject to Section 8.6 hereof, all cash and U.S. Government
Obligations (including the proceeds thereof) deposited with the Trustee (or
other qualifying trustee, collectively for purposes of this Section 8.5, the
"Paying Agent") pursuant to Section 8.4 hereof in respect of the outstanding
Notes shall be held in trust and applied by the Paying Agent, in accordance with
the provisions of such Notes and this Indenture, to the payment, either directly
or through any other Paying Agent as the Trustee may determine, to the Holders
of such Notes of all sums due and to become due thereon in respect of principal,
premium, if any, and interest (and Liquidated Damages, if any), but such money
need not be segregated from other funds except to the extent required by law.

                  The Company shall pay and indemnify the Trustee against any
tax, fee or other charge imposed on or assessed against the U.S. Government
Obligations deposited pursuant to

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Section 8.4 or the principal and interest received in respect thereof other than
any such tax, fee or other charge which by law is for the account of the Holders
of outstanding Notes.

SECTION 8.6. REPAYMENT TO THE COMPANY

                  (a) Anything in this Article VIII to the contrary
notwithstanding, the Trustee or the Paying Agent shall deliver or pay to the
Company from time to time upon the request of the Company any cash or U.S.
Government Obligations held by it as provided in Section 8.4 hereof which, in
the opinion of a nationally recognized firm of independent public accountants
expressed in a written certification thereof delivered to the Trustee (which may
be the opinion delivered under Section 8.4(a) hereof), are in excess of the
amount thereof that would then be required to be deposited to effect an
equivalent Legal Defeasance or Covenant Defeasance.

                  (b) Any cash and U.S. Government Obligations (including the
proceeds thereof) deposited with the Trustee or any Paying Agent, or then held
by the Company, in trust for the payment of the principal of, premium, if any,
or interest (and Liquidated Damages, if any) on any Note and remaining unclaimed
for two years after such principal, and premium, if any, or interest (and
Liquidated Damages, if any) has become due and payable shall be paid to the
Company on its request; and the Holder of such Note shall thereafter look only
to the Company for payment thereof, and all liability of the Trustee or such
Paying Agent with respect to such trust money shall thereupon cease; provided,
however, that the Trustee or such Paying Agent, before being required to make
any such repayment, may at the expense of the Company cause to be published
once, in the New York Times and The Wall Street Journal (national edition),
notice that such money remains unclaimed and that, after a date specified
therein, which shall not be less than 30 days from the date of such notification
or publication, any unclaimed balance of such money then remaining will be
repaid to the Company.

SECTION 8.7. REINSTATEMENT

                  If the Trustee or Paying Agent is unable to apply any cash or
U.S. Government Obligations in accordance with Section 8.2 or 8.3 hereof, as the
case may be, of this Indenture by reason of any order or judgment of any court
or governmental authority enjoining, restraining or otherwise prohibiting such
application, then the Company's and the Guarantors' obligations under this
Indenture and the Notes shall be revived and reinstated as though no deposit had
occurred pursuant to Section 8.2 or 8.3 hereof until such time as the Trustee or
Paying Agent is permitted to apply such money in accordance with Sections 8.2
and 8.3 hereof, as the case may be; provided, however, that, if the Company
makes any payment of principal of, premium, if any, or interest (and Liquidated
Damages, if any) on any Note following the reinstatement of its obligations, the
Company shall be subrogated to the rights of the Holders of such Notes to
receive such payment from the cash or U.S. Government Obligations held by the
Trustee or Paying Agent.

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SECTION 8.8. SATISFACTION AND DISCHARGE

         (a) All outstanding Notes have been delivered to the Trustee for
cancellation; or

         (b)(1) the Company has given irrevocable and unconditional notice of
redemption for all of the outstanding Notes under Article III hereof, or all
outstanding Notes have otherwise become due and payable, and we have irrevocably
deposited or caused to be deposited with the Trustee an amount of money
sufficient to pay and discharge the entire Indebtedness (including all
principal, premium, if any, and accrued interest, and Liquidated Damages, if
any) on all outstanding Notes,

         (2) the Company has delivered irrevocable instructions to the Trustee
to apply the deposited money toward the payment of the Notes at maturity or the
redemption date, as the case may be,

         (3) the Trustee, for the benefit of the Holders of the Notes, has a
valid, perfected, exclusive security interest in the trust,

         (4) the deposit does and will not result in a breach or violation of,
or constitute a default under this Indenture or any other material agreement or
instrument to which the Company or any of its Subsidiaries is a party or is
otherwise bound,

         (5) the Company has paid all other amounts payable by it under this
Indenture, and

         (6) the Company has delivered to the Trustee and Officers' Certificate
stating that the deposit was not made by it with the intent to hinder, delay, or
defraud any other of its creditors.

         The Company must also deliver to the Trustee an Officers' Certificate
and an Opinion of Counsel confirming the satisfaction of the conditions in
clauses (3) (with respect to the validity and perfection of the security
interest) and (4) above.

                                   ARTICLE IX

                       AMENDMENTS, SUPPLEMENTS AND WAIVERS

SECTION 9.1. SUPPLEMENTAL INDENTURES WITHOUT CONSENT OF HOLDERS

                  Without the consent of any Holder, the Company or any
Guarantor, when authorized by Board Resolutions, and the Trustee, at any time
and from time to time, may enter into one or more indentures supplemental
hereto, in form satisfactory to the Trustee, for any of the following purposes:

                  (1) to cure any ambiguity, defect, or inconsistency;

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                  (2) to add to the covenants of the Company or the Guarantors
         for the benefit of the Holders, or to surrender any right or power
         herein conferred upon the Company or the Guarantors;

                  (3) to provide for collateral for or additional Guarantors of
         the Notes;

                  (4) to evidence the succession of another Person to the
         Company, and the assumption by any such successor of the obligations of
         the Company, herein and in the Notes in accordance with Article V;

                  (5) to comply with the TIA;

                  (6) to evidence the succession of another corporation to any
         Guarantor and assumption by any such successor of the Guarantee of such
         Guarantor (as set forth in Section 11.4) in accordance with Article XI;

                  (7) to evidence the release of any Guarantor in accordance
         with Article XI;

                  (8) to evidence and provide for the acceptance of appointment
         hereunder by a successor Trustee with respect to the Notes;

                  (9) in any other case where a supplemental indenture is
         required or permitted to be entered into pursuant to the provisions of
         this Indenture without the consent of any Holder;

                  (10) to provide for the issuance and authorization of the
         Exchange Notes; or

                  (11) to make any change that does not adversely affect the
         rights of any Holder.

SECTION 9.2. AMENDMENTS, SUPPLEMENTAL INDENTURES AND WAIVERS WITH CONSENT OF
             HOLDERS

                  Subject to Section 6.8 hereof, with the consent of the Holders
of not less than a majority in aggregate principal amount of the Notes then
outstanding (including consents obtained in connection with a tender offer or
exchange offer for such Notes), by written act of said Holders delivered to the
Company and the Trustee, the Company and the Guarantors, when authorized by
Board Resolutions, and the Trustee may amend or supplement this Indenture or
enter into an indenture or indentures supplemental hereto for the purpose of
adding any provisions to or changing in any manner or eliminating any of the
provisions of this Indenture or of modifying in any manner the rights of the
Holders under this Indenture or the Notes. Subject to Section 6.8, the Holder or
Holders of not less than a majority in aggregate principal amount of Notes then
outstanding may waive compliance by the Company or any Guarantor with any
provision of this Indenture or the Notes.

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<PAGE>

                  Notwithstanding any of the above, however, no such amendment,
supplemental indenture or waiver shall, without the consent of Holders of at
least 66 2/3% in aggregate principal amount of the Notes then outstanding,
modify the provisions (including the defined terms used therein) governing the
terms of the Guarantees or, except as set forth in clause (1) below, the
provisions (including the defined terms used therein) of Article X, in either
case in a manner adverse to the Holders.

                  Notwithstanding any of the above, however, no such amendment,
supplemental indenture or waiver shall, without the consent of the Holder of
each outstanding Note affected thereby:

                  (1) change the Stated Maturity on any Note, or reduce the
         principal amount thereof or the rate (or extend the time for payment)
         of interest thereon or any premium payable upon the redemption thereof
         at the Company's option, or change the city of payment where, or the
         coin or currency in which, any Note or any premium or the interest
         thereon is payable, or impair the right to institute suit for the
         enforcement of any such payment on or after the Stated Maturity thereof
         (or, in the case of redemption at the Company's option, on or after the
         Redemption Date), or after an Asset Sale or Change of Control has
         occurred, reduce the Change of Control Purchase Price or the Asset Sale
         Offer Price with respect to the corresponding Asset Sale or Change of
         Control or alter the provisions (including the defined terms used
         therein) regarding the Company's right to redeem the Notes as a right,
         or at the Company's option, in a manner adverse to the Holders; or

                  (2) reduce the percentage in principal amount of the
         outstanding Notes, the consent of whose Holders is required for any
         such amendment, supplemental indenture or waiver provided for in this
         Indenture; or

                  (3) modify any of the waiver provisions, except to increase
         any required percentage or to provide that certain other provisions of
         this Indenture cannot be modified or waived without the consent of the
         Holder of each outstanding Note affected thereby; or

                  (4) cause the Notes or any Guarantee to become subordinate in
         right of payment to any other Indebtedness.

                  It shall not be necessary for the consent of the Holders under
this Section 9.2 to approve the particular form of any proposed amendment,
supplement or waiver, but it shall be sufficient if such consent approves the
substance thereof.

                  After an amendment, supplement or waiver under this Section
becomes effective, the Company shall mail to the Holders affected thereby a
notice briefly describing the amendment, supplement or waiver. Any failure of
the Company to mail such notice, or any

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defect therein, shall not, however, in any way impair or affect the validity of
any such supplemental indenture or waiver.

                  After an amendment, supplement or waiver under this Section
9.2 or under Section 9.4 hereof becomes effective, it shall bind each Holder.

                  In connection with any amendment, supplement or waiver under
this Article IX, the Company may, but shall not be obligated to, offer to any
Holder who consents to such amendment, supplement or waiver, or to all Holders,
consideration for such Holder's consent to such amendment, supplement or waiver.

SECTION 9.3. COMPLIANCE WITH TIA

                  Every amendment, waiver or supplement of this Indenture or the
Notes shall comply with the TIA as then in effect.

SECTION 9.4. REVOCATION AND EFFECT OF CONSENTS

                  Until an amendment, waiver or supplement becomes effective, a
consent to it by a Holder is a continuing consent by the Holder and every
subsequent Holder of a Note or portion of a Note that evidences the same debt as
the consenting Holder's Note, even if notation of the consent is not made on any
Note. However, any such Holder or subsequent Holder may revoke the consent as to
his Note or portion of his Note by written notice to the Company or the Person
designated by the Company as the Person to whom consents should be sent if such
revocation is received by the Company or such Person before the date on which
the Trustee receives an Officers' Certificate certifying that the Holders of the
requisite principal amount of Notes have consented (and not theretofore revoked
such consent) to the amendment, supplement or waiver.

                  The Company may, but shall not be obligated to, fix a record
date for the purpose of determining the Holders entitled to consent to any
amendment, supplement or waiver, which record date shall be the date so fixed by
the Company notwithstanding the provisions of the TIA. If a record date is
fixed, then notwithstanding the last sentence of the immediately preceding
paragraph, those Persons who were Holders at such record date, and only those
Persons (or their duly designated proxies), shall be entitled to revoke any
consent previously given, whether or not such Persons continue to be Holders
after such record date.

                  After an amendment, supplement or waiver becomes effective, it
shall bind every Securityholder, unless it makes a change described in any of
clauses (1) through (3) of Section 9.2 hereof, in which case, the amendment,
supplement or waiver shall bind only each Holder of a Note who has consented to
it and every subsequent Holder of a Note or portion of a Note that evidences the
same debt as the consenting Holder's Note; provided, that any such waiver shall
not impair or affect the right of any Holder to receive payment of principal and
premium of and interest (and Liquidated Damages, if any) on a Note, on or after
the respective dates set

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for such amounts to become due and payable expressed in such Note, or to bring
suit for the enforcement of any such payment on or after such respective dates.

SECTION 9.5. NOTATION ON OR EXCHANGE OF NOTES

                  If an amendment, supplement or waiver changes the terms of a
Note, the Trustee may require the Holder of the Note to deliver it to the
Trustee or require the Holder to put an appropriate notation on the Note. The
Trustee may place an appropriate notation on the Note about the changed terms
and return it to the Holder. Alternatively, if the Company or the Trustee so
determines, the Company in exchange for the Note shall issue and the Trustee
shall authenticate a new Note that reflects the changed terms. Any failure to
make the appropriate notation or to issue a new Note shall not affect the
validity of such amendment, supplement or waiver.

SECTION 9.6. TRUSTEE TO SIGN AMENDMENTS, ETC.

                  The Trustee shall execute any amendment, supplement or waiver
authorized pursuant to this Article IX; provided, that the Trustee may, but
shall not be obligated to, execute any such amendment, supplement or waiver
which affects the Trustee's own rights, duties or immunities under this
Indenture. The Trustee shall be entitled to receive, and shall be fully
protected in relying upon, an Opinion of Counsel stating that the execution of
any amendment, supplement or waiver authorized pursuant to this Article IX is
authorized or permitted by this Indenture.

                                    ARTICLE X

                           RIGHT TO REQUIRE REPURCHASE

SECTION 10.1. REPURCHASE OF NOTES AT THE OPTION OF THE HOLDER UPON A CHANGE OF
              CONTROL.

                  (a) In the event that a Change of Control has occurred, each
Holder of Notes will have the right, at such Holder's option, pursuant to an
offer (subject only to conditions required by applicable law, if any) by the
Company (the "Change of Control Offer"), to require the Company to repurchase
all or any part of such Holder's Notes (provided, that the principal amount of
such Notes must be $1,000 or an integral multiple thereof) on a date (the
"Change of Control Purchase Date") that is no later than 60 days after the
occurrence of such Change of Control, at a cash price equal to 101% of the
principal amount thereof (the "Change of Control Purchase Price"), together with
accrued and unpaid interest and Liquidated Damages, if any, to the Change of
Control Purchase Date.

         Notwithstanding the foregoing, the Company will not be required to make
a Change of Control Offer upon a Change of Control if a third party makes the
Change of Control Offer in

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<PAGE>

the manner, at the times and otherwise in compliance with the requirements set
forth herein applicable to a Change of Control Offer made by the Company and
purchases all Notes validly tendered and not withdrawn under such Change of
Control Offer. In addition, if the Convertible Note is outstanding on the date
of a Change of Control that also constitutes a "Change of Control" as defined in
the Convertible Note, the Change of Control notice delivered to Holders pursuant
to this Indenture shall include a statement that the Company will prepay or
redeem the Convertible Note upon the completion of the Change of Control Offer
in accordance with clause (z) of Section 4.3.

                  (b) In the event that, pursuant to this Section 10.1, the
Company shall be required to commence a Change of Control Offer, the Company
shall follow the procedures set forth in this Section 10.1 as follows:

                  (1) the Change of Control Offer shall commence within 30 days
         following the occurrence of a Change of Control;

                  (2) the Change of Control Offer shall remain open for 20
         Business Days following its commencement (the "Change of Control Offer
         Period") or such other period as may be required by applicable law;

                  (3) upon the expiration of the Change of Control Offer Period,
         the Company promptly shall purchase all of the properly tendered Notes
         at the Change of Control Purchase Price;

                  (4) if the Change of Control Purchase Date is on or after an
         interest payment Record Date and on or before the associated Interest
         Payment Date, any accrued and unpaid interest (and Liquidated Damages,
         if any) due on such Interest Payment Date will be paid to the Person in
         whose name a Note is registered at the close of business on such Record
         Date on the corresponding Interest Payment Date;

                  (5) the Company shall provide the Trustee and the Paying Agent
         with written notice of the Change of Control Offer at least three
         Business Days before the commencement of any Change of Control Offer;
         and

                  (6) on or before the commencement of any Change of Control
         Offer, the Company or the Trustee (upon the request and at the expense
         of the Company) shall send, by first-class mail, a notice to each of
         the Securityholders, which (to the extent consistent with this
         Indenture) shall govern the terms of the Change of Control Offer and
         shall state:

                                    (A) that the Change of Control Offer is
                  being made pursuant to this Section 10.1 and that all Notes,
                  or portions thereof, tendered will be accepted for payment;

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<PAGE>

                                    (B) the Change of Control Purchase Price
                  (including the amount of accrued but unpaid interest (and
                  Liquidated Damages, if any)) and the Change of Control
                  Purchase Date;

                                    (C) that any Note, or portion thereof, not
                  tendered or accepted for payment will continue to accrue
                  interest (and Liquidated Damages, if any);

                                    (D) that, unless the Company defaults in
                  depositing cash with the Paying Agent in accordance with the
                  penultimate paragraph of this Section 10.1, or such payment is
                  prevented for any reason, any Note, or portion thereof,
                  accepted for payment pursuant to the Change of Control Offer
                  shall cease to accrue interest (and Liquidated Damages, if
                  any) after the Change of Control Purchase Date;

                                    (E) that Holders electing to have a Note, or
                  portion thereof, purchased pursuant to a Change of Control
                  Offer will be required to surrender the Note, with the form
                  entitled "Option of Holder to Elect Purchase" on the reverse
                  of the Note completed, to the Paying Agent (which may not for
                  purposes of this Section 10.1, notwithstanding anything in
                  this Indenture to the contrary, be the Company or any
                  Affiliate of the Company) at the address specified in the
                  notice prior to the expiration of the Change of Control Offer;

                                    (F) that Holders will be entitled to
                  withdraw their election, in whole or in part, if the Paying
                  Agent receives, prior to the expiration of the Change of
                  Control Offer, a facsimile transmission or letter setting
                  forth the name of the Holder, the principal amount of the
                  Notes the Holder is withdrawing and a statement containing a
                  facsimile signature and stating that such Holder is
                  withdrawing his election to have such principal amount of
                  Notes purchased;

                                    (G) that Holders whose Notes are purchased
                  only in part will be issued new Notes equal in principal
                  amount to the unpurchased portion of the Notes surrendered;
                  and

                                    (H) a brief description of the events
                  resulting in such Change of Control.

                  On or before the Change of Control Purchase Date, the Company
shall:

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<PAGE>

                  (1) accept for payment Notes or portions thereof properly
         tendered pursuant to the Change of Control Offer;

                  (2) deposit with the Paying Agent an amount in cash sufficient
         to pay the Change of Control Purchase Price (together with accrued and
         unpaid interest and Liquidated Damages, if any) of all Notes so
         tendered; and

                  (3) deliver to the Trustee the Notes so accepted together with
         an Officers' Certificate listing the Notes or portions thereof being
         purchased by the Company.

                  The Paying Agent promptly shall pay the Holders of Notes so
accepted an amount equal to the Change of Control Purchase Price (together with
accrued and unpaid interest and Liquidated Damages, if any), and the Trustee
promptly will authenticate and deliver to such Holders a new Note equal in
principal amount to any unpurchased portion of the Note surrendered. Any Notes
not so accepted will be delivered promptly by the Company to the Holder thereof.
The Company publicly will announce the results of the Change of Control Offer on
or as soon as practicable after the Change of Control Purchase Date.

                  Any Change of Control Offer shall be made in compliance with
all applicable laws, rules and regulations, including, if applicable, Regulation
14E under the Exchange Act and the rules thereunder and all other applicable
Federal and state securities laws. To the extent that the provisions of any
securities laws or regulations conflict with the provisions of this Article X,
the Company's compliance or compliance by any of the Guarantors with such laws
and regulations shall not in and of itself cause a breach of their obligations
under this Article X.

                                   ARTICLE XI

                                    GUARANTEE

SECTION 11.1. GUARANTEE

                  (a) Each of the Guarantors shall, jointly and severally,
irrevocably and unconditionally guarantee, on a senior basis (the "Guarantee"),
to each Holder of a Note authenticated and delivered by the Trustee and to the
Trustee and its successors and assigns, irrespective of the validity and
enforceability against the Company and any other Guarantors of this Indenture,
the Notes or the obligations of the Company under this Indenture or the Notes,
that: (x) the principal of and premium (if any), and interest (and Liquidated
Damages, if any) on the Notes will be paid in full when due, whether at the
Maturity Date or Interest Payment Date, by acceleration, call for redemption,
upon a Change of Control Offer, upon an Asset Sale Offer or otherwise; (y) all
other obligations of the Company to the Holders or the Trustee under this
Indenture or the Notes will be promptly paid in full or performed, all in
accordance with the terms of this Indenture and the Notes; and (z) in case of
any extension of time of payment or

                                       97
<PAGE>

renewal of any Notes or any of such other obligations, the same will be promptly
paid in full when due or performed in accordance with the terms of the extension
or renewal, whether at maturity, by acceleration, call for redemption, upon a
Change of Control Offer, upon an Asset Sale Offer or otherwise. Failing payment
when due of any amount so guaranteed for whatever reason, each Guarantor shall
be obligated to pay the same before failure so to pay becomes an Event of
Default. Each Guarantor agrees that this is a guarantee of payment and not a
guarantee of collection.

                  If the Company or a Guarantor defaults in the payment of the
principal of, premium, if any, or interest (or Liquidated Damages, if any) on,
the Notes when and as the same shall become due, whether upon maturity,
acceleration, call for redemption, upon a Change of Control Offer, upon an Asset
Sale Offer or otherwise, without the necessity of action by the Trustee or any
Holder, each Guarantor shall be required, jointly and severally, to promptly
make such payment in full.

                  The Company shall cause each Subsidiary that is formed or
acquired after the date hereof and each subsidiary that becomes a Subsidiary
after the date hereof, in each case other than Foreign Subsidiaries,
concurrently upon becoming a Subsidiary, to become a Guarantor hereunder and
execute and deliver to the Trustee a supplemental indenture as provided pursuant
to the terms of this Indenture.

                  Notwithstanding anything herein to the contrary, if any of the
Company's Subsidiaries (including Foreign Subsidiaries) that is not a Guarantor
guarantees any of the Company's other Indebtedness or any other Indebtedness of
any of its Subsidiaries, or the Company or any of its Subsidiaries, individually
or collectively, pledges more than 65% of the Voting Equity Interests of such
Subsidiary to a United States lender to secure Indebtedness of the Company or
Indebtedness of any Guarantor, then such Subsidiary must become a Guarantor in
accordance with the terms hereof.

                  (b) Each Guarantor hereby agrees to the fullest extent
permitted by applicable law, that its obligations with regard to this Guarantee
shall be unconditional, irrespective of the validity, regularity or
enforceability of the Notes or this Indenture, the absence of any action to
enforce the same, any delays in obtaining or realizing upon or failures to
obtain or realize upon collateral, the recovery of any judgment against the
Company, any action to enforce the same or any other circumstances that might
otherwise constitute a legal or equitable discharge or defense of a Guarantor.
Each Guarantor hereby waives, to the fullest extent permitted by applicable law,
diligence, presentment, demand of payment, filing of claims with a court in the
event of insolvency or bankruptcy of the Company, any right to require a
proceeding first against the Company or right to require the prior disposition
of the assets of the Company to meet its obligations, protest, notice and all
demands whatsoever and covenants that this Guarantee will not be discharged
except by complete performance of the obligations contained in the Notes and
this Indenture.

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<PAGE>

                  (c) If any Holder or the Trustee is required by any court or
otherwise to return to either the Company or any Guarantor, or any Custodian or
similar official acting in relation to either the Company or such Guarantor, any
amount paid by either the Company or such Guarantor to the Trustee or such
Holder, this Guarantee, to the extent theretofore discharged, shall be
reinstated in full force and effect. Each Guarantor agrees that it will not be
entitled to any right of subrogation in relation to the Holders in respect of
any obligations guaranteed hereby until payment in full of all obligations
guaranteed hereby. Each Guarantor further agrees that, as between such
Guarantor, on the one hand, and the Holders and the Trustee, on the other hand,
(i) the maturity of the obligations guaranteed hereby may be accelerated as
provided in Section 6.2 hereof for the purposes of this Guarantee,
notwithstanding any stay, injunction or other prohibition preventing such
acceleration as to the Company of the obligations guaranteed hereby, and (ii) in
the event of any declaration of acceleration of those obligations as provided in
Section 6.2 hereof, those obligations (whether or not due and payable) will
forthwith become due and payable by each of the Guarantors for the purpose of
this Guarantee.

                  (d) It is the intention of each Guarantor and the Company that
the obligations of each Guarantor hereunder shall be in, but not in excess of,
the maximum amount permitted by applicable law. Accordingly, if the obligations
in respect of the Guarantee would be annulled, avoided or subordinated to the
creditors of any Guarantor by a court of competent jurisdiction in a proceeding
actually pending before such court as a result of a determination both that such
Guarantee was made by such Guarantor without fair consideration and, immediately
after giving effect thereto, such Guarantor was insolvent or unable to pay its
debts as they mature or left with an unreasonably small capital, then the
obligations of such Guarantor under such Guarantee shall be reduced by such
court if and to the extent such reduction would result in the avoidance of such
annulment, avoidance or subordination; provided, however, that any reduction
pursuant to this paragraph shall be made in the smallest amount as is strictly
necessary to reach such result. For purposes of this paragraph, "fair
consideration", "insolvency", "unable to pay its debts as they mature",
"unreasonably small capital" and the effective times of reductions, if any,
required by this paragraph shall be determined in accordance with applicable
law.

SECTION 11.2. EXECUTION AND DELIVERY OF GUARANTEE

                  Each Guarantor shall, by virtue of such Guarantor's execution
and delivery of an indenture supplement pursuant to Section 11.1 hereof, be
deemed to have signed on each Note issued hereunder the notation of guarantee
set forth on the form of the Notes attached hereto as Exhibit A to the same
extent as if the signature of such Guarantor appeared on such Note.

                  The delivery of any Note by the Trustee, after the
authentication thereof hereunder, shall constitute due delivery of the guarantee
set forth in Section 11.1 on behalf of each Guarantor. The notation of a
guarantee set forth on any Note shall be null and void and of no further effect
with respect to the guarantee of any Guarantor which, pursuant to Section 11.4,
is released from such Guarantee.

                                       99
<PAGE>

SECTION 11.3. CERTAIN BANKRUPTCY EVENTS

                  Each Guarantor hereby covenants and agrees, to the fullest
extent that it may do so under applicable law, that in the event of the
insolvency, bankruptcy, dissolution, liquidation or reorganization of the
Company, such Guarantor shall not file (or join in any filing of), or otherwise
seek to participate in the filing of, any motion or request seeking to stay or
to prohibit (even temporarily) execution on the Guarantee and hereby waives and
agrees not to take the benefit of any such stay of execution, whether under
Section 362 or 105 of the United States Bankruptcy Code or otherwise.

SECTION 11.4. LIMITATION ON MERGER OF SUBSIDIARIES AND RELEASE OF GUARANTORS

                  No Guarantor shall consolidate or merge with or into (whether
or not such Guarantor is the surviving Person) another Person unless, subject to
the provisions of the following paragraph and the other provisions of this
Indenture, (1) the Person formed by or surviving any such consolidation or
merger (if other than such Guarantor) assumes all the obligations of such
Guarantor pursuant to a supplemental indenture in form reasonably satisfactory
to the Trustee, pursuant to which such Person shall unconditionally guarantee,
on a senior basis, all of such Guarantor's obligations under such Guarantor's
Guarantee on the terms set forth herein; (2) immediately before and immediately
after giving effect to such transaction on a pro forma basis, no Default or
Event of Default shall have occurred or be continuing; and (3) immediately after
giving effect to such transaction on a pro forma basis, the Company could incur
at least $1.00 of additional Indebtedness pursuant to the Debt Incurrence Ratio
set forth in Section 4.11. The provisions of this Section 11.4 shall not apply
to the merger of any Guarantors with and into each other or with or into the
Company.

         Upon the sale or disposition (whether by merger, stock purchase, Asset
Sale or otherwise) of a Guarantor (as an entirety) to an entity which is not,
and is not required to become, a Guarantor, or the designation of a Subsidiary
to become an Unrestricted Subsidiary, which transaction is otherwise in
compliance with this Indenture (including, without limitation, the provisions of
Section 4.14), such Guarantor will be deemed released from its obligations under
its Guarantee of the Notes; provided, however, that any such release shall occur
only to the extent that all obligations of such Guarantor under all of its
guarantees of, and under all of its pledges of assets or other security
interests that secure, any of the Company's Indebtedness or any Indebtedness of
any other of the Company's Subsidiaries shall also terminate upon such release,
sale or transfer and none of its Equity Interests are pledged for the benefit of
any holder of any of the Company's Indebtedness or any Indebtedness of any of
the Company's Subsidiaries.

                                      100
<PAGE>

                                   ARTICLE XII

                                  MISCELLANEOUS

SECTION 12.1. TIA CONTROLS

                  If any provision of this Indenture limits, qualifies, or
conflicts with the duties imposed by operation of the TIA, the imposed duties,
upon qualification of this Indenture under the TIA, shall control.

SECTION 12.2. NOTICES

                  Any notices or other communications required or permitted
hereunder shall be in writing, and shall be sufficiently given if made by hand
delivery, by telex, by telecopier, recognized overnight courier or registered or
certified mail, postage prepaid, return receipt requested, and addressed as
follows:

                  if to the Company or any Guarantor:

                           Radiologix, Inc.
                           3600 Chase Tower
                           2200 Ross Avenue
                           Dallas, Texas 75201
                           Attention: Chief Financial Officer

                  with a copy to:

                           Haynes & Boone, LLP
                           901 Main Street, Suite 3100
                           Dallas, Texas 75202
                           Attention: William R. Hays III, Esq.

                  if to the Trustee:

                           U.S. Bank, N.A.
                           180 East Fifth Street
                           St. Paul, Minnesota 55101
                           Attention: Corporate Trust Department

                  Any party by notice to each other party may designate
additional or different addresses as shall be furnished in writing by such
party. Any notice or communication to any party shall be deemed to have been
given or made as of the date so delivered, if personally delivered; when
answered back, if telexed; when receipt is acknowledged, if telecopied; the next
Business Day after timely delivery to a recognized overnight courier, if sent by
such courier guaranteeing next day delivery; and five Business Days after
mailing if sent by registered or certified mail, postage prepaid (except that a
notice of change of address shall not be deemed to have been given until
actually received by the addressee).

                                       101
<PAGE>

                  Any notice or communication mailed to a Securityholder shall
be mailed to him by first class mail or other equivalent means at his address as
it appears on the registration books of the Registrar and shall be sufficiently
given to him if so mailed within the time prescribed.

                  Failure to mail a notice or communication to a Securityholder
or any defect in it shall not affect its sufficiency with respect to other
Securityholders. If a notice or communication is mailed in the manner provided
above, it is duly given, whether or not the addressee receives it.

SECTION 12.3. COMMUNICATIONS BY HOLDERS WITH OTHER HOLDERS

                  Securityholders may communicate pursuant to TIA Section 312(b)
with other Securityholders with respect to their rights under this Indenture or
the Notes. The Company, the Trustee, the Registrar and any other Person shall
have the protection of TIA Section 312(c).

SECTION 12.4. CERTIFICATE AND OPINION AS TO CONDITIONS PRECEDENT

                  Upon any request or application by the Company or any
Guarantor to the Trustee to take any action under this Indenture, such Person
shall furnish to the Trustee:

                  (1) an Officers' Certificate (in form and substance reasonably
         satisfactory to the Trustee) stating that, in the opinion of the
         signers, all conditions precedent, if any, provided for in this
         Indenture relating to the proposed action have been met; and

                  (2) an Opinion of Counsel (in form and substance reasonably
         satisfactory to the Trustee) stating that, in the opinion of such
         counsel, all such conditions precedent have been met.

SECTION 12.5. STATEMENTS REQUIRED IN CERTIFICATE OR OPINION

                  Each certificate or opinion with respect to compliance with a
condition or covenant provided for in this Indenture shall include:

                  (1) a statement that the Person making such certificate or
         opinion has read such covenant or condition;

                  (2) a brief statement as to the nature and scope of the
         examination or investigation upon which the statements or opinions
         contained in such certificate or opinion are based;

                  (3) a statement that, in the opinion of such Person, he has
         made such examination or investigation as is necessary to enable him to
         express an informed opinion as to whether or not such covenant or
         condition has been met; and

                                      102
<PAGE>

                  (4) a statement as to whether or not, in the opinion of each
         such Person, such condition or covenant has been met; provided,
         however, that, with respect to matters of fact, an Opinion of Counsel
         may rely on an Officers' Certificate or certificates of public
         officials.

SECTION 12.6. RULES BY TRUSTEE, PAYING AGENT, REGISTRAR

                  The Trustee may make reasonable rules for action by or at a
meeting of Securityholders. The Paying Agent or Registrar may make reasonable
rules for its functions.

SECTION 12.7. LEGAL HOLIDAYS

                  A "Legal Holiday" is a Saturday, a Sunday or a day on which
banking institutions in New York, New York are authorized or obligated by law or
executive order to close. If a payment date is a Legal Holiday at such place,
payment may be made at such place on the next succeeding day that is not a Legal
Holiday, and no interest (or Liquidated Damages, if any) shall accrue for the
intervening period.

SECTION 12.8. GOVERNING LAW

                  THIS INDENTURE, THE GUARANTEES AND THE NOTES SHALL BE GOVERNED
BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK, AS
APPLIED TO CONTRACTS MADE AND PERFORMED WITHIN THE STATE OF NEW YORK, INCLUDING,
WITHOUT LIMITATION, SECTIONS 5-1401 AND 5-1402 OF THE NEW YORK GENERAL
OBLIGATIONS LAW AND RULE 327(b) OF THE NEW YORK CIVIL PRACTICE LAWS AND RULES.
EACH OF THE COMPANY AND THE GUARANTORS HEREBY IRREVOCABLY SUBMITS TO THE
JURISDICTION OF ANY NEW YORK STATE COURT SITTING IN THE BOROUGH OF MANHATTAN IN
THE CITY OF NEW YORK OR ANY FEDERAL COURT SITTING IN THE BOROUGH OF MANHATTAN IN
THE CITY OF NEW YORK IN RESPECT OF ANY SUIT, ACTION OR PROCEEDING ARISING OUT OF
OR RELATING TO THIS INDENTURE AND THE NOTES, AND IRREVOCABLY ACCEPTS FOR ITSELF
AND IN RESPECT OF ITS PROPERTY, GENERALLY AND UNCONDITIONALLY, JURISDICTION OF
THE AFORESAID COURTS. EACH OF THE COMPANY AND THE GUARANTORS IRREVOCABLY WAIVES,
TO THE FULLEST EXTENT IT MAY EFFECTIVELY DO SO UNDER APPLICABLE LAW, ANY
OBJECTION WHICH IT MAY NOW OR HEREAFTER HAVE TO THE LAYING OF THE VENUE OF ANY
SUCH SUIT, ACTION OR PROCEEDING BROUGHT IN ANY SUCH COURT AND ANY CLAIM THAT ANY
SUCH SUIT, ACTION OR PROCEEDING BROUGHT IN ANY SUCH COURT HAS BEEN BROUGHT IN AN
INCONVENIENT FORUM. NOTHING HEREIN SHALL AFFECT THE RIGHT OF THE TRUSTEE OR ANY
SECURITYHOLDER TO SERVE PROCESS IN ANY OTHER MANNER PERMITTED BY LAW OR TO
COMMENCE LEGAL PROCEEDINGS OR OTHERWISE PROCEED AGAINST THE COMPANY AND THE
GUARANTORS IN ANY OTHER JURISDICTION.

                                      103
<PAGE>

SECTION 12.9. NO ADVERSE INTERPRETATION OF OTHER AGREEMENTS

                  This Indenture may not be used to interpret another indenture,
loan or debt agreement of the Company or any Guarantor or any of their
respective Subsidiaries. Any such indenture, loan or debt agreement may not be
used to interpret this Indenture.

SECTION 12.10. NO RECOURSE AGAINST OTHERS

                  No direct or indirect incorporator, stockholder, employee,
officer or director, as such, past, present or future, of the Company or any
Guarantor, or any successor entity, shall have any personal liability in respect
of the obligations of the Company or the Guarantors under this Indenture or the
Notes solely by reason of his or its status as such incorporator, stockholder,
employee, officer or director; provided, that this Section 12.10 shall in no way
limit the obligation of any Guarantor pursuant to any Guarantee of the Notes.
Each Securityholder by accepting a Note waives and releases all such liability.
The waiver and release are part of the consideration for the issuance of the
Notes.

SECTION 12.11. SUCCESSORS

                  All agreements of the Company and the Guarantors in this
Indenture and the Notes shall bind its successor. All agreements of the Trustee
in this Indenture shall bind its successor.

SECTION 12.12. DUPLICATE ORIGINALS

                  All parties may sign any number of copies or counterparts of
this Indenture. Each signed copy or counterpart shall be an original, but all of
them together shall represent the same agreement.

SECTION 12.13. SEVERABILITY

                  In case any one or more of the provisions in this Indenture or
in the Notes or in the Guarantees shall be held invalid, illegal or
unenforceable, in any respect for any reason, the validity, legality and
enforceability of any such provision in every other respect and of the remaining
provisions shall not in any way be affected or impaired thereby, it being
intended that all of the provisions hereof shall be enforceable to the full
extent permitted by law.

SECTION 12.14. TABLE OF CONTENTS, HEADINGS, ETC.

                  The Table of Contents, Cross-Reference Table and headings of
the Articles and the Sections of this Indenture have been inserted for
convenience of reference only, are not to be considered a part hereof and shall
in no way modify or restrict any of the terms or provisions hereof.

                                      104
<PAGE>

SECTION 12.15. QUALIFICATION OF INDENTURE

                  The Company shall qualify this Indenture under the TIA in
accordance with the terms and conditions of the Registration Rights Agreement
and shall pay all costs and expenses (including attorneys' fees for the Company
and the Trustee) incurred in connection therewith, including, but not limited
to, costs and expenses of qualification of this Indenture and the Notes and
printing this Indenture and the Notes. The Trustee shall be entitled to receive
from the Company any such Officers' Certificates, Opinions of Counsel or other
documentation as it may reasonably request in connection with any such
qualification of this Indenture under the TIA.

SECTION 12.16. REGISTRATION RIGHTS

                  Certain Holders of the Notes may be entitled to certain
registration rights with respect to such Notes pursuant to, and subject to the
terms of, the Registration Rights Agreement.

                                      105
<PAGE>

                                   SIGNATURES

                  IN WITNESS WHEREOF, the parties hereto have caused this
Indenture to be duly executed as of the date first written above.

                                  RADIOLOGIX, INC.,
                                  a Delaware corporation

                                  By:
                                      ------------------------------------------
                                      Name:  Mark L. Wagar
                                      Title: Chairman of the Board and Chief
                                             Executive Officer

                                  GUARANTORS:

                                  IDE IMAGING PARTNERS, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  PACIFIC IMAGING PARTNERS, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  QUESTAR IMAGING, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  WB&A IMAGING PARTNERS, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

<PAGE>

                                  TREASURE COAST IMAGING PARTNERS,
                                  INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  RADIOLOGIX SERVICES, INC.

                                  By:
                                       Name:
                                       Title:

                                  ADVANCED IMAGING PARTNERS, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  MID ROCKLAND IMAGING PARTNERS,
                                  INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  RADIOLOGY AND NUCLEAR MEDICINE
                                  IMAGING PARTNERS, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

<PAGE>

                                  COMMUNITY IMAGING PARTNERS, INC

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  VALLEY IMAGING PARTNERS, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  SAN JOSE IMAGING PARTNERS, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  ADVANCED RADIOLOGY, LLC

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  ADVANCED MEDICAL IMAGING, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  M&S IMAGING PARTNERS I, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

<PAGE>

                                  M&S IMAGING PARTNERS, L.P.

                                  By: M&S Imaging Partners I, Inc., its general
                                      partner

                                      By:
                                          --------------------------------------
                                          Name:
                                          Title:

                                  QUESTAR CLEVELAND, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  QUESTAR TAMPA, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  QUESTAR ORLANDO, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  ROCKY MOUNTAIN OPENSCAN MRI, LLC

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

<PAGE>

                                  PREMIER ADVANCED IMAGING
                                  NETWORK, LTD.

                                  By: Questar Orlando, Inc., its general partner

                                      By:
                                          --------------------------------------
                                          Name:
                                          Title:

                                  QUESTAR IMAGING MB, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  QUESTAR KANSAS, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  QUESTAR PVH, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  QUESTAR SAN FRANCISCO, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  QUESTAR HENDERSON, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

<PAGE>

                                  QUESTAR TRISTATES, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  QUESTAR PHILADELPHIA, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  QUESTAR WESTWOOD, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  QUESTAR DULUTH, INC

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  QUESTAR LINCOLN, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  QUESTAR H F M C, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

<PAGE>

                                  QUESTAR PALM SPRINGS, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  QUESTAR ATLANTA, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  QUESTAR MT. LAUREL, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  QUESTAR LOWER BUCKS, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  QUESTAR TOLEDO, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  QUESTAR SOUTH CHICAGO, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

<PAGE>

                                  QUESTAR NORTH GEORGIA, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  QUESTAR LOS ALAMITOS, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  QUESTAR DES PLAINES, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  QUESTAR VICTORVILLE, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  QUESTAR COLUMBUS, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  QUESTAR NAPERVILLE, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

<PAGE>

                                  QUESTAR QUAKERTOWN, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  QUESTAR TUCSON, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  M&S IMAGING INVESTMENTS, INC.

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

                                  U.S. BANK, N.A., as Trustee

                                  By:
                                      ------------------------------------------
                                      Name:
                                      Title:

<PAGE>
                                                                       EXHIBIT A

                                 [FORM OF NOTE]

                                RADIOLOGIX, INC.

                   10.5% [SERIES A] [SERIES B](1) SENIOR NOTE
                                    DUE 2008

                                                         CUSIP No.:  __________
No.                                                            $________________

         Radiologix, Inc., a Delaware corporation (hereinafter called the
"Company", which term includes any successors under the Indenture hereinafter
referred to), for value received, hereby promises to pay to __________, or
registered assigns, the principal sum of __________ Dollars, on December 15,
2008.

         Interest Payment Dates: June 15 and December 15 commencing June 15,
2002.

         Record Dates:  June 1 and December 1.

         Reference is made to the further provisions of this Note on the reverse
side, which will, for all purposes, have the same effect as if set forth at this
place.

--------

(1) Series A should be replaced with Series B in the Exchange Notes.

                                       A-1

<PAGE>

         IN WITNESS WHEREOF, the Company has caused this instrument to be duly
executed.

                                  RADIOLOGIX, INC.,
                                  a Delaware corporation

                                  By:
                                      ---------------------------------------
                                      Name:  Mark L. Wagar
                                      Title: Chairman of the Board and Chief
                                             Executive Officer

                                  By:
                                      ---------------------------------------
                                      Name:  Sami Abbasi
                                      Title: Chief Financial Officer and
                                             Executive Vice President

Dated:

                                       A-2

<PAGE>

                [FORM OF TRUSTEE'S CERTIFICATE OF AUTHENTICATION]

         This is one of the Notes described in the within-mentioned Indenture.

                                                U.S. BANK, N.A.

                                                By:
                                                    ----------------------------
                                                    Authorized Signatory

Dated:

                                       A-3

<PAGE>

                                 (Back of Note)

              10.5% [Series A] [Series B](2) Senior Notes due 2008

[THIS GLOBAL NOTE IS HELD BY THE DEPOSITARY (AS DEFINED IN THE INDENTURE
GOVERNING THIS NOTE) OR ITS NOMINEE IN CUSTODY FOR THE BENEFIT OF THE BENEFICIAL
OWNERS HEREOF, AND IS NOT TRANSFERABLE TO ANY PERSON UNDER ANY CIRCUMSTANCES
EXCEPT THAT (I) THE TRUSTEE MAY MAKE SUCH NOTATIONS HEREON AS MAY BE REQUIRED
PURSUANT TO SECTION 2.6 OF THE INDENTURE, (II) THIS GLOBAL NOTE MAY BE EXCHANGED
IN WHOLE BUT NOT IN PART PURSUANT TO SECTION 2.6(a) OF THE INDENTURE, (III) THIS
GLOBAL NOTE MAY BE DELIVERED TO THE TRUSTEE FOR CANCELLATION PURSUANT TO SECTION
2.11 OF THE INDENTURE AND (IV) THIS GLOBAL NOTE MAY BE TRANSFERRED TO A
SUCCESSOR DEPOSITARY WITH THE PRIOR WRITTEN CONSENT OF THE COMPANY.](3)

[UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR IN PART FOR NOTES IN DEFINITIVE
FORM, THIS NOTE MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITARY TO A
NOMINEE OF THE DEPOSITARY OR BY A NOMINEE OF THE DEPOSITARY TO THE DEPOSITARY OR
ANOTHER NOMINEE OF THE DEPOSITARY OR BY THE DEPOSITARY OR ANY SUCH NOMINEE TO A
SUCCESSOR DEPOSITARY OR A NOMINEE OF SUCH SUCCESSOR DEPOSITARY. UNLESS THIS
CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST
COMPANY (55 WATER STREET, NEW YORK, NEW YORK) ("DTC"), TO THE COMPANY OR ITS
AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE
ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS MAY BE
REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO
CEDE & CO. OR SUCH OTHER ENTITY AS MAY BE REQUESTED BY AN AUTHORIZED
REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER
HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.](4)

[THE RIGHTS ATTACHING TO THIS REGULATION S TEMPORARY GLOBAL NOTE AND THE
CONDITIONS AND PROCEDURES GOVERNING ITS EXCHANGE FOR DEFINITIVE NOTES,  ARE AS
SPECIFIED IN THE INDENTURE (AS DEFINED HEREIN).  NEITHER THE HOLDER NOR THE

--------

(2) Series A should be replaced with Series B in the Exchange Notes.

(3) To be included only on Global Notes deposited with DTC as Depositary.

(4) To be included only on Global Notes deposited with DTC as Depositary.

                                       A-4

<PAGE>

BENEFICIAL OWNERS OF THIS REGULATION S TEMPORARY GLOBAL NOTE SHALL BE ENTITLED
TO RECEIVE CASH PAYMENTS OF INTEREST DURING THE PERIOD WHICH SUCH HOLDER HOLDS
THIS NOTE. NOTHING IN THIS LEGEND SHALL BE DEEMED TO PREVENT INTEREST FROM
ACCRUING ON THIS NOTE.](5)

[THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED (THE "SECURITIES ACT"), OR ANY STATE SECURITIES LAWS. NEITHER THIS
SECURITY NOR ANY INTEREST OR PARTICIPATION HEREIN MAY BE REOFFERED, SOLD,
ASSIGNED, TRANSFERRED, PLEDGED, ENCUMBERED OR OTHERWISE DISPOSED OF IN THE
ABSENCE OF SUCH REGISTRATION OR UNLESS SUCH TRANSACTION IS EXEMPT FROM, OR NOT
SUBJECT TO, REGISTRATION. THE HOLDER OF THIS SECURITY BY ITS ACCEPTANCE HEREOF
AGREES TO OFFER, SELL OR OTHERWISE TRANSFER THIS SECURITY PRIOR TO THE DATE
WHICH IS TWO YEARS (OR SUCH OTHER PERIOD THAT MAY HEREAFTER BE PROVIDED UNDER
RULE 144(k) UNDER THE SECURITIES ACT AS PERMITTING RESALES OF RESTRICTED
SECURITIES BY NON-AFFILIATES WITHOUT RESTRICTION) AFTER THE LATER OF THE
ORIGINAL ISSUE DATE HEREOF AND THE LAST DATE ON WHICH THE ISSUER OR ANY
AFFILIATE OF THE ISSUER WAS THE OWNER OF THIS SECURITY (OR ANY PREDECESSOR OF
THIS SECURITY) (THE "RESALE RESTRICTION TERMINATION DATE") ONLY (A) TO THE
ISSUER, (B) PURSUANT TO A REGISTRATION STATEMENT WHICH HAS BEEN DECLARED
EFFECTIVE UNDER THE SECURITIES ACT, (C) FOR SO LONG AS THIS SECURITY IS ELIGIBLE
FOR RESALE PURSUANT TO RULE 144A UNDER THE SECURITIES ACT, IN THE UNITED STATES
TO A PERSON IT REASONABLY BELIEVES IS A "QUALIFIED INSTITUTIONAL BUYER" (AS
DEFINED IN RULE 144A UNDER THE SECURITIES ACT) THAT PURCHASES FOR ITS OWN
ACCOUNT OR FOR THE ACCOUNT OF A QUALIFIED INSTITUTIONAL BUYER TO WHOM NOTICE IS
GIVEN THAT THE TRANSFER IS BEING MADE IN RELIANCE ON RULE 144A UNDER THE
SECURITIES ACT, (D) OUTSIDE THE UNITED STATES IN AN OFFSHORE TRANSACTION IN
ACCORDANCE WITH RULE 904 UNDER THE SECURITIES ACT, (E) TO AN INSTITUTIONAL
"ACCREDITED INVESTOR" WITHIN THE MEANING OF SUBPARAGRAPH (a)(1), (2), (3) OR (7)
OF RULE 501 UNDER THE SECURITIES ACT THAT IS ACQUIRING THIS SECURITY FOR ITS OWN
ACCOUNT, OR FOR THE ACCOUNT OF SUCH AN INSTITUTIONAL "ACCREDITED INVESTOR," FOR
INVESTMENT PURPOSES AND NOT WITH A VIEW TO, OR FOR OFFER OR SALE IN CONNECTION
WITH, ANY DISTRIBUTION IN VIOLATION OF THE SECURITIES ACT OR (F) PURSUANT TO
ANOTHER AVAILABLE EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES
ACT, SUBJECT TO THE ISSUER'S AND THE TRUSTEE'S RIGHT PRIOR TO ANY SUCH OFFER,
SALE OR TRANSFER

--------

(5) To be included only on Reg S Temporary Global Notes.

                                       A-5

<PAGE>

TO REQUIRE THE DELIVERY OF AN OPINION OF COUNSEL, CERTIFICATIONS AND/OR OTHER
INFORMATION SATISFACTORY TO EACH OF THEM AND IN EACH OF THE FOREGOING CASES A
CERTIFICATE OF TRANSFER IN THE FORM APPEARING ON THIS SECURITY IS COMPLETED AND
DELIVERED BY THE TRANSFEROR TO THE TRUSTEE AND IN EACH CASE IN ACCORDANCE WITH
APPLICABLE SECURITIES LAWS OF ANY U.S. STATE OR ANY OTHER APPLICABLE
JURISDICTION. THE HOLDER OF THIS SECURITY AGREES THAT IT WILL DELIVER TO EACH
PERSON TO WHOM THIS SECURITY IS TRANSFERRED A NOTICE SUBSTANTIALLY TO THE EFFECT
OF THIS LEGEND. THIS LEGEND WILL BE REMOVED UPON THE REQUEST OF THE HOLDER AFTER
THE RESALE RESTRICTION TERMINATION DATE.](6)

         Capitalized terms used herein shall have the meanings assigned to them
in the Indenture referred to below unless otherwise indicated.

                  1. Interest. Radiologix, Inc., a Delaware corporation (the
"Company"), promises to pay interest on the principal amount of this Note at
10.5% per annum from December 12, 2001 until maturity and shall pay the
Liquidated Damages, if any, payable pursuant to Section 4 of the Registration
Rights Agreement referred to below. The Company will pay interest and Liquidated
Damages, if any, semi-annually in arrears on June 15 and December 15 of each
year, or if any such day is not a Business Day, on the next succeeding Business
Day (each an "Interest Payment Date"). Interest on the Notes will accrue from
the most recent date to which interest has been paid or provided for or, if no
interest has been paid, from the Issue Date; provided, that if there is no
existing Default in the payment of interest, and if this Note is authenticated
between a Record Date (defined below) referred to on the face hereof and the
next succeeding Interest Payment Date, interest shall accrue from such next
succeeding Interest Payment Date; provided, further, that the first Interest
Payment Date shall be June 15, 2002. The Company shall pay interest on overdue
principal and premium, if any, from time to time on demand at the rate then in
effect; it shall pay interest on overdue installments of interest and Liquidated
Damages, if any, (without regard to any applicable grace periods) from time to
time on demand at the same rate to the extent lawful. Interest will be computed
on the basis of a 360-day year of twelve 30-day months.

                  2. Method of Payment. The Company will pay interest on the
Notes (except defaulted interest) and Liquidated Damages, if any, to the Persons
who are registered Holders of Notes at the close of business on June 1 or
December 1 next preceding the Interest Payment Date (each a "Record Date"), even
if such Notes are cancelled after such Record Date and on or before such
Interest Payment Date, except as provided in Section 2.12 of the Indenture (as
defined below) with respect to defaulted interest. The Notes will be payable as
to principal, premium, if any, interest and

--------

(6) To be included only on Transfer Restricted Notes.

                                       A-6

<PAGE>

Liquidated Damages, if any, at the office or agency of the Company maintained in
the Borough of Manhattan, The City and State of New York for such purpose, or,
at the option of the Company, payment of interest and Liquidated Damages, if
any, may be made by check mailed to the Holders at their addresses set forth in
the register of Holders, and provided, that payment by wire transfer of
immediately available funds to an account within the United States will be
required with respect to principal of and interest, premium, if any, and
Liquidated Damages, if any, on all Global Notes. Such payment shall be in such
coin or currency of the United States of America as at the time of payment is
legal tender for payment of public and private debts.

                  3. Paying Agent and Registrar. Initially, U.S. Bank, N.A., the
Trustee under the Indenture, will act as Paying Agent and Registrar. The Company
may change any Paying Agent or Registrar without notice to any Holder. The
Company or any of its Subsidiaries may act in any such capacity.

                  4. Indenture. The Company issued the Notes under an Indenture
dated as of December 12, 2001 ("Indenture") among the Company, the Guarantors
party thereto and the Trustee. The terms of the Notes include those stated in
the Indenture and those made part of the Indenture by reference to the Trust
Indenture Act of 1939, as amended (15 U.S. Code Sections 77aaa-77bbbb). The
Notes are subject to all such terms, and Holders are referred to the Indenture
and such Act for a statement of such terms.

                  5. Optional Redemption.

                  (a) Except as set forth in clause (b) of this Section, the
Company shall not have the option to redeem the Notes pursuant to this Section
prior to December 15, 2005. The Notes will be redeemable for cash at the option
of the Company, in whole or in part, at any time on or after December 15, 2005,
upon not less than 30 days nor more than 60 days prior notice mailed by first
class mail to each Holder at its last registered address, at the following
redemption prices (expressed as percentages of the principal amount) if redeemed
during the 12-month period commencing December 15 of the years indicated below,
in each case (subject to the right of Holders of record on a Record Date to
receive the corresponding interest due (and the corresponding Liquidated
Damages, if any) on the corresponding Interest Payment Date that is on or prior
to such Redemption Date), together with accrued and unpaid interest and
Liquidated Damages, if any, thereon to the Redemption Date:

<Table>
<Caption>
           YEAR                                                           PERCENTAGE
           ----                                                           ----------
<S>                                                                       <C>
           2005.............................................................105.250%
           2006.............................................................102.625%
           2007 and thereafter..............................................100.000%
</Table>

                  (b) Notwithstanding the provisions of clause (a) of this
Section, at any time or from time to time on or prior to December 15, 2004, upon
any Public Equity

                                       A-7

<PAGE>

Offering, up to 35% of the aggregate principal amount of the Notes issued
pursuant to the Indenture may be redeemed at the option of the Company within 90
days of such Public Equity Offering, on not less than 30 days, but not more than
60 days, notice to each Holder of the Notes to be redeemed, with cash from the
Net Cash Proceeds of such Public Equity Offering, at a redemption price equal to
110.500% of the principal amount thereof (subject to the right of Holders of
record on a Record Date to receive the corresponding interest (and the
corresponding Liquidated Damages, if any) due on the Interest Payment Date that
is on or prior to such Redemption Date), together with accrued and unpaid
interest and Liquidated Damages, if any, thereon to the Redemption Date;
provided, however, that immediately following such redemption not less than 65%
of the aggregate principal amount of the Notes originally issued pursuant to the
Indenture on the Issue Date remain outstanding.

                  (c) Notice of redemption will be mailed by first class mail at
least 30 days but not more than 60 days before the Redemption Date to each
Holder whose Notes are to be redeemed at its registered address. Notes in
denominations larger than $1,000 may be redeemed in part but only in integral
multiples of $1,000, unless all of the Notes held by a Holder are to be
redeemed. On and after the Redemption Date, interest (and Liquidated Damages, if
any) ceases to accrue on Notes or portions thereof called for redemption unless
the Company defaults in such payments due on the Redemption Date.

                  6. Mandatory Redemption. The Company shall not be required to
make mandatory redemption payments with respect to the Notes. The Notes shall
not have the benefit of any sinking fund.

                  7. Offers to Purchase.

                  (a) Change of Control. In the event that a Change of Control
has occurred, each Holder of Notes will have the right, at such Holder's option,
pursuant to an offer (subject only to conditions required by applicable law, if
any) by the Company (the "Change of Control Offer"), to require the Company to
repurchase all or any part of such Holder's Notes (provided, that the principal
amount of such Notes must be $1,000 or an integral multiple thereof) on a date
(the "Change of Control Purchase Date") that is no later than 60 days after the
occurrence of such Change of Control, at a cash price equal to 101% of the
principal amount thereof (the "Change of Control Purchase Price"), together with
accrued and unpaid interest and Liquidated Damages, if any, to the Change of
Control Purchase Date. The Change of Control Offer shall be made within 30 days
following a Change of Control and shall remain open for 20 Business Days
following its commencement (the "Change of Control Offer Period") or such other
period as may be required by applicable law. Upon expiration of the Change of
Control Offer Period, the Company promptly shall purchase all Notes properly
tendered in response to the Change of Control Offer.

                  On or before the Change of Control Purchase Date, the Company
shall (i) accept for payment Notes or portions thereof properly tendered and not
validly withdrawn pursuant to the Change of Control Offer, (ii) deposit with the
Paying Agent

                                       A-8

<PAGE>

an amount in cash sufficient to pay the Change of Control Purchase Price
(together with accrued and unpaid interest and Liquidated Damages, if any) of
all Notes so tendered and (iii) deliver to the Trustee the Notes so accepted
together with an Officers' Certificate listing the Notes or portions thereof
being purchased by the Company. The Paying Agent promptly shall pay the Holders
of Notes so accepted an amount equal to the Change of Control Purchase Price
(together with accrued and unpaid interest and Liquidated Damages, if any) and
the Trustee promptly shall authenticate and deliver to such Holders a new Note
equal in principal amount to any unpurchased portion of the Note surrendered.
Any Notes not so accepted will be delivered promptly by the Company to the
Holder thereof. The Company publicly will announce the results of the Change of
Control Offer on or as soon as practicable after the Change of Control Purchase
Date.

                  (b) Asset Sale. Except as otherwise set forth in Section 4.14
of the Indenture, the Company and the Guarantors shall not, and neither the
Company nor the Guarantors shall permit any of their respective Subsidiaries to,
in one or a series of related transactions, convey, sell, transfer, assign or
otherwise dispose of, directly or indirectly, any of their property, business or
assets, including by merger or consolidation (in the case of a Guarantor or a
Subsidiary of the Company), and including any sale or other transfer or issuance
of any Equity Interests of any Subsidiary of the Company, whether by the Company
or one of its Subsidiaries or through the issuance, sale or transfer of Equity
Interests by a Subsidiary of the Company, and including any sale and leaseback
transaction (any of the foregoing, an "Asset Sale"), unless: (1) at least 75% of
the total consideration for such Asset Sale or series of related Asset Sales
consists of cash or Cash Equivalents; and (2) the Company receives or such
Subsidiary receives, as applicable, fair market value for such Asset Sale, such
determination to be made in good faith by the Company's Board of Directors for
Asset Sales exceeding $2,000,000. Solely for purposes of (1) above, (a) any
Indebtedness (other than Subordinated Indebtedness) of the Company or such
Subsidiary that is expressly assumed by the transferee in such Asset Sale and
with respect to which the Company is and its Subsidiaries are fully and
unconditionally released from any and all obligations in connection therewith,
(b) property that within 30 days of such Asset Sale is converted into cash or
Cash Equivalents; provided, that such cash and Cash Equivalents shall be treated
as Net Cash Proceeds attributable to the original Asset Sale for which such
property was received, and (c) the fair market value, as determined in good
faith by the Board of Directors, of any asset (other than securities) received
by the Company or any Subsidiary that, in the good faith reasonable judgment of
the Company's Board of Directors, will immediately constitute or be a part of a
Related Business shall be deemed to be cash or Cash Equivalents. Within 360 days
following such Asset Sale, the Net Cash Proceeds therefrom are: (a) invested in
fixed assets and property (other than notes, bonds, obligations and other
securities, except in connection with the acquisition of a Guarantor in a
Related Business) that in the good faith reasonable judgment of the Company's
Board of Directors will immediately constitute or be a part of a Related
Business of the Company or such Subsidiary (if it continues to be a Subsidiary)
immediately following such transaction; or (b) used to retire Purchase Money
Indebtedness secured by the asset that was the subject of the Asset Sale or to

                                       A-9

<PAGE>

permanently reduce the amount of Indebtedness outstanding under the Credit
Agreement; or (c) applied to the optional redemption of the Notes in accordance
with the terms of the Indenture and the Company's other Indebtedness ranking on
a parity with the Notes and with similar provisions requiring the Company to
redeem such Indebtedness with the proceeds from such Asset Sale, pro rata in
proportion to the respective principal amounts (or accreted values in the case
of Indebtedness issued with an original issue discount) of the Notes and such
other Indebtedness then outstanding. Pending the final application of any Net
Cash Proceeds, the Company may temporarily reduce revolving credit borrowings or
otherwise invest the Net Cash Proceeds in any manner that is not prohibited by
the Indenture.

                  The accumulated Net Cash Proceeds from Asset Sales not applied
as set forth in (a), (b) or (c) of the preceding paragraph shall constitute
"Excess Proceeds". Within 30 days after the date that the amount of Excess
Proceeds exceeds $10,000,000, the Company shall apply the Excess Proceeds (the
"Asset Sale Offer Amount") to the repurchase of the Notes and such other
Indebtedness ranking on a parity with the Notes and with similar provisions
requiring the Company to make an offer to purchase such Indebtedness with the
proceeds from such Asset Sale pursuant to a cash offer (subject only to
conditions required by applicable law, if any) (pro rata in proportion to the
respective principal amounts (or accreted values in the case of Indebtedness
issued with an original issue discount) of the Notes and such other Indebtedness
then outstanding) (the "Asset Sale Offer") at a purchase price of 100% of the
principal amount (or accreted value in the case of Indebtedness issued with an
original issue discount) (the "Asset Sale Offer Price") together with accrued
and unpaid interest and Liquidated Damages, if any, to the date of payment. Each
Asset Sale Offer shall remain open for 20 Business Days following its
commencement (the "Asset Sale Offer Period"). Upon expiration of the Asset Sale
Offer Period, the Company shall apply the Asset Sale Offer Amount plus an amount
equal to accrued and unpaid interest and Liquidated Damages, if any, to the
purchase of all Indebtedness properly tendered in accordance with the provisions
hereof (on a pro rata basis if the Asset Sale Offer Amount is insufficient to
purchase all Indebtedness so tendered) at the Asset Sale Offer Price (together
with accrued interest and Liquidated Damages, if any). To the extent that the
aggregate amount of Notes and such other pari passu Indebtedness tendered
pursuant to an Asset Sale Offer is less than the Asset Sale Offer Amount, the
Company may use any remaining Net Cash Proceeds as otherwise permitted by the
Indenture (other than for making Restricted Payments that are not Investments)
and following the consummation of each Asset Sale Offer the Excess Proceeds
amount shall be reset to zero.

                  8. Denominations, Transfer, Exchange. The Notes are in
registered form without coupons in denominations of $1,000 and integral
multiples of $1,000. The transfer of Notes may be registered and Notes may be
exchanged as provided in the Indenture. The Registrar and the Trustee may
require a Holder, among other things, to furnish appropriate endorsements and
transfer documents and the Company may require a Holder to pay any taxes and
fees required by law or permitted by the Indenture. The Company need not
exchange or register the transfer of any Note or portion of a Note selected for
redemption, except for the unredeemed portion of any Note being redeemed

                                      A-10

<PAGE>

in part. Also, it need not exchange or register the transfer of any Notes for a
period of 15 days before a selection of Notes to be redeemed or during the
period between a Record Date and the corresponding Interest Payment Date.

                  9. Persons Deemed Owners. The registered Holder of a Note may
be treated as its owner for all purposes.

                  10. Amendment, Supplement and Waiver. Subject to certain
exceptions, the Indenture, the Notes or the Guarantees may be amended or
supplemented with the consent of the Holders of not less than a majority in
aggregate principal amount of the then outstanding Notes, and any existing
Default or compliance with any provision of the Indenture, the Notes or the
Guarantees may be waived with the consent of the Holders of a majority in
aggregate principal amount of the then outstanding Notes. Without the consent of
any Holder of a Note, the Indenture, the Notes or the Guarantees may be amended
or supplemented (a) to cure any ambiguity, defect or inconsistency, (b) to add
to the covenants of the Company or the Guarantors for the benefit of the
Holders, or to surrender any right or power conferred upon the Company or the
Guarantors by the Indenture or herein; (c) to provide for collateral for or
additional Guarantors of the Notes; (d) to evidence the succession of another
Person to the Company, and the assumption by any such successor of the
obligations of the Company, herein and in the Indenture in accordance with the
terms of the Indenture; (e) to comply with the TIA; (f) to evidence the
succession of another corporation to any Guarantor and assumption by any such
successor of the Guarantee of such Guarantor pursuant to the Indenture; (g) to
evidence the release of any Guarantor; (h) to evidence and provide for the
acceptance of appointment of a successor Trustee with respect to the Notes; (i)
in any other case where a supplemental indenture is required or permitted to be
entered into pursuant to the provisions of the Indenture without the consent of
any Holder; (j) to provide for the issuance and authorization of the Exchange
Notes; or (k) to make any change that does not adversely affect the rights of
any Holder.

                  11. Defaults and Remedies. The Indenture provides that each of
the following constitutes an Event of Default:

                  (i) the Company's failure to pay any installment of interest
(or Liquidated Damages, if any) on the Notes as and when the same becomes due
and payable and the continuance of any such failure for 30 days;

                  (ii) the Company's failure to pay all or any part of the
principal of, or premium, if any, on the Notes when and as the same becomes due
and payable at maturity, redemption, by acceleration or otherwise, including,
without limitation, payment of the Change of Control Purchase Price or the Asset
Sale Offer Price on Notes validly tendered and not properly withdrawn pursuant
to a Change of Control Offer or Asset Sale Offer, as applicable;

                  (iii) the Company's failure or the failure by any of its
Subsidiaries to observe or perform any other covenant or agreement contained in
the Notes or the

                                      A-11

<PAGE>

Indenture and, except for the provisions under Section 4.3 and 4.14 and Articles
V and X of the Indenture, the continuance of such failure for a period of 60
days after written notice is given to the Company by the Trustee or to the
Company and the Trustee by the Holders of at least 25% in aggregate principal
amount of the Notes outstanding;

                  (iv) a decree, judgment, or order by a court of competent
jurisdiction shall have been entered adjudicating the Company or any of its
Significant Subsidiaries as bankrupt or insolvent, or approving as properly
filed a petition seeking reorganization of the Company or any of its Significant
Subsidiaries under any bankruptcy or similar law, and such decree or order shall
have continued undischarged and unstayed for a period of 60 days; or a decree,
judgment or order of a court of competent jurisdiction appointing a receiver,
liquidator, trustee, or assignee in bankruptcy or insolvency for the Company,
any of its Significant Subsidiaries, or any substantial part of the property of
any such Person, or for the winding up or liquidation of the affairs of any such
Person, shall have been entered, and such decree, judgment, or order shall have
remained in force undischarged and unstayed for a period of 60 days;

                  (v) the Company or any of its Significant Subsidiaries shall
institute proceedings to be adjudicated a voluntary bankrupt, or shall consent
to the filing of a bankruptcy proceeding against it, or shall file a petition or
answer or consent seeking reorganization under any bankruptcy or similar law or
similar statute, or shall consent to the filing of any such petition, or shall
consent to the appointment of a custodian, receiver, liquidator, trustee, or
assignee in bankruptcy or insolvency of it or any substantial part of its assets
or property, or shall make a general assignment for the benefit of creditors, or
shall admit in writing its inability to pay its debts generally as they become
due, or take any corporate action in furtherance of any of the foregoing;

                  (vi) a default in the Company's Indebtedness or the
Indebtedness of any of its Subsidiaries with an aggregate amount outstanding in
excess of $10,000,000 (a) resulting from the failure to pay principal at
maturity or (b) as a result of which the maturity of such Indebtedness has been
accelerated prior to its stated maturity;

                  (vii) unsatisfied judgments not covered by insurance
aggregating in excess of $5,000,000 at any one time rendered against the Company
or any of its Subsidiaries and not stayed, bonded or discharged within 60 days
after such judgment became final and nonappealable; and

                  (viii) any Guarantee of a Guarantor that is a Significant
Subsidiary ceases to be in full force and effect or becomes unenforceable or
invalid or is declared null and void (other than in accordance with the terms of
the Guarantee and the Indenture) or any Guarantor denies or disaffirms its
obligations under its Guarantee.

                  12. Trustee Dealings with Company. The Trustee, in its
individual or any other capacity, may make loans to, accept deposits from, and
perform services for the Company or its Affiliates, and may otherwise deal with
the Company or its Affiliates, as if it were not the Trustee.

                                      A-12

<PAGE>

                  13. No Recourse Against Others. No direct or indirect
incorporator, stockholder, employee, officer or director, as such, past, present
or future, of the Company or any Guarantor, or any successor entity, shall have
any personal liability in respect of the obligations of the Company or the
Guarantors under the Notes or the Indenture solely by reason of his or its
status as such incorporator, stockholder, employee, officer or director;
provided, that this Section 13 shall in no way limit the obligation of any
Guarantor pursuant to any Guarantee of the Notes. Each Securityholder by
accepting a Note waives and releases all such liability. The waiver and release
are part of the consideration for the issuance of the Notes.

                  14. Authentication. This Note shall not be valid until
authenticated by the manual signature of the Trustee or an authenticating agent.

                  15. Abbreviations. Customary abbreviations may be used in the
name of a Holder or an assignee, such as: TEN COM (= tenants in common), TEN ENT
(= tenants by the entireties), JT TEN (= joint tenants with right of
survivorship and not as tenants in common), CUST (= Custodian), and U/G/M/A (=
Uniform Gifts to Minors Act).

                  16. Additional Rights of Holders of Transfer Restricted
Notes.(7) In addition to the rights provided to Holders of Notes under the
Indenture, Holders of Transfer Restricted Notes shall have all the rights set
forth in the Registration Rights Agreement dated as of the date of the
Indenture, among the Company, the Guarantors and the Initial Purchasers (the
"Registration Rights Agreement").

                  17. CUSIP Numbers. Pursuant to a recommendation promulgated by
the Committee on Uniform Security Identification Procedures, the Company has
caused CUSIP numbers to be printed on the Notes, and the Trustee may use CUSIP
numbers in notices of redemption as a convenience to Holders. No representation
is made as to the accuracy of such numbers either as printed on the Notes or as
contained in any notice of redemption and reliance may be placed only on the
other identification numbers placed thereon, and any such redemption shall not
be affected by any defect in or omission of such numbers.

                  18. Notation of Guarantee. As more fully set forth in the
Indenture, each of the Guarantors from time to time, in accordance with the
provisions of the Indenture, shall irrevocably and unconditionally and jointly
and severally guarantee, on a senior basis, in accordance with Article XI of the
Indenture, to each Holder of a Note authenticated and delivered by the Trustee
and to the Trustee and its successors and assigns, that: (a) the principal of,
and premium, if any, Liquidated Damages, if any, and interest on the Notes will
be paid in full when due, whether at the Maturity Date or Interest Payment Date,
by acceleration, call for redemption, upon a Change of Control

--------

(7) To be included only on Transfer Restricted Notes.

                                      A-13

<PAGE>

Offer, upon an Asset Sale Offer or otherwise; (b) all other obligations of the
Company to the Holders or the Trustee under the Indenture or under the Notes
will be promptly paid in full or performed, all in accordance with the terms of
the Indenture and the Notes; and (c) in case of any extension of time of payment
or renewal of any Notes or any of such other obligations, the same will be
promptly paid in full when due or performed in accordance with the terms of the
extension or renewal, whether at maturity, by acceleration, call for redemption,
upon a Change of Control Offer, upon an Asset Sale Offer or otherwise. Such
Guarantees shall cease to apply, and shall be null and void, with respect to any
Guarantor who, pursuant to Article XI of the Indenture, is released from its
Guarantee or whose Guarantee otherwise ceases to be applicable pursuant to the
terms of the Indenture.

                  When a successor assumes all the obligations of its
predecessor under the Notes and the Indenture, the predecessor will be released
from those obligations.

                  19. Governing Law. THE INDENTURE AND THE NOTES SHALL BE
GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK,
INCLUDING, WITHOUT LIMITATION, SECTIONS 5-1401 AND 5-1402 OF THE NEW YORK
GENERAL OBLIGATIONS LAW AND RULE 327(b) OF THE NEW YORK CIVIL PRACTICE LAWS AND
RULES.

                  The Company will furnish to any Holder upon written request
and without charge a copy of the Indenture and/or the Registration Rights
Agreement. Requests may be made to:

                           Radiologix, Inc.
                           3600 Chase Tower
                           2200 Ross Avenue
                           Dallas, Texas 75201
                           Attention: Chief Financial Officer
                           Telephone No.: (214) 303-2777

                                      A-14

<PAGE>

                                 ASSIGNMENT FORM

To assign this Note, fill in the form below: (I) or (we) assign and transfer
this Note to

--------------------------------------------------------------------------------
                  (Insert assignee's soc. sec. or tax I.D. no.)

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------
              (Print or type assignee's name, address and zip code)

and irrevocably appoint ________________________________________________________
to transfer this Note on the books of the Company. The agent may substitute
another to act for him.

Date:                          Your Signature:
      -----------------                       ----------------------------------
                                              (Sign exactly as your name appears
                                              on the face of this Note)

Signature Guarantee*

--------------------------------------------------------------------------------

*NOTICE: The Signature must be guaranteed by an Institution which is a member of
one of the following recognized signature Guarantee Programs: (i) The Securities
Transfer Agent Medallion Program (STAMP); (ii) The New York Stock Exchange
Medallion Program (MNSP); (iii) The Stock Exchange Medallion Program (SEMP); or
(iv) in such other guarantee program acceptable to the Trustee.

                                      A-15

<PAGE>

                       OPTION OF HOLDER TO ELECT PURCHASE

         If you want to elect to have this Note purchased by the Company
pursuant to Section 4.14 or 10.1 of the Indenture, check the box below:

                  [ ]  Section 4.14               [ ]  Section 10.1

         If you want to elect to have only part of the Note purchased by the
Company pursuant to Section 4.14 or Section 10.1 of the Indenture, state the
amount you elect to have purchased (in denominations of $1,000 only, except if
you have elected to have all of your Notes purchased): $___________

Date:                          Your Signature:
      -----------------                       ----------------------------------
                                              (Sign exactly as your name appears
                                              on the face of this Note)

Signature Guarantee*

--------------------------------------------------------------------------------

*NOTICE: The Signature must be guaranteed by an Institution which is a member of
one of the following recognized signature Guarantee Programs: (i) The Securities
Transfer Agent Medallion Program (STAMP); (ii) The New York Stock Exchange
Medallion Program (MNSP); (iii) The Stock Exchange Medallion Program (SEMP); or
(iv) in such other guarantee program acceptable to the Trustee.

                                      A-16

<PAGE>
             SCHEDULE OF EXCHANGES OF INTERESTS IN THE GLOBAL NOTE(8)

         The following exchanges of a part of this Global Note for an interest
in another Global Note or for a Definitive Note, or exchanges of a part of
another Global Note or Definitive Note for an interest in this Global Note, have
been made:

<Table>
<Caption>
                                                                        Principal Amount of
                                                                         this Global Note            Signature of
                        Amount of decrease in   Amount of increase in     following such        authorized officer of
                          Principal Amount of    Principal Amount of         decrease              Trustee or Note
   Date of Exchange        this Global Note        this Global Note        (or increase)              Custodian
   ----------------     ---------------------   ---------------------   -------------------     ---------------------
<S>                     <C>                     <C>                     <C>                     <C>

</Table>

--------

(8) This should be included only if the Note is issued in global form.

                                      A-17

<PAGE>

                                    GUARANTEE

                  The Guarantors listed below (hereinafter referred to as the
"Guarantors," which term includes any successors or assigns under the Indenture,
dated the date hereof, among the Guarantors, the Company (defined below) and
U.S. Bank, N.A., as trustee (the "Indenture") and any additional Guarantors),
jointly and severally, irrevocably and unconditionally guarantee, in accordance
with Article XI of the Indenture: (i) the due and punctual payment of the
principal of, premium, if any, and interest and Liquidated Damages, if any, on
the 10.5% Senior Notes due 2008 (the "Notes") of Radiologix, Inc., a Delaware
corporation (the "Company"), whether at the Maturity Date, or Interest Payment
Date, by acceleration, call for redemption, upon a Change of Control Offer, upon
an Asset Sale Offer or otherwise; (ii) the due and punctual payment or
performance of all other obligations of the Company to the Holders or the
Trustee under the Indenture and the Notes, all in accordance with the terms set
forth in Article XI of the Indenture; (iii) in case of any extension of time of
payment or renewal of any Notes or any of such other obligations, that the same
will be promptly paid in full when due or performed in accordance with the terms
of the extension or renewal, whether at maturity, by acceleration, call for
redemption, upon a Change of Control Offer, upon an Asset Sale Offer or
otherwise; and (iv) the payment of any and all costs and expenses (including
attorneys' fees) incurred by the Trustee in enforcing any rights under this
Guarantee.

                  The obligations of each Guarantor to the Holders and to the
Trustee pursuant to this Guarantee and the Indenture are expressly set forth in
Article XI of the Indenture and reference is hereby made to such Indenture for
the precise terms of this Guarantee.

                  No direct or indirect stockholder, employee, officer or
director, as such, past, present or future, of any of the Guarantors, or any
successor entity, shall have any personal liability in respect of the
obligations of any of the Guarantors under the Guarantees or the Indenture
solely by reason of his or its status as such stockholder, employee, officer or
director; provided, that this provision shall in no way limit the obligation of
any Guarantor pursuant to this Guarantee.

                  This is a continuing Guarantee and shall remain in full force
and effect and shall be binding upon each Guarantor and its successors and
assigns until full and final payment of all of the Company's obligations under
the Notes and Indenture or until released or legally defeased in accordance with
the Indenture and shall inure to the benefit of the successors and assigns of
the Trustee and the Holders, and, in the event of any transfer or assignment of
rights by any Holder or the Trustee, the rights and privileges herein conferred
upon that party shall automatically extend to and be vested in such transferee
or assignee, all

                                      A-18

<PAGE>

subject to the terms and conditions hereof. This is a Guarantee of payment and
not of collectibility.

                  This Guarantee shall not be valid or obligatory for any
purpose until the certificate of authentication on the Note upon which this
Guarantee is noted shall have been executed by the Trustee under the Indenture
by the manual signature of one of its authorized officers.

                  The obligations of each Guarantor under its Guarantee shall be
limited to the extent necessary to insure that it does not constitute a
fraudulent conveyance under applicable law.

                  THE TERMS OF ARTICLE XI OF THE INDENTURE IS  INCORPORATED
HEREIN BY REFERENCE.

                  Capitalized terms used herein have the same meanings given in
the Indenture unless otherwise indicated.

                                      A-19

<PAGE>

                  IN WITNESS WHEREOF, each of the Guarantors has caused this
instrument to be duly executed.

Dated:

                                          IDE IMAGING PARTNERS, INC.

                                          By:
                                              ----------------------------------
                                              Name:
                                              Title:

                                          PACIFIC IMAGING PARTNERS, INC.

                                          By:
                                              ----------------------------------
                                              Name:
                                              Title:

                                          QUESTAR IMAGING, INC.

                                          By:
                                              ----------------------------------
                                              Name:
                                              Title:

                                          WB&A IMAGING PARTNERS, INC.

                                          By:
                                              ----------------------------------
                                              Name:
                                              Title:

                                          TREASURE COAST IMAGING PARTNERS, INC.

                                          By:
                                              ----------------------------------
                                              Name:
                                              Title:

                                          RADIOLOGIX SERVICES, INC.

                                          By:
                                              ----------------------------------
                                              Name:
                                              Title:

<PAGE>

                                            ADVANCED IMAGING PARTNERS, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

                                            MID ROCKLAND IMAGING PARTNERS, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

                                            RADIOLOGY AND NUCLEAR MEDICINE
                                            IMAGING PARTNERS, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

                                            COMMUNITY IMAGING PARTNERS, INC

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

                                            VALLEY IMAGING PARTNERS, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

                                            SAN JOSE IMAGING PARTNERS, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

<PAGE>

                                            ADVANCED RADIOLOGY, LLC

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

                                            ADVANCED MEDICAL IMAGING, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

                                            M&S IMAGING PARTNERS I, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

                                            M&S IMAGING PARTNERS, L.P.

                                            By: M&S Imaging Partners I, Inc.,
                                                its general partner

                                                     By:
                                                         ----------------------
                                                         Name:
                                                         Title:

                                            QUESTAR CLEVELAND, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

                                            QUESTAR TAMPA, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

<PAGE>
                                            QUESTAR ORLANDO, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

                                            ROCKY MOUNTAIN OPENSCAN MRI, LLC

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

                                            PREMIER ADVANCED IMAGING NETWORK,
                                            LTD.

                                            By: Questar Orlando, Inc., its
                                                general partner

                                                By:
                                                    ---------------------------
                                                    Name:
                                                    Title:

                                            QUESTAR IMAGING MB, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

                                            QUESTAR KANSAS, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

                                            QUESTAR PVH, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

<PAGE>
                                            QUESTAR SAN FRANCISCO, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

                                            QUESTAR HENDERSON, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

                                            QUESTAR TRISTATES, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

                                            QUESTAR PHILADELPHIA, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

                                            QUESTAR WESTWOOD, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

                                            QUESTAR DULUTH, INC

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

                                            QUESTAR LINCOLN, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

<PAGE>
                                            QUESTAR H F M C, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

                                            QUESTAR PALM SPRINGS, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

                                            QUESTAR ATLANTA, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

                                            QUESTAR MT. LAUREL, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

                                            QUESTAR LOWER BUCKS, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

                                            QUESTAR TOLEDO, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

                                            QUESTAR SOUTH CHICAGO, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

<PAGE>
                                            QUESTAR NORTH GEORGIA, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

                                            QUESTAR LOS ALAMITOS, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

                                            QUESTAR DES PLAINES, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

                                            QUESTAR VICTORVILLE, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

                                            QUESTAR COLUMBUS, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

                                            QUESTAR NAPERVILLE, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

                                            QUESTAR QUAKERTOWN, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

<PAGE>

                                            QUESTAR TUCSON, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

<PAGE>
                                            M&S IMAGING INVESTMENTS, INC.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

<PAGE>

                                    EXHIBIT B
                         FORM OF CERTIFICATE OF TRANSFER

Radiologix, Inc.
3600 Chase Tower
2200 Ross Avenue
Dallas, Texas 75201
Attention: Chief Financial Officer

U.S. Bank, N.A.
180 East Fifth Street
St. Paul, Minnesota 55101
Attention: Corporate Trust Department

         Re:  10.5% Senior Notes due 2008

Ladies and Gentlemen:

         Reference is hereby made to the Indenture, dated as of December 12,
2001 (the "Indenture"), among Radiologix, Inc., as issuer (the "Company"), the
Guarantors party thereto and U.S. Bank, N.A., as trustee. Capitalized terms used
but not defined herein shall have the meanings given to them in the Indenture.
______________, (the "Transferor") owns and proposes to transfer the Note[s] or
interest[s] in such Note[s] specified in Annex A hereto, in the principal amount
of $___________ in such Note[s] or interest[s] (the "Transfer"), to __________
(the "Transferee"), as further specified in Annex A hereto. In connection with
the Transfer, the Transferor hereby certifies that:

[CHECK ALL THAT APPLY]

1. [ ] CHECK IF TRANSFEREE WILL TAKE DELIVERY OF A BENEFICIAL INTEREST IN THE
144A GLOBAL NOTE OR A DEFINITIVE NOTE PURSUANT TO RULE 144A. The Transfer is
being effected pursuant to and in accordance with Rule 144A under the United
States Securities Act of 1933, as amended (the "Securities Act"), and,
accordingly, the Transferor hereby further certifies that the beneficial
interest or Definitive Note is being transferred to a Person that the Transferor
reasonably believed and believes is purchasing the beneficial interest or
Definitive Note for its own account, or for one or more accounts with respect to
which such Person exercises sole investment discretion, and such Person and each
such account is a "qualified institutional buyer" within the meaning of Rule
144A in a transaction meeting the requirements of Rule 144A and such Transfer is
in compliance with any applicable blue sky

                                       B-1

<PAGE>

securities laws of any State of the United States. Upon consummation of the
proposed Transfer in accordance with the terms of the Indenture, the transferred
beneficial interest or Definitive Note will be subject to the restrictions on
transfer enumerated in the Private Placement Legend printed on the 144A Global
Note and/or the Definitive Note and in the Indenture and the Securities Act.

2. [ ] CHECK IF TRANSFEREE WILL TAKE DELIVERY OF A BENEFICIAL INTEREST IN THE
REGULATION S GLOBAL NOTE OR A DEFINITIVE NOTE PURSUANT TO REGULATION S. The
Transfer is being effected pursuant to and in accordance with Rule 903 or Rule
904 under the Securities Act and, accordingly, the Transferor hereby further
certifies that (i) the Transfer is not being made to a person in the United
States and (x) at the time the buy order was originated, the Transferee was
outside the United States or such Transferor and any Person acting on its behalf
reasonably believed and believes that the Transferee was outside the United
States or (y) the transaction was executed in, on or through the facilities of a
designated offshore securities market and neither such Transferor nor any Person
acting on its behalf knows that the transaction was prearranged with a buyer in
the United States, (ii) no directed selling efforts have been made in
contravention of the requirements of Rule 903(b) or Rule 904(b) of Regulation S
under the Securities Act, (iii) the transaction is not part of a plan or scheme
to evade the registration requirements of the Securities Act and (iv) if the
proposed Transfer is being made prior to the expiration of the Distribution
Compliance Period, the Transfer is not being made to a U.S. Person or for the
account or benefit of a U.S. Person (other than an Initial Purchaser) and the
interest transferred will be held immediately thereafter through Euroclear or
Clearstream. Upon consummation of the proposed Transfer in accordance with the
terms of the Indenture, the transferred beneficial interest or Definitive Note
will be subject to the restrictions on transfer enumerated in the Private
Placement Legend printed on the Regulation S Global Note and/or the Definitive
Note and in the Indenture and the Securities Act.

3. [ ] CHECK AND COMPLETE IF TRANSFEREE WILL TAKE DELIVERY OF A BENEFICIAL
INTEREST IN A DEFINITIVE NOTE PURSUANT TO ANY PROVISION OF THE SECURITIES ACT
OTHER THAN RULE 144A OR REGULATION S. The Transfer is being effected in
compliance with the transfer restrictions applicable to beneficial interests in
Restricted Global Notes and Restricted Definitive Notes and pursuant to and in
accordance with the Securities Act and any applicable blue sky securities laws
of any State of the United States, and accordingly the Transferor hereby further
certifies that (check one):

         (a) [ ] Such Transfer is being effected pursuant to and in accordance
         with Rule 144 under the Securities Act; or

                                       B-2

<PAGE>

         (b) [ ] Such Transfer is being effected to the Company or a subsidiary
         thereof; or

         (c) [ ] Such Transfer is being effected pursuant to an effective
         registration statement under the Securities Act and in compliance with
         the prospectus delivery requirements of the Securities Act; or

         (d) [ ] such Transfer is being effected to an Institutional Accredited
         Investor and pursuant to an exemption from the registration
         requirements of the Securities Act other than Rule 144A, Rule 144 or
         Rule 904, and the Transferor hereby further certifies that it has not
         engaged in any general solicitation within the meaning of Regulation D
         under the Securities Act and the Transfer complies with the transfer
         restrictions applicable to beneficial interests in a Restricted Global
         Note or Restricted Definitive Note and the requirements of the
         exemption claimed, which certification is supported by (1) a
         certificate executed by the Transferee in a form of Exhibit D to the
         Indenture and (2) if such Transfer is in respect of a principal amount
         of Notes at the time of transfer of less than $250,000, an Opinion of
         Counsel provided by the Transferor or the Transferee (a copy of which
         the Transferor has attached to this certification and provided to the
         Company, which has confirmed its acceptability), to the effect that
         such Transfer is in compliance with the Securities Act. Upon
         consummation of the proposed Transfer in accordance with the terms of
         the Indenture, the Definitive Note will be subject to the restrictions
         on transfer enumerated in the Private Placement Legend printed on the
         Definitive Notes and in the Indenture and the Securities Act.

4. [ ] CHECK IF TRANSFEREE WILL TAKE DELIVERY OF A BENEFICIAL INTEREST IN AN
UNRESTRICTED GLOBAL NOTE OR OF AN UNRESTRICTED DEFINITIVE NOTE.

         (a) [ ] CHECK IF TRANSFER IS PURSUANT TO RULE 144. (i) The Transfer is
being effected pursuant to and in accordance with Rule 144 under the Securities
Act and in compliance with the transfer restrictions contained in the Indenture
and any applicable blue sky securities laws of any State of the United States
and (ii) the restrictions on transfer contained in the Indenture and the Private
Placement Legend are not required in order to maintain compliance with the
Securities Act. Upon consummation of the proposed Transfer in accordance with
the terms of the Indenture, the transferred beneficial interest or Definitive
Note will no longer be subject to the restrictions on transfer enumerated in the
Private Placement Legend printed on the Restricted Global Notes, on Restricted
Definitive Notes and in the Indenture and the Securities Act.

                                       B-3

<PAGE>

         (b) [ ] CHECK IF TRANSFER IS PURSUANT TO REGULATION S. (i) The Transfer
is being effected pursuant to and in accordance with Rule 903 or Rule 904 under
the Securities Act and in compliance with the transfer restrictions contained in
the Indenture and any applicable blue sky securities laws of any State of the
United States and (ii) the restrictions on transfer contained in the Indenture
and the Private Placement Legend are not required in order to maintain
compliance with the Securities Act. Upon consummation of the proposed Transfer
in accordance with the terms of the Indenture, the transferred beneficial
interest or Definitive Note will no longer be subject to the restrictions on
transfer enumerated in the Private Placement Legend printed on the Restricted
Global Notes, on Restricted Definitive Notes and in the Indenture and the
Securities Act.

         (c) [ ] CHECK IF TRANSFER IS PURSUANT TO OTHER EXEMPTION. (i) The
Transfer is being effected pursuant to and in compliance with an exemption from
the registration requirements of the Securities Act other than Rule 144, Rule
903 or Rule 904 and in compliance with the transfer restrictions contained in
the Indenture and any applicable blue sky securities laws of any State of the
United States and (ii) the restrictions on transfer contained in the Indenture
and the Private Placement Legend are not required in order to maintain
compliance with the Securities Act. Upon consummation of the proposed Transfer
in accordance with the terms of the Indenture, the transferred beneficial
interest or Definitive Note will not be subject to the restrictions on transfer
enumerated in the Private Placement Legend printed on the Restricted Global
Notes or Restricted Definitive Notes and in the Indenture.

                                       B-4

<PAGE>

This certificate and the statements contained herein are made for your benefit
and the benefit of the Company.

                                                 Dated:
----------------------------

----------------------------
[Insert Name of Transferor]

By:
    -------------------------
    Name:
    Title:

                                       B-5

<PAGE>

                       ANNEX A TO CERTIFICATE OF TRANSFER

1.       The Transferor owns and proposes to transfer the following:

[CHECK ONE OF (a) OR (b)]

         (a)      [ ]      a beneficial interest in the:

                  (i)               144A Global Note (CUSIP 75040K AA 7), or

                  (ii)              501 Global Note (CUSIP 75040K AB 5), or

                  (iii)             Reg S Global Note (CUSIP U7492W AA 4); or

         (b)      [ ]      a Restricted Definitive Note.

2.       After the Transfer the Transferee will hold:

[CHECK ONE]

         (a)      [ ]      a beneficial interest in the:

                  (i)      [ ]     144A Global Note (CUSIP 75040K AA 7), or

                  (ii)     [ ]     501 Global Note (CUSIP 75040K AB 5), or

                  (iii)    [ ]     Reg S Global Note (CUSIP U7492W AA 4),

                  (iv)     [ ]     Unrestricted Global Note (CUSIP 75040K AC 3);
                                   or

         (b)      [ ]      a Restricted Definitive Note; or

         (c)      [ ]      an Unrestricted Definitive Note,

in accordance with the terms of the Indenture.

                                       B-6

<PAGE>

                                    EXHIBIT C
                         FORM OF CERTIFICATE OF EXCHANGE

Radiologix, Inc.
3600 Chase Tower
2200 Ross Avenue
Dallas, Texas 75201
Attention: Chief Financial Officer

U.S. Bank, N.A.
180 East Fifth Street
St. Paul, Minnesota 55101
Attention: Corporate Trust Department

         Re: 10.5% Senior Notes due 2008

Ladies and Gentlemen:

                  Reference is hereby made to the Indenture, dated as of
December 12, 2001 (the "Indenture"), between Radiologix, Inc., as issuer (the
"Company"), the Guarantors party thereto and U.S. Bank, N.A., as trustee.
Capitalized terms used but not defined herein shall have the meanings given to
them in the Indenture.

                  ____________, (the "Owner") owns and proposes to exchange the
Note[s] or interest[s] in such Note[s] specified herein, in the principal amount
of $____________ in such Note[s] or interest[s] (the "Exchange"). In connection
with the Exchange, the Owner hereby certifies that:

                  1. EXCHANGE OF RESTRICTED DEFINITIVE NOTES OR BENEFICIAL
INTERESTS IN A RESTRICTED GLOBAL NOTE FOR UNRESTRICTED DEFINITIVE NOTES OR
BENEFICIAL INTERESTS IN AN UNRESTRICTED GLOBAL NOTE.

                           (a) [ ] CHECK IF EXCHANGE IS FROM BENEFICIAL INTEREST
IN A RESTRICTED GLOBAL NOTE TO BENEFICIAL INTEREST IN AN UNRESTRICTED GLOBAL
NOTE. In connection with the Exchange of the Owner's beneficial interest in a
Restricted Global Note for a beneficial interest in an Unrestricted Global Note
in an equal principal amount, the Owner hereby certifies (i) the beneficial
interest is being acquired for the Owner's own account

                                       C-1

<PAGE>
without transfer, (ii) such Exchange has been effected in compliance with the
transfer restrictions applicable to the Restricted Global Notes and pursuant to
and in accordance with the United States Securities Act of 1933, as amended (the
"Securities Act"), (iii) the restrictions on transfer contained in the Indenture
and the Private Placement Legend are not required in order to maintain
compliance with the Securities Act and (iv) the beneficial interest in an
Unrestricted Global Note is being acquired in compliance with any applicable
blue sky securities laws of any State of the United States.

                           (b) [ ] CHECK IF EXCHANGE IS FROM BENEFICIAL INTEREST
IN A RESTRICTED GLOBAL NOTE TO UNRESTRICTED DEFINITIVE NOTE. In connection with
the Exchange of the Owner's beneficial interest in a Restricted Global Note for
an Unrestricted Definitive Note, the Owner hereby certifies (i) the Definitive
Note is being acquired for the Owner's own account without transfer, (ii) such
Exchange has been effected in compliance with the transfer restrictions
applicable to the Restricted Global Notes and pursuant to and in accordance with
the Securities Act, (iii) the restrictions on transfer contained in the
Indenture and the Private Placement Legend are not required in order to maintain
compliance with the Securities Act and (iv) the Unrestricted Definitive Note is
being acquired in compliance with any applicable blue sky securities laws of any
State of the United States.

                           (c) [ ] CHECK IF EXCHANGE IS FROM RESTRICTED
DEFINITIVE NOTE TO BENEFICIAL INTEREST IN AN UNRESTRICTED GLOBAL NOTE. In
connection with the Owner's Exchange of a Restricted Definitive Note for a
beneficial interest in an Unrestricted Global Note, the Owner hereby certifies
(i) the beneficial interest is being acquired for the Owner's own account
without transfer, (ii) such Exchange has been effected in compliance with the
transfer restrictions applicable to Restricted Definitive Notes and pursuant to
and in accordance with the Securities Act, (iii) the restrictions on transfer
contained in the Indenture and the Private Placement Legend are not required in
order to maintain compliance with the Securities Act and (iv) the beneficial
interest is being acquired in compliance with any applicable blue sky securities
laws of any State of the United States.

                           (d) [ ] CHECK IF EXCHANGE IS FROM RESTRICTED
DEFINITIVE NOTE TO UNRESTRICTED DEFINITIVE NOTE. In connection with the Owner's
Exchange of a Restricted Definitive Note for an Unrestricted Definitive Note,
the Owner hereby certifies (i) the Unrestricted Definitive Note is being
acquired for the Owner's own account without transfer, (ii) such Exchange has
been effected in compliance with the transfer restrictions applicable to
Restricted Definitive Notes and pursuant to and in accordance with the
Securities Act, (iii) the restrictions on transfer contained in the Indenture
and the Private Placement Legend are not required in order to maintain
compliance with the Securities Act and (iv) the Unrestricted

                                       C-2

<PAGE>

Definitive Note is being acquired in compliance with any applicable blue sky
securities laws of any State of the United States.

         2. EXCHANGE OF RESTRICTED DEFINITIVE NOTES OR BENEFICIAL INTERESTS IN
RESTRICTED GLOBAL NOTES FOR RESTRICTED DEFINITIVE NOTES OR BENEFICIAL INTERESTS
IN RESTRICTED GLOBAL NOTES.

                           (a) [ ] CHECK IF EXCHANGE IS FROM BENEFICIAL INTEREST
IN A RESTRICTED GLOBAL NOTE TO RESTRICTED DEFINITIVE NOTE. In connection with
the Exchange of the Owner's beneficial interest in a Restricted Global Note for
a Restricted Definitive Note with an equal principal amount, the Owner hereby
certifies that (i) the Restricted Definitive Note is being acquired for the
Owner's own account without transfer and (ii) such Exchange has been effected in
compliance with the transfer restrictions applicable to the Restricted Global
Notes and pursuant to and in accordance with the Securities Act, and in
compliance with any applicable blue sky securities laws of any State of the
United States. Upon consummation of the proposed Exchange in accordance with the
terms of the Indenture, the Restricted Definitive Note issued will continue to
be subject to the restrictions on transfer enumerated in the Private Placement
Legend printed on the Restricted Definitive Note and in the Indenture and the
Securities Act.

                           (b) [ ] CHECK IF EXCHANGE IS FROM RESTRICTED
DEFINITIVE NOTE TO BENEFICIAL INTEREST IN A RESTRICTED GLOBAL NOTE. In
connection with the Exchange of the Owner's Restricted Definitive Note for a
beneficial interest in the: [CHECK ONE] [ ] 144A Global Note, [ ] Reg S Global
Note, or [ ] Rule 501 Global Note with an equal principal amount, the Owner
hereby certifies (i) the beneficial interest is being acquired for the Owner's
own account without transfer and (ii) such Exchange has been effected in
compliance with the transfer restrictions applicable to the Restricted Global
Notes and pursuant to and in accordance with the Securities Act, and in
compliance with any applicable blue sky securities laws of any State of the
United States. Upon consummation of the proposed Exchange in accordance with the
terms of the Indenture, the beneficial interest issued will be subject to the
restrictions on transfer enumerated in the Private Placement Legend printed on
the relevant Restricted Global Note and in the Indenture and the Securities Act.

                                       C-3

<PAGE>

This certificate and the statements contained herein are made for your benefit
and the benefit of the Company.

--------------------------
[Insert Name of Owner]

By:
    ------------------------
    Name:
    Title:

Dated:
       -------------

                                       C-4

<PAGE>

                                    EXHIBIT D
                       FORM OF CERTIFICATE FROM ACQUIRING
                        INSTITUTIONAL ACCREDITED INVESTOR

Radiologix, Inc.
3600 Chase Tower
2200 Ross Avenue
Dallas, Texas 75201
Attention: Chief Financial Officer

U.S. Bank, N.A.
180 East Fifth Street
St. Paul, Minnesota 55101
Attention: Corporate Trust Department

         Re: 10.5% Senior Notes due 2008

Ladies and Gentlemen:

                  Reference is hereby made to the Indenture, dated as of
December 12, 2001 (the "Indenture"), between Radiologix, Inc., as issuer (the
"Company"), the Guarantors party thereto and U.S. Bank, N.A., as trustee.
Capitalized terms used but not defined herein shall have the meanings given to
them in the Indenture.

                  In connection with our proposed purchase of $____________
aggregate principal amount of: (a) a beneficial interest in a Global Note, or
(b) a Definitive Note, we confirm that:

                  1. We understand and acknowledge that the Notes have not been
registered under the Securities Act of 1933, as amended (the "Securities Act"),
or any other applicable securities law, and may not be offered, sold or
otherwise transferred except in compliance with the registration requirements of
the Securities Act or any other applicable securities law or pursuant to an
exemption therefrom and in each case in compliance with the conditions for
transfer set forth below.

                  2. We are an institutional "accredited investor" under the
Securities Act within the meaning of subparagraph (a)(1), (2), (3) or (7) of
Rule 501 under the Securities Act

                                       D-1

<PAGE>

("Rule 501") or, if the Notes are to be purchased for one or more accounts
("investor accounts") for which we are acting as fiduciary or agent, each such
investor account is an institutional "accredited investor" on a like basis. We
have such knowledge and experience in financial and business matters as to be
capable of evaluating the merits and risks of purchasing the Notes and invest in
or purchase securities similar to the Notes in the normal course of our
business. We and any accounts for which we are acting are each aware that we may
be required, and are each able, to bear the economic risk of our or its
investment in the Notes for an indefinite period of time.

                  3. We are purchasing the Notes for our own account, or for one
or more investor accounts for which we are acting as a fiduciary or agent, in
each case for investment, and not with a view to, or for offer or sale in
connection with, any distribution thereof in violation of the Securities Act,
subject to any requirement of law that the disposition of our property or the
property of such investor account or accounts be at all times within our or
their control and subject to our or their ability to resell such Notes pursuant
to Rule 144A under the Securities Act ("Rule 144A") or any exemption from
registration available under the Securities Act.

                  4. We agree on our own behalf and on behalf of any investor
account for which we are purchasing Notes to offer, sell or otherwise transfer
such Notes prior to the date which is two years (or such other period that may
hereafter be provided under Rule 144(k) under the Securities Act as permitting
resales of restricted securities by non-affiliates without restriction) after
the later of the date of original issue and the last date on which the Company
or any affiliate of the Company was the owner of such Notes (or any predecessor
thereof) (the "Resale Restriction Termination Date") only (a) to the Company,
(b) pursuant to a registration statement which has been declared effective under
the Securities Act, (c) for so long as the Notes are eligible for resale
pursuant to Rule 144A to a person we reasonably believe is a "qualified
institutional buyer" as defined in Rule 144A (a "QIB") that purchases for its
own account or for the account of a QIB and to whom notice is given that the
transfer is being made in reliance on Rule 144A, (d) outside the United States
in an offshore transaction in accordance with Rule 904 under the Securities Act,
(e) to an institutional "accredited investor" within the meaning of subparagraph
(a)(1), (2), (3) or (7) of Rule 501 that is purchasing the Notes for its own
account or for the account of such an institutional "accredited investor" for
investment purposes only, and not with a view to, or for offer or sale in
connection with, any distribution in violation of the Securities Act, or (f)
pursuant to any other available exemption from the registration requirements of
the Securities Act, subject in each of the foregoing cases to any requirement of
law that the disposition of our property or the property of such investor
account or accounts be at all times within our, its or their control and in each
case in

                                       D-2

<PAGE>

compliance with any applicable securities laws of any U.S. state or any other
applicable jurisdiction. The foregoing restrictions on resale will not apply
subsequent to the Resale Restriction Termination Date. If any resale or other
transfer of the Notes is proposed to be made pursuant to clause (e) above prior
to the Resale Restriction Termination Date, the transferor shall deliver a
letter from the transferee substantially in the form of this letter to the
Company and the Trustee, which shall provide, among other things, that the
transferee is an institutional "accredited investor" within the meaning of
subparagraph (a)(1), (2), (3) or (7) of Rule 501 and that it is acquiring such
Notes for investment purposes and not for distribution in violation of the
Securities Act. Each purchaser acknowledges that the Company and the Trustee
reserve the right prior to the offer, sale or other transfer made prior to the
Resale Termination Date to require the delivery of an opinion of counsel,
certifications and/or other information satisfactory to the Company and the
Trustee. We further understand that any subsequent transfer by us of the Notes
or beneficial interests in therein acquired by us must be effected through one
of the Initial Purchasers.

                  5. We understand that the Notes will be delivered in
registered form only and that the certificates delivered to us in respect of the
Notes will contain a legend substantially to the following effect:

         THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933,
         AS AMENDED (THE "SECURITIES ACT"), OR ANY STATE SECURITIES LAWS.
         NEITHER THIS SECURITY NOR ANY INTEREST OR PARTICIPATION HEREIN MAY BE
         REOFFERED, SOLD, ASSIGNED, TRANSFERRED, PLEDGED, ENCUMBERED OR
         OTHERWISE DISPOSED OF IN THE ABSENCE OF SUCH REGISTRATION OR UNLESS
         SUCH TRANSACTION IS EXEMPT FROM, OR NOT SUBJECT TO, REGISTRATION. THE
         HOLDER OF THIS SECURITY BY ITS ACCEPTANCE HEREOF AGREES TO OFFER, SELL
         OR OTHERWISE TRANSFER THIS SECURITY, PRIOR TO THE DATE WHICH IS TWO
         YEARS (OR SUCH OTHER PERIOD THAT MAY HEREAFTER BE PROVIDED UNDER RULE
         144(K) UNDER THE SECURITIES ACT AS PERMITTING RESALES OF RESTRICTED
         SECURITIES BY NON-AFFILIATES WITHOUT RESTRICTION) AFTER THE LATER OF
         THE ORIGINAL ISSUE DATE HEREOF AND THE LAST DATE ON WHICH THE COMPANY
         OR ANY AFFILIATE OF THE COMPANY WAS THE OWNER OF THIS SECURITY (OR ANY
         PREDECESSOR OF THIS SECURITY) (THE "RESALE RESTRICTION TERMINATION
         DATE") ONLY (A) TO THE COMPANY, (B) PURSUANT

                                       D-3

<PAGE>

         TO A REGISTRATION STATEMENT WHICH HAS BEEN DECLARED EFFECTIVE UNDER THE
         SECURITIES ACT, (C) FOR SO LONG AS THIS SECURITY IS ELIGIBLE FOR RESALE
         PURSUANT TO RULE 144A UNDER THE SECURITIES ACT, IN THE UNITED STATES TO
         A PERSON IT REASONABLY BELIEVES IS A "QUALIFIED INSTITUTIONAL BUYER"
         (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT) THAT PURCHASES FOR
         ITS OWN ACCOUNT OR FOR THE ACCOUNT OF A QUALIFIED INSTITUTIONAL BUYER
         TO WHOM NOTICE IS GIVEN THAT THE TRANSFER IS BEING MADE IN RELIANCE ON
         RULE 144A UNDER THE SECURITIES ACT, (D) TO AN INSTITUTIONAL "ACCREDITED
         INVESTOR" WITHIN THE MEANING OF SUBPARAGRAPH (a)(1), (2), (3) OR (7) OF
         RULE 501 UNDER THE SECURITIES ACT THAT IS ACQUIRING THIS SECURITY FOR
         ITS OWN ACCOUNT, OR FOR THE ACCOUNT OF SUCH AN INSTITUTIONAL
         "ACCREDITED INVESTOR," FOR INVESTMENT PURPOSES AND NOT WITH A VIEW TO,
         OR FOR OFFER OR SALE IN CONNECTION WITH, ANY DISTRIBUTION IN VIOLATION
         OF THE SECURITIES ACT, (E) OUTSIDE OF THE UNITED STATES IN AN OFFSHORE
         TRANSACTION IN ACCORDANCE WITH RULE 904 UNDER THE SECURITIES ACT OR (F)
         PURSUANT TO ANOTHER AVAILABLE EXEMPTION FROM THE REGISTRATION
         REQUIREMENTS OF THE SECURITIES ACT, SUBJECT TO THE COMPANY'S AND THE
         TRUSTEE'S RIGHT PRIOR TO ANY SUCH OFFER, SALE OR TRANSFER TO REQUIRE
         THE DELIVERY OF AN OPINION OF COUNSEL, CERTIFICATIONS AND/OR OTHER
         INFORMATION SATISFACTORY TO EACH OF THEM, AND IN EACH OF THE FOREGOING
         CASES, A CERTIFICATE OF TRANSFER IN THE FORM APPEARING ON THIS SECURITY
         IS COMPLETED AND DELIVERED BY THE TRANSFEROR TO THE TRUSTEE AND IN EACH
         CASE IN ACCORDANCE WITH APPLICABLE SECURITIES LAWS OF ANY U.S. STATE OR
         ANY OTHER APPLICABLE JURISDICTION. THE HOLDER OF THIS SECURITY AGREES
         THAT IT WILL DELIVER TO EACH PERSON TO WHOM THIS SECURITY IS
         TRANSFERRED A NOTICE SUBSTANTIALLY TO THE EFFECT OF THIS LEGEND. THIS
         LEGEND WILL BE REMOVED UPON THE REQUEST OF THE HOLDER AFTER THE RESALE
         RESTRICTION TERMINATION DATE.

                                       D-4

<PAGE>

                  6. If we are acquiring any of the Notes as a fiduciary or
agent for one or more investor accounts, we represent that we have sole
investment discretion with respect to each such account and we have full power
to make the foregoing acknowledgments, representations, warranties and
agreements on behalf of each such investor account.

                  You and the Company are entitled to rely upon this letter and
are irrevocably authorized to produce this letter or a copy hereof to any
interested party in any administrative or legal proceedings or official inquiry
with respect to the matters covered hereby.

                                               Dated:                   ,
------------------------------------                  ------------------  ----
[Insert Name of Accredited Investor]

By:
    ------------------------------
    Name:
    Title:

                                      D-5<PAGE>
                                                                     EXHIBIT 4.5

                                RADIOLOGIX, INC.

                    $160,000,000 10.5% SENIOR NOTES DUE 2008

                          REGISTRATION RIGHTS AGREEMENT

                                                               December 12, 2001

JEFFERIES & COMPANY, INC.
DEUTSCHE BANC ALEX. BROWN INC.
c/o Jefferies & Company, Inc.
11100 Santa Monica Boulevard
10th Floor
Los Angeles, California  90025

Ladies and Gentlemen:

                  Radiologix, Inc., a Delaware corporation (the "ISSUER"), is
issuing and selling to Jefferies & Company, Inc. and Deutsche Banc Alex. Brown
Inc. (the "INITIAL PURCHASERS"), upon the terms set forth in a purchase
agreement, dated as of December 7, 2001 (the "PURCHASE AGREEMENT"), $160,000,000
aggregate principal amount at maturity of the Issuer's 10.5% Senior Notes due
2008, Series A, including the Guarantees (as defined below) endorsed thereon
(the "NOTES"). As an inducement to the Initial Purchasers to enter into the
Purchase Agreement, the Issuer and each of the guarantors signatory to the
Purchase Agreement (the "GUARANTORS") jointly and severally agree with the
Initial Purchasers, for the benefit of the holders of the Securities (as defined
below) (including, without limitation, the Initial Purchasers), as follows:

1.       DEFINITIONS.

                  Capitalized terms used herein without definition shall have
the respective meanings set forth in the Purchase Agreement. As used in this
Agreement, the following terms shall have the following meanings:

                  ADVICE: See the last paragraph of Section 5.

                  AGREEMENT: This Registration Rights Agreement.

                  APPLICABLE PERIOD: See Section 2(f).

                                       1
<PAGE>

                  BUSINESS DAY: Any day, other than a Saturday, a Sunday or a
day on which banking institutions in The City of New York or at a place of
payment are authorized by law, regulation or executive order to remained closed.

                  CLOSING DATE: December 12, 2001.

                  CONTROLLING PERSON: See Section 7(a).

                  DTC: See Section 5(i).

                  EFFECTIVENESS DATE: The 180th day following the Closing Date.

                  EFFECTIVENESS PERIOD: See Section 3(a).

                  EVENT: See Section 4(a).

                  EVENT DATE: See Section 4(a).

                  EXCHANGE ACT: The Securities Exchange Act of 1934, as amended,
and the rules and regulations of the SEC promulgated thereunder.

                  EXCHANGE OFFER: See Section 2(a).

                  EXCHANGE OFFER REGISTRATION STATEMENT: See Section 2(a).

                  EXCHANGE SECURITIES: 10.5% Senior Notes due 2008, Series B, of
the Issuer, including the guarantees endorsed thereon, identical in all respects
to the Notes and the Guarantees, except for references to series and restrictive
legends.

                  FILING DATE: The 120th day following the Closing Date.

                  GUARANTEES: The full and unconditional guarantee, on a senior
basis by the Guarantors, as to payment of principal, interest, premium, if any,
and the Weekly Liquidated Damages Amount, if any, with respect to the Notes.

                  HOLDER: Each holder of Transfer Restricted Securities.

                  HOLDER INDEMNIFIED PARTIES: See Section 7(a).

                  INDEMNIFIED PARTY: See Section 7(c).

                  INDEMNIFYING PARTIES: See Section 7(c).

                                       2
<PAGE>

                  INDENTURE: The Indenture, dated as of the date hereof, by and
among the Issuer, the Guarantors and U.S. Bank, N.A., as trustee, pursuant to
which the Notes are being issued, as amended or supplemented from time to time,
in accordance with the terms thereof.

                  INITIAL SHELF REGISTRATION: See Section 3(a).

                  LOSSES: See Section 7(a).

                  MAXIMUM CONTRIBUTION AMOUNT: See Section 7(d).

                  NASD: The National Association of Securities Dealers, Inc.

                  PARTICIPATING BROKER-DEALER: See Section 2(f).

                  PERSON: An individual, trustee, corporation, limited liability
company, partnership, limited liability partnership, joint stock company, joint
venture, trust, unincorporated organization or association, government or any
agency or political subdivision thereof, union, business association, firm or
other entity.

                  PRIVATE EXCHANGE: See Section 2(g).

                  PRIVATE EXCHANGE SECURITIES: See Section 2(g).

                  PROSPECTUS: The prospectus included in a Registration
Statement at the time that such Registration Statement is declared effective
(including, without limitation, a prospectus that discloses information
previously omitted from a prospectus filed as part of an effective registration
statement in reliance upon Rule 430A under the Securities Act), as amended or
supplemented by any prospectus supplement with respect to the terms of the
offering of any portion of the Securities covered by such Registration
Statement, and all other amendments and supplements to such prospectus,
including post-effective amendments, and all material incorporated by reference
or deemed to be incorporated by reference in such prospectus.

                  REGISTRATION STATEMENT: Any registration statement of the
Issuer that covers any of the Securities and that is filed pursuant to the
provisions of this Agreement, including the Prospectus included therein, all
amendments and supplements to such registration statement and Prospectus
(including post-effective amendments), all exhibits thereto and all material
incorporated by reference or deemed to be incorporated by reference therein.

                                       3
<PAGE>

                  RULE 144: Rule 144 under the Securities Act, as such rule may
be amended from time to time, or any similar rule (other than Rule 144A) or
regulation hereafter adopted by the SEC.

                  RULE 144A: Rule 144A under the Securities Act, as such rule
may be amended from time to time, or any similar rule (other than Rule 144) or
regulation hereafter adopted by the SEC.

                  RULE 415: Rule 415 under the Securities Act, as such rule may
be amended from time to time, or any similar rule or regulation hereafter
adopted by the SEC.

                  SEC: The Securities and Exchange Commission.

                  SECURITIES: The Notes, the Private Exchange Securities and the
Exchange Securities, collectively.

                  SECURITIES ACT: The Securities Act of 1933, as amended, and
the rules and regulations of the SEC promulgated thereunder.

                  SHELF EFFECTIVENESS DATE: With respect to a Shelf
Registration, the 90th day after the filing of such Shelf Registration.

                  SHELF FILING DATE: With respect to a Shelf Registration, the
30th day following delivery of the Shelf Notice triggering the obligation to
file such Shelf Registration.

                  SHELF NOTICE: See Section 2(i).

                  SHELF REGISTRATION: The Initial Shelf Registration and any
Subsequent Shelf Registration.

                  SPECIAL COUNSEL: Counsel chosen by the holders of a majority
in aggregate principal amount of Securities.

                  SUBSEQUENT SHELF REGISTRATION: See Section 3(b).

                  TIA: The Trust Indenture Act of 1939, as amended.

                  TRANSFER RESTRICTED SECURITIES: Each Security until (i) the
date on which such Security has been exchanged by a person other than a
Participating Broker-Dealer for an Exchange Security in the Exchange Offer; (ii)
following receipt of an Exchange Security by a Participating Broker-Dealer in
the Exchange Offer, the

                                       4
<PAGE>
date on which such Exchange Security is sold to a purchaser who receives from
such Participating Broker-Dealer on or prior to the date of such sale a copy of
the Prospectus contained in the Exchange Offer Registration Statement, (iii) the
date on which such Security has been effectively registered under the Securities
Act and disposed of in accordance with the Shelf Registration or (iv) the date
on which such Security is distributed to the public pursuant to Rule 144 under
the Securities Act or may be distributed to the public pursuant to Rule 144(k)
under the Securities Act.

                  TRUSTEE: The trustee under the Indenture and, if any, the
trustee under any indenture governing the Exchange Securities or the Private
Exchange Securities.

                  UNDERWRITTEN REGISTRATION or UNDERWRITTEN OFFERING: A
registration in which securities of the Issuer are sold to an underwriter for
reoffering to the public.

                  WEEKLY LIQUIDATED DAMAGES AMOUNT: With respect to any Event,
an amount per week per $1,000 principal amount of Transfer Restricted Securities
equal to $0.05 for the first 90-day period immediately following the applicable
Event Date, increasing by an additional $0.05 per week per $1,000 principal
amount of Transfer Restricted Securities with respect to each subsequent 90-day
period, up to a maximum amount of $0.25 per week per $1,000 principal amount of
Transfer Restricted Securities.

2.       EXCHANGE OFFER.

         (a) The Issuer and the Guarantors shall:

                  (i) prepare and file with the SEC as soon as practicable after
the date hereof, but in no event later than the Filing Date, a registration
statement (the "EXCHANGE OFFER REGISTRATION STATEMENT") on an appropriate form
under the Securities Act with respect to a proposed offer (the "EXCHANGE OFFER")
to the Holders to issue and deliver to such Holders, in exchange for the Notes,
a like aggregate principal amount of Exchange Securities;

                  (ii) use their respective best efforts to cause the Exchange
Offer Registration Statement to become effective on or prior to the
Effectiveness Date;

                  (iii) use their respective best efforts to keep the Exchange
Offer Registration Statement effective until the consummation of the Exchange
Offer pursuant to its terms; and

                                       5
<PAGE>

                  (iv) unless the Exchange Offer would not be permitted by
applicable law or by a policy of the SEC, commence the Exchange Offer and use
their respective best efforts to, on or prior to the 30th Business Day after the
Exchange Offer Registration Statement is declared effective, consummate the
Exchange Offer and issue Exchange Securities in exchange for all Notes tendered
prior thereto in the Exchange Offer.

The Exchange Offer shall not be subject to any conditions, other than that the
Exchange Offer does not violate applicable law or any applicable interpretation
of the staff of the SEC.

         (b) The Exchange Securities shall be issued under, and entitled to the
benefits of, the Indenture or a trust indenture that is identical to the
Indenture (other than such changes as are necessary to comply with any
requirements of the SEC to effect or maintain the qualification thereof under
the TIA).

         (c) In connection with the Exchange Offer, the Issuer and the
Guarantors shall:

                  (i) mail to each Holder a copy of the Prospectus forming part
of the Exchange Offer Registration Statement, together with an appropriate
letter of transmittal that is an exhibit to the Exchange Offer Registration
Statement, and any related documents;

                  (ii) keep the Exchange Offer open for not less than 20
Business Days after the date notice thereof is mailed to the Holders (or longer
if required by applicable law);

                  (iii) utilize the services of a depositary for the Exchange
Offer with an address in the Borough of Manhattan, The City of New York;

                  (iv) permit Holders to withdraw tendered Notes at any time
prior to the close of business, New York time, on the last Business Day on which
the Exchange Offer shall remain open; and

                  (v) otherwise comply with all laws applicable to the Exchange
Offer.

         (d) As soon as practicable after the close of the Exchange Offer, the
Issuer and the Guarantors shall:

                  (i) accept for exchange all Notes validly tendered and not
properly withdrawn pursuant to the Exchange Offer;

                                       6
<PAGE>

                  (ii) deliver to the Trustee for cancellation all Notes so
accepted for exchange; and

                  (iii) cause the Trustee promptly to authenticate and deliver
to each Holder of Notes, Exchange Securities equal in aggregate principal amount
to the Notes of such Holder so accepted for exchange.

         (e) Interest on each Exchange Security and each Private Exchange
Security will accrue from the last interest payment date on which interest was
paid on the Notes surrendered in exchange therefor or, if no interest has been
paid on the Notes, from the date of original issue of the Notes. Each Exchange
Security and each Private Exchange Security shall bear interest at the rate set
forth thereon; provided, that interest with respect to the period prior to the
issuance thereof shall accrue at the rate or rates borne by the Notes
surrendered in exchange therefor from time to time during such period.

         (f) The Issuer and the Guarantors shall include within the Prospectus
contained in the Exchange Offer Registration Statement a section entitled "Plan
of Distribution," containing a summary statement of the positions taken or
policies made by the staff of the SEC with respect to the potential
"underwriter" status of any broker-dealer that is the beneficial owner (as
defined in Rule 13d-3 under the Exchange Act) of Exchange Securities received by
such broker-dealer in the Exchange Offer (a "PARTICIPATING BROKER-DEALER"). Such
"Plan of Distribution" section shall also allow the use of the Prospectus by all
Persons subject to the prospectus delivery requirements of the Securities Act,
including (without limitation) all Participating Brokers-Dealers, and include a
statement describing the means by which Participating Broker-Dealers may resell
the Exchange Securities. The Issuer and the Guarantors shall use their
respective best efforts to keep the Exchange Offer Registration Statement
continuously effective and to amend and supplement the Prospectus to be lawfully
delivered by all Persons subject to the prospectus delivery requirement of the
Securities Act for such period of time as any such Person must comply with such
prospectus delivery requirement in order to resell the Exchange Securities;
provided that such period shall not exceed 180 days after consummation of the
Exchange Offer (as such period may be extended pursuant to the last paragraph of
Section 5 hereof)(the "APPLICABLE PERIOD").

         (g) If, prior to consummation of the Exchange Offer, any Initial
Purchaser holds any Notes acquired by it and having the status as an unsold
allotment in the initial distribution of the Notes, the Issuer and the
Guarantors shall, upon the request of such Initial Purchaser, simultaneously
with the delivery of the

                                       7
<PAGE>

Exchange Securities in the Exchange Offer, issue (pursuant to the same indenture
as the Exchange Securities and subject to transfer restrictions thereon) and
deliver to such Initial Purchaser, in exchange for the Notes held by such
Initial Purchaser (the "PRIVATE EXCHANGE"), a like principal amount of debt
securities of the Issuer, including guarantees endorsed thereon, that are
identical to the Exchange Securities (the "PRIVATE EXCHANGE SECURITIES"). The
Private Exchange Securities shall bear the same CUSIP number as the Exchange
Securities.

         (h) The Issuer may require each Holder participating in the Exchange
Offer to represent to the Issuer and the Guarantors that, at the time of the
consummation of the Exchange Offer: (i) any Exchange Securities received by such
Holder in the Exchange Offer will be acquired in the ordinary course of its
business; (ii) such Holder will have no arrangement or understanding with any
Person to participate in the distribution of the Exchange Securities within the
meaning of the Securities Act or the resale of the Exchange Securities in
violation of the Securities Act; (iii) if such Holder is not a broker-dealer,
that it is not engaged in and does not intend to engage in, the distribution of
the Exchange Securities; (iv) if such Holder is a broker-dealer that will
receive Exchange Securities for its own account in exchange for Notes that were
acquired as a result of market-making or other trading activities, that it will
deliver a prospectus, as required by law, in connection with any resale of such
Exchange Securities; and (v) if such Holder is an affiliate of the Issuer, that
it will comply with the registration and prospectus delivery requirements of the
Securities Act applicable to it.

         (i) If: (i) the Issuer and the Guarantors are not required to file an
Exchange Offer Registration Statement or permitted to consummate the Exchange
Offer because the Exchange Offer is not permitted by applicable law or SEC
policy (after compliance with the procedures set forth in Section 5 below); (ii)
subsequent to the consummation of the Private Exchange, any Holder of Private
Exchange Securities so requests; (iv) the Exchange Offer is not consummated for
any reason within 30 Business Days of the Effectiveness Date; or (v) in the case
of (A) any Holder prohibited by applicable law or SEC policy from participating
in the Exchange Offer, (B) any Holder participating in the Exchange Offer that
receives Exchange Securities that may not be sold by such Holder to the public
without delivering a prospectus and the Prospectus contained in the Exchange
Offer Registration Statement is not available for such resales, or (C) any
broker-dealer that holds Notes acquired directly from the Issuer or any of its
affiliates and, in each such case contemplated by this clause (v), such Holder
notifies the Issuer within 20 Business Days of consummation of the Exchange
Offer, then the Issuer shall, within five Business Days thereof, deliver to the
Holders and the Trustee notice thereof (the "SHELF NOTICE") and shall as soon as
possible thereafter (and in any event on or prior to the Shelf Filing Date) file
an Initial Shelf Registration pursuant to Section 3.

                                       8
<PAGE>

3.       SHELF REGISTRATION.

                  If at any time a Shelf Notice is required to be delivered
pursuant to Section 2(i), then:

         (a) Initial Shelf Registration. The Issuer and the Guarantors shall
prepare and file with the SEC a Registration Statement for an offering to be
made on a continuous basis pursuant to Rule 415 covering all of the Transfer
Restricted Securities (the "INITIAL SHELF REGISTRATION") subject to the Issuer's
right pursuant to Section 3(c) to exclude the Transfer Restricted Securities of
Holders that have not provided the information required to be furnished by such
Holders pursuant to Section 3(c) hereof. The Issuer and the Guarantors shall
file with the SEC the Initial Shelf Registration as soon as possible following
the occurrence of the event described in Section 2(i) that triggered such filing
obligation, but in no event later than the Shelf Filing Date. The Initial Shelf
Registration shall be on Form S-1 or another appropriate form permitting
registration of such Transfer Restricted Securities for resale by such Holders
in the manner or manners designated by them (including, without limitation, one
or more underwritten offerings). The Issuer and the Guarantors (i) shall not
permit any securities other than the Transfer Restricted Securities to be
included in any Shelf Registration, and (ii) shall use their respective best
efforts to cause the Initial Shelf Registration to be declared effective under
the Securities Act on or prior to the Shelf Effectiveness Date) and to keep the
Initial Shelf Registration continuously effective under the Securities Act until
the date that is 24 months after the Closing Date (subject to extension pursuant
to the last paragraph of Section 5 hereof) (the "EFFECTIVENESS PERIOD"), or such
shorter period ending when (i) all Transfer Restricted Securities covered by the
Initial Shelf Registration have been sold in the manner set forth and as
contemplated in the Initial Shelf Registration, (ii) a Subsequent Shelf
Registration covering all of the Transfer Restricted Securities covered by and
not sold under the Initial Shelf Registration or an earlier Subsequent Shelf
Registration has been declared effective under the Securities Act; provided,
however, that the Effectiveness Period in respect of the Initial Shelf
Registration shall be extended to the extent required to permit dealers to
comply with the applicable prospectus delivery requirements of Rule 174 under
the Securities Act and as otherwise provided herein and shall be subject to
reduction to the extent that the applicable provisions of Rule 144 are amended
or revised, (iii) such Transfer Restricted Securities are eligible for resale
pursuant to Rule 144(k) under the Securities Act or (iv) there cease to be any
outstanding Transfer Restricted Securities.

                                       9
<PAGE>

         (b) Subsequent Shelf Registrations. If any Shelf Registration ceases to
be effective for any reason at any time during the Effectiveness Period (other
than because of the sale of all of the Transfer Restricted Securities registered
thereunder), the Issuer and the Guarantors shall use their respective best
efforts to obtain the prompt withdrawal of any order suspending the
effectiveness thereof, and in any event shall within 30 days of such cessation
of effectiveness file an amendment to the Shelf Registration in a manner
reasonably expected to obtain the withdrawal of the order suspending the
effectiveness thereof, or file an additional "shelf" Registration Statement
pursuant to Rule 415 covering all of the Transfer Restricted Securities (a
"SUBSEQUENT SHELF REGISTRATION"). If a Subsequent Shelf Registration is filed,
the Issuer and the Guarantors shall use their respective best efforts to cause
the Subsequent Shelf Registration to be declared effective as soon as
practicable after such filing and to keep such Subsequent Shelf Registration
continuously effective for a period equal to the number of days in the
Effectiveness Period less the aggregate number of days during which the Initial
Shelf Registration, and any previously filed Subsequent Shelf Registration, were
previously effective.

         (c) Provision of Information. The Issuer and the Guarantors may exclude
from any Shelf Registration the Transfer Restricted Securities of any Holder
who, without reasonable basis, fails to furnish to the Issuer in writing, within
20 days after receipt of a written request therefor, the information specified
in Item 507 or 508, as applicable, of Regulation S-K under the Securities Act
for use in connection with any Shelf Registration or Prospectus or preliminary
Prospectus included therein. No such Holder shall be entitled to liquidated
damages pursuant to Section 4 unless and until such Holder shall have provided
all such information. Each Holder whose Transfer Restricted Securities are to be
included in a Shelf Registration Statement agrees to furnish to the Issuer all
additional information required to be disclosed in order to make the information
previously furnished to the Issuer by such Holder not materially misleading.

4.       LIQUIDATED DAMAGES.

         (a) The Issuer and the Guarantors acknowledge and agree that the
Holders will suffer damages, and that it would not be feasible to ascertain the
extent of such damages with precision, if the Issuer and the Guarantors fail to
fulfill their respective obligations hereunder. Accordingly, in the event of
such failure, the Issuer and the Guarantors jointly and severally agree to pay
liquidated damages to each Holder under the circumstances and to the extent set
forth below:

                  (i) if the Exchange Offer Registration Statement has not been
filed with the SEC on or prior to the Filing Date;

                  (ii) if the Exchange Offer Registration Statement is not
declared effective by the SEC on or prior to the Effectiveness Date; or

                                       10
<PAGE>

                  (iii) if the Exchange Offer is not consummated on or before
the 30th Business Day after the date on which the Exchange Offer Registration
Statement is declared effective by the SEC;

                  (iv) if an Exchange Offer Registration Statement is filed and
declared effective by the SEC but thereafter ceases to be effective during the
Applicable Period;

                  (v) if obligated to file a Shelf Registration and the Issuer
and the Guarantors fail to file such Shelf Registration with the SEC on or prior
to the Shelf Filing Date;

                  (vi) if a Shelf Registration is filed and such Shelf
Registration is not declared effective on or prior to the Shelf Effectiveness
Date; or

                  (vii) if a Shelf Registration is filed and declared effective
by the SEC but thereafter ceases to be effective during the Effectiveness
Period;

(each of the foregoing an "EVENT," and the date on which the Event occurs being
referred to herein as an "EVENT DATE").

                  Upon the occurrence of any Event, the Issuer shall pay, or
cause to be paid (and the Guarantors hereby guarantee the payment of), in
addition to amounts otherwise due under the Indenture and the Transfer
Restricted Securities, as liquidated damages, and not as a penalty, to each
Holder for each weekly period beginning on the Event Date an amount equal to the
Weekly Liquidated Damages Amount per $1,000 principal amount of Transfer
Restricted Securities held by such Holder; provided, that such liquidated
damages will, in each case, cease to accrue (subject to the occurrence of
another Event) on the date on which all Events have been cured. The Issuer and
the Guarantors shall not be required to pay liquidated damages for more than one
Event at any given time. An Event under clause (i) above shall be cured on the
date that the Exchange Offer Registration Statement (or, if an Initial Shelf
Registration is required to be filed pursuant to clause (i) or (ii) of Section
2(i), the date that such Initial Shelf Registration) is filed with the SEC; an
Event under clause (ii) above shall be cured on the date that the Exchange Offer
Registration Statement (or, if an Initial Shelf Registration is required to be
filed pursuant to clause (i) or (ii) of Section 2(i), the date that such Initial
Shelf Registration) is declared effective by the SEC; an Event under clause
(iii) above shall be cured on the earlier of the date (A) the Exchange Offer is
consummated with respect to all Notes validly tendered or (B) the Issuer
delivers a Shelf Notice to the

                                       11
<PAGE>

Holders and the Trustee pursuant to clause (i) or (ii) of Section 2(i); an Event
under clause (iv) above shall be cured on the date on which the Exchange Offer
Registration Statement is no longer subject to an order suspending the
effectiveness thereof or proceedings relating thereto; an Event under clause (v)
above shall be cured on the date that such Shelf Registration is filed with the
SEC; an Event under clause (vi) above shall be cured on the date that such Shelf
Registration is declared effective by the SEC; and an Event under clause (vii)
above shall be cured on the earlier of (A) the date on which the applicable
Shelf Registration is no longer subject to an order suspending the effectiveness
thereof or proceedings relating thereto or (B) a new Subsequent Shelf
Registration is declared effective.

         (b) The Issuer shall notify the Trustee of the occurrence of an Event
within five Business Days after each Event Date. The Issuer shall pay the
liquidated damages due on the Transfer Restricted Securities by depositing with
the Trustee, in trust, for the benefit of the Holders thereof, by 12:00 noon,
New York City time, on or before the applicable semi-annual interest payment
date for the Transfer Restricted Securities, immediately available funds in sums
sufficient to pay the liquidated damages then due. The liquidated damages amount
due shall be payable in the same manner as interest payments on the Notes on
each interest payment date to the record Holder entitled to receive the interest
payment to be made on such date as set forth in the Indenture.

5.       REGISTRATION PROCEDURES.

                  In connection with the registration of any Securities pursuant
to Sections 2 or 3 hereof, the Issuer and the Guarantors shall effect such
registrations to permit the sale of such Securities in accordance with the
intended method or methods of disposition thereof, and pursuant thereto the
Issuer and the Guarantors shall:

         (a) Prepare and file with the SEC, as soon as practicable after the
date hereof but in any event on or prior to the Filing Date, with respect to an
Exchange Offer Registration Statement, and on or prior to the Shelf Filing Date,
with respect to a Shelf Registration, as prescribed by Sections 2 and 3,
respectively, and use their respective best efforts to cause each such
Registration Statement to become effective and remain continuously effective for
the Applicable Period or Effectiveness Period, as applicable, as provided in
this Agreement; provided, that if (i) such filing is pursuant to Section 3 or
(ii) a Prospectus contained in an Exchange Offer Registration Statement filed
pursuant to Section 2 is required to be delivered under the Securities Act by
any Participating Broker-Dealer who seeks to sell Exchange Securities during the
Applicable Period, before filing any Registration Statement or Prospectus or any
amendments or supplements thereto, (A) the Issuer shall notify the Holders of
the Transfer Restricted Securities covered by such Registration

                                       12
<PAGE>

Statement, their Special Counsel, each Participating Broker-Dealer, the managing
underwriters, if any, and their counsel of such filing at least five Business
Days prior to making such filing, (B) if requested, the Issuer and the
Guarantors shall furnish to and afford the Holders of the Transfer Restricted
Securities covered by such Registration Statement, their Special Counsel, each
Participating Broker-Dealer, the managing underwriters, if any, and their
counsel a reasonable opportunity to review, and shall make available for
inspection by such Persons, copies of all such documents (including copies of
any documents to be incorporated by reference therein and all exhibits thereto)
proposed to be filed and such financial and other information and books and
records of the Issuer and the Guarantors, as shall be necessary, in the opinion
of Special Counsel and the respective counsels to such Participating
Broker-Dealers and underwriters, to conduct a reasonable due diligence
investigation within the meaning of the Securities Act, and (C) the Issuer and
the Guarantors shall cause the members, managers, officers, directors and
employees of the Issuer and the Guarantors, and counsel and independent
certified public accountants of the Issuer and the Guarantors, to respond to
such inquiries, as shall be necessary, in the opinion of Special Counsel and the
respective counsels to such Participating Broker-Dealers and underwriters, to
conduct a reasonable due diligence investigation within the meaning of the
Securities Act. The Issuer and the Guarantors may require each Holder to enter
into a customary confidentiality agreement prepared by the Issuer and the
Guarantors and reasonably acceptable in form and substance to such Holders, that
requires such Holders to keep confidential any non-public information relating
to the Issuer and the Guarantors received by such Holder, to refrain from using
such information as the basis for any market transactions in the securities of
the Issuer and not to disclose such information (other than to an affiliate or
prospective purchaser who agrees in writing to respect the confidentiality
provisions of this Section 5(a)) until such information has been made generally
available to the public unless the release of such information is required by
law or necessary to respond to inquiries of regulatory authorities. The Issuer
and the Guarantors shall not file any Registration Statement or Prospectus or
any amendments or supplements thereto that the Holders must be afforded an
opportunity to review prior to the filing of such document, if the Holders of a
majority in aggregate principal amount of the Transfer Restricted Securities
covered by such Registration Statement, their Special Counsel, any Participating
Broker-Dealer or the managing underwriters, if any, or their counsel shall
reasonably object to such filing within five Business Days after receipt of the
Issuer's notice of filing described above in this Section 5(a). A Holder shall
be deemed to have reasonably objected to such filing if such Registration
Statement, amendment, Prospectus or supplement, as applicable, as proposed to be
filed, contains an untrue statement of a material fact or omits to state any
material fact necessary to make the statements therein not misleading or fails
to comply with the applicable requirements of the Securities Act.

                                       13
<PAGE>

         (b) Provide an indenture trustee for the Transfer Restricted Securities
or the Exchange Securities, as the case may be, and cause the Indenture (or
other indenture relating to the Transfer Restricted Securities) to be qualified
under the TIA not later than the effective date of the first Registration
Statement; in connection therewith, effect such changes to such indenture as may
be required for such indenture to be so qualified in accordance with the terms
of the TIA; and execute, and use their respective best efforts to cause such
trustee to execute, all documents as may be required to effect such changes, and
all other forms and documents required to be filed with the SEC to enable such
indenture to be so qualified in a timely manner.

         (c) Prepare and file with the SEC such pre-effective amendments and
post-effective amendments to the Registration Statement as may be necessary in
order to cause the Registration Statement to become effective and to keep such
Registration Statement continuously effective for the time periods required
hereby; cause the related Prospectus to be supplemented by any Prospectus
supplement required by applicable law, and as so supplemented to be filed
pursuant to Rule 424 (or any similar provisions then in force) under the
Securities Act, and comply in all material respects with Rules 424, 430A and
462, as applicable, under the Securities Act; and comply in all material
respects with the provisions of the Securities Act and the Exchange Act
applicable thereto with respect to the disposition of all securities covered by
such Registration Statement, as so amended, or in such Prospectus, as so
supplemented, in accordance with the intended methods of distribution set forth
in such Registration Statement, as so amended, and such Prospectus, as so
supplemented.

         (d) Furnish to such selling Holders and Participating Broker-Dealers
who so request (i) upon the Issuer's and the Guarantors' receipt, a copy of the
order of the SEC declaring such Registration Statement and any post-effective
amendment thereto effective, (ii) such reasonable number of copies of such
Registration Statement and of each amendment and supplement thereto (in each
case including any documents incorporated therein by reference and all exhibits
(including exhibits incorporated by reference) to such Registration Statement
and each such amendment and supplement), (iii) such reasonable number of copies
of the Prospectus included in such Registration Statement (including each
preliminary prospectus and each supplement thereto), and such reasonable number
of copies of the final Prospectus as filed by the Issuer and the Guarantors
pursuant to Rule 424(b) under the Securities Act, in conformity in all material
respects with the applicable requirements of the Securities Act, and (iv) such
other documents (including any amendments and supplements required to be filed
pursuant to Section 5(c) and any documents incorporated therein by reference and
all exhibits thereto, including exhibits

                                       14
<PAGE>

incorporated by reference), as any such Person may reasonably request. The
Issuer and the Guarantors hereby consent to the use (in accordance with
applicable law) of the Prospectus by each of the selling Holders of Transfer
Restricted Securities and by each such Participating Broker-Dealer, as the case
may be, and the underwriters or agents, if any, and dealers (if any), in
connection with the offering and sale of the Transfer Restricted Securities
covered by, or the sale by Participating Broker-Dealers of the Exchange
Securities pursuant to, such Prospectus and any amendment or supplement thereto.

         (e) If (A) a Shelf Registration is filed pursuant to Section 3 or (B) a
Prospectus contained in an Exchange Offer Registration Statement filed pursuant
to Section 2 is required to be delivered under the Securities Act by any
Participating Broker-Dealer who seeks to sell Exchange Securities during the
Applicable Period, notify the selling Holders of Transfer Restricted Securities,
their Special Counsel, each Participating Broker-Dealer and the managing
underwriters, if any, as soon as practicable (but in any event within five
Business Days), and, if requested by such Person, confirm such notice in
writing, (i) when a Prospectus or any Prospectus supplement or Registration
Statement or post-effective amendment has been filed, and, with respect to a
Registration Statement or any post-effective amendment, when the same has become
effective under the Securities Act, (ii) of the issuance by the SEC of any stop
order suspending the effectiveness of a Registration Statement or of any order
preventing or suspending the use of any Prospectus or the initiation of any
proceedings for that purpose, (iii) if, at any time when a Prospectus is
required by the Securities Act to be delivered in connection with sales of the
Transfer Restricted Securities, the representations and warranties of the Issuer
and the Guarantors contained in any agreement (including any underwriting
agreement) contemplated by Section 5(n) below cease to be true and correct in
any material respect, (iv) of the receipt by the Issuer or any of the Guarantors
of any notification with respect to the suspension of the qualification or
exemption from qualification of a Registration Statement or any of the Transfer
Restricted Securities or the Exchange Securities to be sold by any Participating
Broker-Dealer for offer or sale in any jurisdiction, or the contemplation,
initiation or threatening of any proceeding for such purpose, (v) of the
happening of any event that makes any statement made in such Registration
Statement or related Prospectus or any document incorporated or deemed to be
incorporated therein by reference to be untrue in any material respect or that
requires the making of any additions to or changes in such Registration
Statement, Prospectus or documents so that it will not contain any untrue
statement of a material fact or omit to state any material fact required to be
stated therein or necessary to make the statements therein, in light of the
circumstances under which such statements were made, not misleading, (vi) of the
Issuer's and the Guarantors' reasonable determination that a post-effective
amendment to a Registration Statement would be

                                       15
<PAGE>

appropriate, and (vii) of any request by the SEC for amendments to the
Registration Statement or supplements to the Prospectus or for additional
information relating thereto.

         (f) Use their respective best efforts to register or qualify, and, if
applicable, to cooperate with the selling Holders of Transfer Restricted
Securities, the underwriters, if any, and their respective counsel in connection
with the registration or qualification (or exemption from such registration or
qualification) of, Transfer Restricted Securities to be included in a
Registration Statement for offer and sale under the securities or Blue Sky laws
of such jurisdictions within the United States as any selling Holder,
Participating Broker-Dealer or the managing underwriters, if any, reasonably
request in writing; and, if Securities are offered other than through an
Underwritten Offering, the Issuer and the Guarantors shall cause their
respective counsel to perform Blue Sky investigations and file registrations and
qualifications required to be filed pursuant to this Section 5(f) at the expense
of the Issuer and the Guarantors; keep each such registration or qualification
(or exemption therefrom) effective during the period such Registration Statement
is required to be kept effective and do any and all other acts or things
necessary or advisable to enable the disposition in such jurisdictions of the
Securities covered by the applicable Registration Statement; provided, however,
that neither the Issuer nor any Guarantor shall be required to (i) register or
qualify generally to do business in any jurisdiction where it is not then so
qualified, (ii) take any action that would subject it to general service of
process in any jurisdiction where it is not then so subject or (iii) take any
action that would subject it to general taxation in respect of doing business in
any such jurisdiction where it is not then so subject.

         (g) Use their respective commercially reasonable efforts to prevent the
issuance of any order suspending the effectiveness of a Registration Statement
or preventing or suspending the use of a Prospectus or suspending the
qualification (or exemption from qualification) of any of the Securities for
sale in any jurisdiction, and, if any such order is issued, use their respective
best efforts to obtain the withdrawal or lifting of any such order at the
earliest possible time.

         (h) If (i) a Shelf Registration is filed pursuant to Section 3 or (ii)
a Prospectus contained in an Exchange Offer Registration Statement filed
pursuant to Section 2 is required to be delivered under the Securities Act by
any Participating Broker-Dealer who seeks to sell Exchange Securities during the
Applicable Period, and if requested by the managing underwriters, if any, such
Participating Broker-Dealer or the Holders of a majority in aggregate principal
amount of the Transfer Restricted Securities, (A) promptly incorporate in a
Prospectus supplement or post-effective amendment such information as the
managing underwriters, if any, or such

                                       16
<PAGE>

Holders reasonably request to be included therein as required to comply with any
applicable law and (B) make all required filings of such Prospectus supplement
or such post-effective amendment as soon as practicable after the Issuer and the
Guarantors have received notification of such matters required by applicable law
to be incorporated in such Prospectus supplement or post-effective amendment.

         (i) If (i) a Shelf Registration is filed pursuant to Section 3 or (ii)
a Prospectus contained in an Exchange Offer Registration Statement filed
pursuant to Section 2 is required to be delivered under the Securities Act by
any Participating Broker-Dealer who seeks to sell Exchange Securities during the
Applicable Period, cooperate with the selling Holders, such Participating
Broker-Dealer and the managing underwriters, if any, to facilitate the
preparation and delivery of certificates representing Transfer Restricted
Securities to be sold, which certificates shall not bear any restrictive legends
and shall be in a form eligible for deposit with The Depository Trust Company
("DTC"); and enable such Transfer Restricted Securities to be in such
denominations and registered in such names as the managing underwriters, if any,
such Participating Broker-Dealer or the Holders may request.

         (j) If (i) a Shelf Registration is filed pursuant to Section 3 or (ii)
a Prospectus contained in an Exchange Offer Registration Statement filed
pursuant to Section 2 is required to be delivered under the Securities Act by
any Participating Broker-Dealer who seeks to sell Exchange Securities during the
Applicable Period, upon the occurrence of any event contemplated by Section
5(e)(v), 5(e)(vi) or 5(e)(vii), soon as practicable prepare a post-effective
amendment to the Registration Statement, a supplement to the related Prospectus
or a supplement or amendment to any such document incorporated or deemed to be
incorporated therein by reference, or file any other required document so that,
as thereafter delivered to the purchasers of the Transfer Restricted Securities
being sold thereunder or to the purchasers of the Exchange Securities to whom
such Prospectus will be delivered by a Participating Broker-Dealer, such
Prospectus will not contain an untrue statement of a material fact or omit to
state a material fact required to be stated therein or necessary to make the
statements therein, in light of the circumstances under which they were made,
not misleading, and, if SEC review is required, use their respective best
efforts to cause such post-effective amendment to be declared effective as soon
as practicable.

         (k) Use their respective best efforts to cause the Securities covered
by a Registration Statement to be rated with the appropriate rating agencies, if
appropriate, and if so requested by the holders of a majority in aggregate
principal amount of Securities covered by such Registration Statement or the
managing underwriters, if any.

                                       17
<PAGE>

         (l) Prior to the effective date of the first Registration Statement
relating to the Securities, (i) provide the applicable trustee with printed
certificates for the Securities in a form eligible for deposit with DTC and (ii)
provide a CUSIP number for each of the Securities.

         (m) Use their respective best efforts to cause all Securities covered
by such Registration Statement to be listed on each securities exchange, if any,
on which similar debt securities issued by the Issuer are then listed.

         (n) If a Shelf Registration is filed pursuant to Section 3, enter into
such customary agreements (including, if requested, an underwriting agreement in
form, scope and substance as is customary in Underwritten Offerings) and take
all such other actions in connection therewith (including those reasonably
requested by the managing underwriters, if any, or the Holders of a majority in
aggregate principal amount of Transfer Restricted Securities being sold) in
order to expedite or facilitate the registration or the disposition of such
Transfer Restricted Securities, and in such connection, whether or not an
underwriting agreement is entered into and whether or not the registration is an
Underwritten Registration, (i) make such representations and warranties to the
Holders and the underwriters, if any, with respect to the business of the Issuer
and its respective subsidiaries, and the Registration Statement, Prospectus and
documents, if any, incorporated or deemed to be incorporated by reference
therein, in each case, in form, substance and scope as are customarily made by
issuers to underwriters in Underwritten Offerings, and confirm the same if and
when reasonably requested; (ii) obtain opinions of counsel to the Issuer and the
Guarantors and updates thereof (which counsel and opinions (in form, scope and
substance) shall be reasonably satisfactory to the managing underwriters, if
any, and the Holders of a majority in aggregate principal amount of the Transfer
Restricted Securities being sold), addressed to each selling Holder and each of
the underwriters, if any, covering the matters customarily covered in opinions
requested in Underwritten Offerings; (iii) obtain "cold comfort" letters and
updates thereof (which letters and updates (in form, scope and substance) shall
be reasonably satisfactory to the managing underwriters, if any, and the Holders
of a majority in aggregate principal amount of the Transfer Restricted
Securities being sold) from the independent certified public accountants of the
Issuer and the Guarantors (and, if necessary, any other independent certified
public accountants of any subsidiary of the Issuer or of any business acquired
by the Issuer for which financial statements and financial data are, or are
required to be, included in the Registration Statement), addressed to each of
the underwriters, if any, and each selling Holder, such letters to be in
customary form and covering matters of the type customarily covered in "cold
comfort" letters in connection with Underwritten Offerings and such other
matters as reasonably requested by underwriters, if any, or the Holders of a
majority in aggregate principal amount of the Transfer Restricted Securities
being sold; and (iv)

                                       18
<PAGE>

deliver such documents and certificates as may be reasonably requested by the
Holders of a majority in principal amount of the Transfer Restricted Securities
being sold and the managing underwriters, if any, to evidence the continued
validity of the representations and warranties of the Issuer and the Guarantors
and their respective subsidiaries made pursuant to clause (i) above and to
evidence compliance with any conditions contained in the underwriting agreement
or other similar agreement entered into by the Issuer and the Guarantors.

         (o) Comply with all applicable rules and regulations of the SEC and
make generally available to their respective security holders earnings
statements satisfying the provisions of Section 11(a) of the Securities Act and
Rule 158 thereunder (or any similar rule promulgated under the Securities Act)
no later than 45 days after the end of any 12-month period (or 90 days after the
end of any 12-month period if such period is a fiscal year) (i) commencing on
the first day of the fiscal quarter following each fiscal quarter in which
Transfer Restricted Securities are sold to underwriters in a firm commitment or
best efforts Underwritten Offering and (ii) if not sold to underwriters in such
an offering, commencing on the first day of the first fiscal quarter of the
Issuer after the effective date of a Registration Statement, which statements
shall cover said 12-month periods.

         (p) Upon consummation of an Exchange Offer or Private Exchange, obtain
an opinion of counsel to the Issuer and the Guarantors (in form, scope and
substance reasonably satisfactory to the Initial Purchasers), addressed to all
Holders participating in the Exchange Offer or Private Exchange, as the case may
be, to the effect that (i) the Issuer and the Guarantors have duly authorized,
executed and delivered the Exchange Securities or the Private Exchange
Securities, as the case may be, and the Indenture and (ii) the Exchange
Securities or the Private Exchange Securities, as the case may be, and the
Indenture constitute legal, valid and binding obligations of the Issuer and the
Guarantors, enforceable against the Issuer and the Guarantors in accordance with
their respective terms, except as such enforcement may be limited by (A)
applicable bankruptcy, insolvency, reorganization, moratorium and similar laws
now or hereafter in effect relating to or affecting creditors' rights generally
and (B) general principles of equity (regardless of whether enforceability is
considered in a proceeding in equity or at law).

         (q) If an Exchange Offer or Private Exchange is to be consummated, upon
delivery of the Transfer Restricted Securities by such Holders to the Issuer and
the Guarantors (or to such other Person as directed by the Issuer and the
Guarantors) in exchange for the Exchange Securities or the Private Exchange
Securities, as the case may be, the Issuer and the Guarantors shall mark, or
caused to be marked, on such Transfer Restricted Securities that such Transfer
Restricted Securities are being

                                       19
<PAGE>

cancelled in exchange for the Exchange Securities or the Private Exchange
Securities, as the case may be, and in no event shall such Transfer Restricted
Securities be marked as paid or otherwise satisfied.

         (r) Cooperate with each seller of Transfer Restricted Securities
covered by any Registration Statement and each underwriter, if any,
participating in the disposition of such Transfer Restricted Securities and
their respective counsel in connection with any filings required to be made with
the NASD.

         (s) Use their respective commercially reasonable efforts to take all
other steps necessary to effect the registration of the Transfer Restricted
Securities covered by a Registration Statement contemplated hereby.

                  Each Holder and each Participating Broker-Dealer agrees by
acquisition of such Transfer Restricted Securities or Exchange Securities that,
upon receipt of written notice from the Issuer and the Guarantors of the
happening of any event of the kind described in Section 5(e)(ii), 5(e)(iv),
5(e)(v), 5(e)(vi) or 5(e)(vii), such Holder will forthwith discontinue
disposition (in the jurisdictions specified in a notice of a 5(e)(iv) event, and
elsewhere in a notice of a 5(e)(ii), 5(e)(v), 5(e)(vi) or 5(e)(vii) event) of
such Securities covered by such Registration Statement or Prospectus until the
earlier of (i) such Holder's receipt of the copies of the supplemented
Prospectus contemplated by Section 5(j); or (ii) the time such Holder is advised
in writing (the "ADVICE") by the Issuer and the Guarantors that offers or sales
in a particular jurisdiction may be resumed, or that the use of the applicable
Prospectus may be resumed, as the case may be, and has received copies of any
amendments or supplements thereto. If so directed by the Issuer in such notice,
each Holder and each Participating Broker-Dealer will deliver to the Issuer (at
the Issuer's expense) all copies of the Prospectus covering such Securities that
was current at the time of such Holder's or Participating Broker-Dealer's
receipt of such notice. If the Issuer and the Guarantors shall give such notice,
each of the Effectiveness Period and the Applicable Period shall be extended by
the number of days during such periods from and including the date of the giving
of such notice to and including the date when each seller of such Securities
covered by such Registration Statement shall have received (x) the copies of the
amended or supplemented Prospectus contemplated by Section 5(j) or (y) the
Advice.

6.       REGISTRATION EXPENSES.

         (a) All fees and expenses incident to the performance of or compliance
with this Agreement by the Issuer and the Guarantors shall be borne by the
Issuer and the Guarantors whether or not the Exchange Offer is consummated or
the Exchange Offer Registration Statement or a Shelf Registration is filed or
becomes effective, including, without limitation:

                                       20
<PAGE>

                  (i) all registration and filing fees (including, without
limitation, (A) fees with respect to filings required to be made with the NASD
and (B) fees and expenses of compliance with state securities or Blue Sky laws
(including, without limitation, reasonable fees and disbursements of counsel in
connection with Blue Sky qualifications of the Transfer Restricted Securities or
Exchange Securities and determination of the eligibility of the Transfer
Restricted Securities or Exchange Securities for investment under the laws of
such jurisdictions (x) where the Holders are located, in the case of the
Exchange Securities, or (y) as provided in Section 5(f), in the case of Transfer
Restricted Securities or Exchange Securities to be sold by a Participating
Broker-Dealer during the Applicable Period));

                  (ii) printing expenses (including, without limitation,
expenses of printing certificates for Transfer Restricted Securities or Exchange
Securities in a form eligible for deposit with DTC and of printing prospectuses
if the printing of prospectuses is requested by the managing underwriters, if
any, or, in respect of Transfer Restricted Securities or Exchange Securities to
be sold by a Participating Broker-Dealer during the Applicable Period, by the
Holders of a majority in aggregate principal amount of the Transfer Restricted
Securities included in any Registration Statement or of such Exchange
Securities, as the case may be);

                  (iii) messenger, telephone, duplication, word processing and
delivery expenses incurred by the Issuer and the Guarantors in the performance
of their obligations hereunder;

                  (iv) fees and disbursements of counsel for the Issuer, the
Guarantors and, subject to Section 6(b), the Holders;

                  (v) fees and disbursements of all independent certified public
accountants referred to in Section 5(n)(iii) (including, without limitation, the
expenses of any special audit and "cold comfort" letters required by or incident
to such performance);

                  (vi) fees and expenses of any "qualified independent
underwriter" or other independent appraiser participating in an offering
pursuant to Section 2720 of the Conduct Rules of the NASD, but only where the
need for such a "qualified independent underwriter" arises due to a relationship
with the Issuer and the Guarantors;

                  (vii) Securities Act liability insurance, if the Issuer and
the Guarantors so desire such insurance;

                                       21
<PAGE>

                  (viii) fees and expenses of all other Persons, including
special experts, retained by the Issuer or the Guarantors, internal expenses of
the Issuer and the Guarantors (including, without limitation, all salaries and
expenses of their respective officers and employees performing legal or
accounting duties), and the expenses of any annual audit; and

                  (ix) rating agency fees and the fees and expenses incurred in
connection with the listing of the Securities to be registered on any securities
exchange.

         (b) The Issuer and the Guarantors shall reimburse the Holders for the
reasonable fees and disbursements of not more than one counsel (in addition to
appropriate local counsel) chosen by the Holders of a majority in aggregate
principal amount of the Transfer Restricted Securities to be included in any
Registration Statement and other reasonable and necessary out-of-pocket expenses
of the Holders incurred in connection with the registration of the Transfer
Restricted Securities; provided, however, that neither the Issuer nor any
Guarantor shall be required pursuant hereto to pay any underwriting discounts or
commissions.

7.       INDEMNIFICATION.

         (a) Indemnification by the Issuer and the Guarantors. The Issuer and
the Guarantors, jointly and severally, shall, without limitation as to time,
indemnify and hold harmless each Holder, each Person who controls (within the
meaning of Section 15 of the Securities Act or Section 20(a) of the Exchange Act
(any of such persons being hereinafter referred to as a "CONTROLLING PERSON"))
each such Holder and the members, managers, officers, directors, partners,
employees, representatives and agents of each such Holder and controlling person
(collectively, the "HOLDER INDEMNIFIED PARTIES"), to the fullest extent lawful,
from and against any and all losses, claims, damages, liabilities, costs
(including, without limitation, costs of preparation and reasonable attorneys'
fees) and expenses (including, without limitation, costs and expenses incurred
in connection with investigating, preparing, pursuing or defending against any
of the foregoing) (collectively, "LOSSES"), as incurred, directly or indirectly
caused by, related to, based upon, arising out of or in connection with any
untrue or alleged untrue statement of a material fact contained in any
Registration Statement, preliminary prospectus, Prospectus or form of
prospectus, or in any amendment or supplement thereto, or any omission or
alleged omission to state therein a material fact required to be stated therein
or necessary to make the statements therein, in the light of the circumstances
under which they were made, not misleading, except insofar as such Losses are
based upon information relating to a Holder and furnished in writing to the
Issuer and the Guarantors by such Holder expressly for use therein; provided,
that the Issuer and the Guarantors shall

                                       22
<PAGE>

not be liable under the indemnity provided in this Section 7(a) to any Holder
Indemnified Party to the extent that such Loss results solely from an untrue
statement of a material fact contained in, or the omission of a material fact
from, any preliminary prospectus, which untrue statement or omission was
corrected in the Prospectus (as then amended or supplemented) if it shall have
been determined by a court of competent jurisdiction by final and nonappealable
judgment that (i) such Holder sold the Securities concerned to the person
alleging such Loss and failed to send or give, at or prior to the written
confirmation of such sale, a copy of the Prospectus (as then amended or
supplemented), if required by law to have so delivered it, and (ii) the Issuer
had previously furnished copies thereof to such Holder within a reasonable
amount of time prior to such sale or such confirmation, and (iii) the corrected
Prospectus, if delivered, would have been a complete defense against the person
asserting such Loss. The Issuer and each of the Guarantors shall also indemnify
underwriters, selling brokers, dealer managers and similar securities industry
professionals participating in the distribution, their members, managers,
officers, directors, agents and employees and each of their respective
controlling persons to the same extent as provided above with respect to the
indemnification of the Holder Indemnified Parties.

         (b) Indemnification by Holders of Transfer Restricted Securities. In
connection with any Registration Statement, preliminary prospectus, Prospectus
or form of prospectus, or any amendment or supplement thereto, in which a Holder
is participating, such Holder shall furnish to the Issuer and the Guarantors in
writing such information as the Issuer and the Guarantors reasonably request for
use in connection with any such Registration Statement, preliminary prospectus,
Prospectus or form of prospectus, any amendment or supplement thereto, and
shall, severally and not jointly, without limitation as to time, indemnify and
hold harmless the Issuer, the Guarantors and each other Holder and each of their
respective members, partners, managers, directors, officers, agents and
employees, each controlling person of the Issuer or any of the Guarantors and
the members, partners, managers, directors, officers, agents or employees of
such controlling persons, to the fullest extent lawful, from and against any and
all Losses, as incurred, arising out of or based upon any untrue or alleged
untrue statement of a material fact contained in any such Registration
Statement, preliminary prospectus, Prospectus or form of prospectus, or any
amendment or supplement thereto, or any omission or alleged omission to state
therein a material fact required to be stated therein or necessary to make the
statements therein, in the light of the circumstances under which they were
made, not misleading to the extent, but only to the extent, that such untrue
statement or alleged untrue statement of a material fact or omission or alleged
omission of a material fact is contained in or omitted from any information so
furnished in writing by such Holder to the Issuer and the Guarantors expressly
for use in any Registration

                                       23
<PAGE>

Statement, preliminary prospectus, Prospectus or form of prospectus, or any
amendment or supplement thereto. In no event shall the liability of any selling
Holder be greater in amount than the dollar amount of the proceeds (net of
payment of any and all Losses such Holder has been required to pay) received by
such Holder upon the sale of the Transfer Restricted Securities giving rise to
such indemnification obligation.

         (c) Conduct of Indemnification Proceedings. If any Proceeding shall be
brought or asserted against any Person entitled to indemnification hereunder (an
"INDEMNIFIED PARTY"), such indemnified party shall promptly notify the party or
parties from which such indemnification is sought (the "INDEMNIFYING PARTIES")
in writing; provided, that the failure to so notify the indemnifying parties
shall not relieve the indemnifying parties from any obligation or liability
except to the extent (but only to the extent) that it shall be finally
determined by a court of competent jurisdiction (which determination is not
subject to appeal) that the indemnifying parties have been prejudiced materially
by such failure.

                  The indemnifying parties shall have the right, exercisable by
giving written notice to an indemnified party, within 20 Business Days after
receipt of written notice from such indemnified party of such Proceeding, to
assume, at their expense, the defense of any such Proceeding; provided, that an
indemnified party shall have the right to employ separate counsel in any such
Proceeding and to participate in the defense thereof, but the fees and expenses
of such counsel shall be at the expense of such indemnified party or parties
unless: (i) the indemnifying parties have agreed to pay such fees and expenses;
(ii) the indemnifying parties shall have failed promptly to assume the defense
of such Proceeding or shall have failed to employ counsel reasonably
satisfactory to such indemnified party; or (iii) the named parties to any such
Proceeding (including any impleaded parties) include both such indemnified party
and one or more indemnifying parties (or any affiliates or controlling persons
of any of the indemnifying parties), and such indemnified party shall have been
advised by counsel that there may be one or more defenses available to such
indemnified party that are in addition to, or in conflict with, those defenses
available to the indemnifying party or such affiliate or controlling person (in
which case, if such indemnified party notifies the indemnifying parties in
writing that it elects to employ separate counsel at the expense of the
indemnifying parties, the indemnifying parties shall not have the right to
assume the defense thereof and the reasonable fees and expenses of such counsel
shall be at the expense of the indemnifying parties; it being understood,
however, that the indemnifying parties shall not, in connection with any one
such Proceeding or separate but substantially similar or related Proceedings in
the same jurisdiction arising out of the same general allegations or
circumstances, be liable for the fees and expenses of more than one separate

                                       24
<PAGE>

firm of attorneys (together with appropriate local counsel) at any time for such
indemnified party).

                  No indemnifying party shall be liable for any settlement of
any such Proceeding effected without its written consent, but if settled with
its written consent, or if there be a final judgment for the plaintiff in any
such Proceeding, each indemnifying party jointly and severally agrees, subject
to the exceptions and limitations set forth above, to indemnify and hold
harmless each indemnified party from and against any and all Losses by reason of
such settlement or judgment. The indemnifying party shall not consent to the
entry of any judgment or enter into any settlement that does not include as an
unconditional term thereof the giving by the claimant or plaintiff to each
indemnified party of a release, in form and substance reasonably satisfactory to
the indemnified party, from all liability in respect of such Proceeding for
which such indemnified party would be entitled to indemnification hereunder
(whether or not any indemnified party is a party thereto).

         (d) Contribution. If the indemnification provided for in this Section 7
is unavailable to an indemnified party or is insufficient to hold such
indemnified party harmless for any Losses in respect of which this Section 7
would otherwise apply by its terms (other than by reason of exceptions provided
in this Section 7), then each applicable indemnifying party, in lieu of
indemnifying such indemnified party, shall have a joint and several obligation
to contribute to the amount paid or payable by such indemnified party as a
result of such Losses, (i) in such proportion as is appropriate to reflect the
relative benefits received by the indemnifying party, on the one hand, and such
indemnified party, on the other hand, from their sale of Transfer Restricted
Securities, or (ii) if the allocation provided by clause (i) above is not
permitted by applicable law, in such proportion as is appropriate to reflect not
only the relative benefits referred to in clause (i) above but also the relative
fault of the indemnifying party, on the one hand, and such indemnified party, on
the other hand, in connection with the actions, statements or omissions that
resulted in such Losses as well as any other relevant equitable considerations.
The relative fault of such indemnifying party, on the one hand, and indemnified
party, on the other hand, shall be determined by reference to, among other
things, whether any untrue or alleged untrue statement of a material fact or
omission or alleged omission to state a material fact relates to information
supplied by such indemnifying party or indemnified party, and the parties'
relative intent, knowledge, access to information and opportunity to correct or
prevent any such statement or omission. The amount paid or payable by an
indemnified party as a result of any Losses shall be deemed to include any legal
or other fees or expenses incurred by such party in connection with any
Proceeding, to the extent such party would have been indemnified for such fees
or expenses if the indemnification provided for in Section 7(a) or 7(b) were
available to such party.

                                       25
<PAGE>

                  The parties hereto agree that it would not be just and
equitable if contribution pursuant to this Section 7(d) were determined by pro
rata allocation or by any other method of allocation that does not take account
of the equitable considerations referred to in the immediately preceding
paragraph. Notwithstanding the provisions of this Section 7(d), an indemnifying
party that is a selling Holder shall not be required to contribute, in the
aggregate, any amount in excess of such Holder's Maximum Contribution Amount. A
selling Holder's "MAXIMUM CONTRIBUTION AMOUNT" shall equal the excess, if any,
of (i) the aggregate proceeds received by such Holder pursuant to the sale of
such Transfer Restricted Securities over (ii) the aggregate amount of damages
that such Holder has otherwise been required to pay by reason of such untrue or
alleged untrue statement or omission or alleged omission. No person guilty of
fraudulent misrepresentation (within the meaning of Section 11(f) of the
Securities Act) shall be entitled to contribution from any Person who was not
guilty of such fraudulent misrepresentation. The Holders' obligations to
contribute pursuant to this Section 7(d) are several in proportion to the
respective principal amount of the Transfer Restricted Securities held by each
Holder hereunder and not joint. The Issuer's and the Guarantors' obligations to
contribute pursuant to this Section 7(d) are joint and several.

                  The indemnity and contribution agreements contained in this
Section 7 are in addition to any liability that the indemnifying parties
otherwise may have to the indemnified parties.

8.       RULE 144 AND RULE 144A.

                  The Issuer and each of the Guarantors covenants that it shall
(a) file the reports required to be filed by it (if so required) under the
Securities Act and the Exchange Act in a timely manner and, if at any time any
such Person is not required to file such reports, it will, upon the request of
any Holder, make available to each Holder or beneficial owner of Transfer
Restricted Securities and to any prospective purchaser of Transfer Restricted
Securities designated by such Holder or beneficial owner the information
required by Rule 144A(d)(4) under the Securities Act to permit sales pursuant to
Rule 144A and (b) take such further action as any Holder may reasonably request,
all to the extent required from time to time to enable such Holder to sell
Transfer Restricted Securities without registration under the Securities Act
pursuant to the exemptions provided by Rule 144 and Rule 144A. Upon the request
of any Holder, the Issuer and each of the Guarantors shall deliver to such
Holder a written statement as to whether the Issuer or such Guarantor has
complied with such information requirements. Nothing in this Section 8 shall be
deemed to require the Issuer or any of the Guarantors to register any Securities
pursuant to the Exchange Act.

                                       26
<PAGE>

9.       UNDERWRITTEN REGISTRATIONS.

                  If any of the Transfer Restricted Securities covered by any
Shelf Registration are to be sold in an Underwritten Offering, the investment
banker or investment bankers and manager or managers that will manage the
offering will be selected by the Holders of a majority in aggregate principal
amount of such Transfer Restricted Securities included in such offering.

                  No Holder may participate in any Underwritten Registration
hereunder unless such Holder (a) agrees to sell such Holder's Transfer
Restricted Securities on the basis provided in any underwriting arrangements
approved by the Persons entitled hereunder to approve such arrangements and (b)
completes and executes all questionnaires, powers of attorney, underwriting
agreements and other documents reasonably required under the terms of such
underwriting arrangements.

10.      MISCELLANEOUS.

         (a) Remedies. In the event of a breach by the Issuer or any of the
Guarantors of any of their respective obligations under this Agreement, each
Holder, in addition to being entitled to exercise all rights provided herein, in
the Indenture or, in the case of the Initial Purchasers, in the Purchase
Agreement, or granted by law, including recovery of damages, will be entitled to
specific performance of its rights under this Agreement. The Issuer and the
Guarantors agree that monetary damages would not be adequate compensation for
any loss incurred by reason of a breach by the Issuer or any of the Guarantors
of any of the provisions of this Agreement and hereby further agree that, in the
event of any action for specific performance in respect of such breach, the
Issuer and the Guarantors shall waive the defense that a remedy at law would be
adequate.

         (b) No Inconsistent Agreements. The Issuer and the Guarantors have not
entered into, as of the date hereof, and shall not enter into, after the date of
this Agreement, any agreement with respect to any of their respective securities
that is inconsistent with the rights granted to the Holders in this Agreement or
otherwise conflicts with the provisions hereof.

         (c) Amendments and Waivers. The provisions of this Agreement, including
the provisions of this sentence, may not be amended, modified or supplemented,
and waivers or consents to departures from the provisions hereof may not be
given, unless the Issuer and the Guarantors have obtained the written consent of
Holders of at least a majority of the then outstanding aggregate principal
amount of Transfer Restricted Securities; provided, that Sections 4(a) and 7
shall not be amended, modified or supplemented, and waivers or consents to
departures from this

                                       27
<PAGE>

proviso may not be given, unless the Issuer has obtained the written consent of
each Holder. Notwithstanding the foregoing, a waiver or consent to depart from
the provisions hereof with respect to a matter that relates exclusively to the
rights of Holders whose securities are being sold pursuant to a Registration
Statement and that does not directly or indirectly affect the rights of other
Holders may be given by Holders of at least a majority in aggregate principal
amount of the Transfer Restricted Securities being sold by such Holders pursuant
to such Registration Statement; provided that the provisions of this sentence
may not be amended, modified or supplemented except in accordance with the
provisions of the immediately preceding sentence.

         (d) Notices. All notices and other communications (including, without
limitation, any notices or other communications to the Trustee) provided for or
permitted hereunder shall be made in writing by hand-delivery, certified
first-class mail with return receipt requested, next-day air courier or
facsimile:

                  (i) if to a Holder, at the most current address given by such
Holder to the Issuer in accordance with the provisions of this Section 10(d),
which address initially is, with respect to each Holder, the address of such
Holder maintained by the Registrar (as defined in the Indenture), with a copy to
Skadden, Arps, Slate, Meagher & Flom LLP, 300 South Grand Avenue, Suite 3400,
Los Angeles, California 90071, facsimile number (213) 687-5600, Attention:
Rodrigo A. Guerra, Esq.; and

                  (ii) if to the Issuer or any of the Guarantors, initially at
3600 Chase Tower, 2200 Ross Avenue, Dallas, Texas 75201, Attention: Chief
Financial Officer, and Attention: General Counsel, with a copy to Haynes and
Boone, LLP, 901 Main Street, Suite 3100, Dallas, Texas 75202, facsimile number
(214) 651-5000, Attention: William R. Hays, III, Esq., and thereafter at such
other address, notice of which is given in accordance with the provisions of
this Section 10(d).

                  All such notices and communications shall be deemed to have
been duly given: when delivered by hand, if personally delivered; five Business
Days after being deposited in the mail, postage prepaid, if mailed; one Business
Day after being timely delivered to a next-day air courier, if sent by next-day
air courier; and when receipt is acknowledged by the addressee, if sent by
facsimile.

                  Copies of all such notices, demands or other communications
shall be concurrently delivered by the Person giving the same to the Trustee
under the Indenture at the address specified in the Indenture.

                                       28
<PAGE>

         (e) Successors and Assigns. This Agreement shall inure to the benefit
of and be binding upon the successors and assigns of each of the parties,
including, without limitation and without the need for an express assignment,
subsequent Holders.

         (f) Counterparts. This Agreement may be executed in any number of
counterparts and by the parties hereto in separate counterparts, each of which
when so executed shall be deemed to be an original and all of which taken
together shall constitute one and the same agreement.

         (g) Headings. The headings in this Agreement are for convenience of
reference only and shall not limit or otherwise affect the meaning hereof. When
a reference is made in this Agreement to a Section, paragraph, subparagraph,
Schedule or Exhibit, such reference shall mean a Section, paragraph,
subparagraph, Schedule or Exhibit to this Agreement unless otherwise indicated.
The words "INCLUDE," "INCLUDES," and "INCLUDING" when used in this Agreement
shall be deemed in each case to be followed by the words "WITHOUT LIMITATION."
The phrases "THE DATE OF THIS AGREEMENT," "THE DATE HEREOF," and terms of
similar import, unless the context otherwise requires, shall be deemed to refer
to December 12, 2001. The words "HEREOF," "HEREIN," "HEREWITH," "HEREBY" and
"HEREUNDER" and words of similar import shall, unless otherwise stated, be
construed to refer to this Agreement as a whole and not to any particular
provision of this Agreement.

         (h) GOVERNING LAW. THIS AGREEMENT SHALL BE CONSTRUED AND INTERPRETED,
AND THE RIGHTS OF THE PARTIES SHALL BE DETERMINED IN ACCORDANCE WITH THE LAWS OF
THE STATE OF NEW YORK, INCLUDING WITHOUT LIMITATION, SECTIONS 5-1401 AND 5-1402
OF THE NEW YORK GENERAL OBLIGATIONS LAW AND RULE 327(b) OF NEW YORK CIVIL
PRACTICE LAWS AND RULES. THE ISSUER AND EACH GUARANTOR HEREBY IRREVOCABLY
SUBMITS TO THE JURISDICTION OF ANY NEW YORK STATE COURT SITTING IN THE BOROUGH
OF MANHATTAN IN THE CITY OF NEW YORK OR ANY FEDERAL COURT SITTING IN THE BOROUGH
OF MANHATTAN IN THE CITY OF NEW YORK IN RESPECT OF ANY SUIT, ACTION OR
PROCEEDING ARISING OUT OF OR RELATING TO THIS AGREEMENT, AND IRREVOCABLY ACCEPTS
FOR ITSELF AND IN RESPECT OF ITS PROPERTY, GENERALLY AND UNCONDITIONALLY,
JURISDICTION OF THE AFORESAID COURTS. THE ISSUER AND EACH GUARANTOR IRREVOCABLY
WAIVES, TO THE FULLEST EXTENT IT MAY EFFECTIVELY DO SO UNDER APPLICABLE LAW,
TRIAL BY JURY AND ANY OBJECTION THAT IT MAY NOW OR HEREAFTER HAVE TO THE LAYING
OF THE VENUE OF ANY SUCH SUIT, ACTION OR PROCEEDING BROUGHT IN ANY SUCH COURT

                                       29
<PAGE>

AND ANY CLAIM THAT ANY SUCH SUIT, ACTION OR PROCEEDING BROUGHT IN SUCH COURT HAS
BEEN BROUGHT IN AN INCONVENIENT FORUM. THE ISSUER AND EACH GUARANTOR IRREVOCABLY
CONSENTS, TO THE FULLEST EXTENT IT MAY EFFECTIVELY DO SO UNDER APPLICABLE LAW,
TO THE SERVICE OF PROCESS OF ANY OF THE AFOREMENTIONED COURTS IN ANY SUCH ACTION
OR PROCEEDING BY THE MAILING OF COPIES THEREOF BY REGISTERED OR CERTIFIED MAIL,
POSTAGE PREPAID, TO THE ISSUER OR SUCH GUARANTOR, AS THE CASE MAY BE, AT ITS
ADDRESS SET FORTH HEREIN, SUCH SERVICE TO BECOME EFFECTIVE 30 DAYS AFTER SUCH
MAILING. NOTHING HEREIN SHALL AFFECT THE RIGHT OF THE INITIAL PURCHASERS TO
SERVE PROCESS IN ANY OTHER MANNER PERMITTED BY LAW OR TO COMMENCE LEGAL
PROCEEDINGS OR OTHERWISE PROCEED AGAINST THE ISSUER OR ANY OF THE GUARANTORS IN
ANY OTHER JURISDICTION.

         (i) Severability. If any term, provision, covenant or restriction of
this Agreement is held by a court of competent jurisdiction to be invalid,
illegal, void or unenforceable, the remainder of the terms, provisions,
covenants and restrictions set forth herein shall remain in full force and
effect and shall in no way be affected, impaired or invalidated, and the parties
hereto shall use their respective best efforts to find and employ an alternative
means to achieve the same or substantially the same result as that contemplated
by such term, provision, covenant or restriction. It is hereby stipulated and
declared to be the intention of the parties that they would have executed the
remaining terms, provisions, covenants and restrictions without including any of
such that may be hereafter declared invalid, illegal, void or unenforceable.

         (j) Entire Agreement. This Agreement is intended by the parties as a
final expression of their agreement, and is intended to be a complete and
exclusive statement of the agreement and understanding of the parties hereto in
respect of the subject matter contained herein. There are no restrictions,
promises, warranties or undertakings, other than those set forth or referred to
herein, with respect to the registration rights granted by the Issuer and the
Guarantors in respect of securities sold pursuant to the Purchase Agreement.
This Agreement supersedes all prior agreements and understandings between the
parties with respect to such subject matter.

         (k) Attorneys' Fees. In any Proceeding brought to enforce any provision
of this Agreement, or where any provision hereof is validly asserted as a
defense, the prevailing party, as determined by the courts, shall be entitled to
recover reasonable

                                       30
<PAGE>

attorneys' fees in addition to its costs and expenses and any other available
remedy.

         (l) Securities Held by the Issuer or its Affiliates. Whenever the
consent or approval of Holders of a specified percentage of the principal amount
of Transfer Restricted Securities is required hereunder, Transfer Restricted
Securities held by the Issuer or its affiliates (as such term is defined in Rule
405 under the Securities Act) (other than any Holder deemed to be such an
affiliate solely by reason of its holdings of such Transfer Restricted
Securities or any Initial Purchaser deemed to be such an affiliate) shall not be
counted in determining whether such consent or approval was given by the Holders
of such required percentage.

                       [signature pages follow this page]

                                       31
<PAGE>

                  IN WITNESS WHEREOF, the parties have executed this Agreement
as of the date first written above.

                                               Very truly yours,

                                            RADIOLOGIX, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            GUARANTORS:

                                            IDE IMAGING PARTNERS, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            PACIFIC IMAGING PARTNERS, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            QUESTAR IMAGING, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

<PAGE>

                                            WB&A IMAGING PARTNERS, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            TREASURE COAST IMAGING PARTNERS,
                                            INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            RADIOLOGIX SERVICES, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            ADVANCED IMAGING PARTNERS, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            MID ROCKLAND IMAGING PARTNERS, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

<PAGE>

                                            RADIOLOGY AND NUCLEAR MEDICINE
                                            IMAGING PARTNERS, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            COMMUNITY IMAGING PARTNERS, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            VALLEY IMAGING PARTNERS, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            SAN JOSE IMAGING PARTNERS, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            ADVANCED RADIOLOGY, LLC

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

<PAGE>

                                            ADVANCED MEDICAL IMAGING, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            M&S IMAGING PARTNERS I, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            M&S IMAGING PARTNERS, L.P.

                                            By: M&S Imaging Partners I, Inc.,
                                            its general partner

                                                By:
                                                    ----------------------------
                                                    Name:
                                                    Title:

                                            QUESTAR CLEVELAND, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            QUESTAR TAMPA, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

<PAGE>

                                            QUESTAR ORLANDO, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            ROCKY MOUNTAIN OPENSCAN MRI, LLC

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            PREMIER ADVANCED IMAGING NETWORK,
                                            LTD.

                                            By: Questar Orlando, Inc., its
                                            general partner

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            QUESTAR IMAGING MB, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            QUESTAR KANSAS, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

<PAGE>

                                            QUESTAR PVH, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            QUESTAR SAN FRANCISCO, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            QUESTAR HENDERSON, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            QUESTAR TRISTATES, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            QUESTAR PHILADELPHIA, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

<PAGE>

                                            QUESTAR WESTWOOD, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            QUESTAR DULUTH, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            QUESTAR LINCOLN, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            QUESTAR H F M C, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            QUESTAR PALM SPRINGS, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

<PAGE>

                                            QUESTAR ATLANTA, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            QUESTAR MT. LAUREL, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            QUESTAR LOWER BUCKS, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            QUESTAR TOLEDO, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            QUESTAR SOUTH CHICAGO, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

<PAGE>

                                            QUESTAR NORTH GEORGIA, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            QUESTAR LOS ALAMITOS, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            QUESTAR DES PLAINES, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            QUESTAR VICTORVILLE, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            QUESTAR COLUMBUS, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

<PAGE>

                                            QUESTAR NAPERVILLE, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            QUESTAR QUAKERTOWN, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                            QUESTAR TUCSON, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

<PAGE>

                                            M&S IMAGING INVESTMENTS, INC.

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

<PAGE>
ACCEPTED AND AGREED TO:

JEFFERIES & COMPANY, INC.

By:
    ---------------------------
    Name:
    Title:

DEUTSCHE BANC ALEX. BROWN INC.

By:
    ---------------------------
    Name:
    Title:

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