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                                                                   EXHIBIT 10.22

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                              EMPLOYMENT AGREEMENT

                                 BY AND BETWEEN

                           NOBLE DRILLING CORPORATION

                                       AND

                                 MARK A. JACKSON

                                September 1, 2000

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                              EMPLOYMENT AGREEMENT
                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                             Page
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<S>                                                                                          <C>
1.  Employment..................................................................................1

2.  Employment Term.............................................................................1
    (a)         Term............................................................................1
    (b)         Relationship Prior to Effective Date............................................1

3.  Positions and Duties........................................................................2

4.  Compensation and Related Matters............................................................3
    (a)         Base Salary.....................................................................3
    (b)         Annual Bonus....................................................................3
    (c)         Employee Benefits...............................................................4
                         (i)  Incentive, Savings, and Retirement Plans..........................4
                         (ii) Welfare Benefit Plans.............................................4
    (d)         Expenses........................................................................4
    (e)         Fringe Benefits.................................................................4
    (f)         Vacation........................................................................5

5.  Termination of Employment...................................................................5
    (a)         Death...........................................................................5
    (b)         Disability......................................................................5
    (c)         Termination by Company..........................................................5
    (d)         Termination by Executive........................................................6
    (e)         Notice of Termination...........................................................7
    (f)         Date of Termination.............................................................7

6.  Obligations of the Company Upon Termination.................................................8
    (a)         Good Reason or During the Window Period; Other Than for
                Cause, Death, or Disability.....................................................8
    (b)         Death..........................................................................10
    (c)         Disability.....................................................................11
    (d)         Cause; Other Than for Good Reason or During the Window
                Period.........................................................................11

7.  Certain Additional Payments by the Company.................................................12

8.  Representations and Warranties.............................................................14

9.  Confidential Information...................................................................14
</TABLE>

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<TABLE>
<CAPTION>
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<S>                                                                                          <C>
10. Certain Definitions........................................................................15
    (a)         Effective Date.................................................................15
    (b)         Change of Control Period.......................................................15
    (c)         Change of Control..............................................................15

11. Full Settlement............................................................................17

12. No Effect on Other Contractual Rights......................................................18

13. Indemnification; Directors and Officers Insurance..........................................18

14. Injunctive Relief..........................................................................18

15. Governing Law..............................................................................18

16. Notices....................................................................................18

17. Binding Effect; Assignment; No Third Party Benefit.........................................19

18. Miscellaneous..............................................................................19
    (a)         Amendment......................................................................19
    (b)         Waiver.........................................................................20
    (c)         Withholding Taxes..............................................................20
    (d)         Nonalienation of Benefits......................................................20
    (e)         Severability...................................................................20
    (f)         Entire Agreement...............................................................20
    (g)         Captions.......................................................................20
    (h)         References.....................................................................20
</TABLE>

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                              EMPLOYMENT AGREEMENT

     This EMPLOYMENT AGREEMENT (this "Agreement"), dated as of September 1, 2000
by and between NOBLE DRILLING CORPORATION, a Delaware corporation (the
"Company"), and MARK A. JACKSON (the "Executive");

                              W I T N E S S E T H:

     WHEREAS, the Board of Directors of the Company (the "Board") has determined
that it is in the best interests of the Company and its stockholders to assure
that the Company will have the continued dedication of the Executive,
notwithstanding the possibility, threat, or occurrence of a Change of Control
(as defined in Paragraph 10(c)) of the Company; and

     WHEREAS, the Board believes it is imperative to diminish the inevitable
distraction of the Executive by virtue of the personal uncertainties and risks
created by a pending or threatened Change of Control and to encourage the
Executive's full attention and dedication to the Company currently and in the
event of any pending or threatened Change of Control, and to provide the
Executive with compensation and benefits upon a Change of Control which ensure
that the compensation and benefits expectations of the Executive will be
satisfied and which are competitive with those of other corporations; and

     WHEREAS, in order to accomplish these objectives, the Board has caused the
Company to enter into this Agreement;

     NOW, THEREFORE, in consideration of the premises and the mutual covenants
and agreements herein contained, and intending to be legally bound hereby, the
Company and the Executive hereby agree as follows:

     1. Employment. The Company agrees that the Company or an affiliated company
(as hereafter defined) will continue the Executive in its employ, and the
Executive agrees to remain in the employ of the Company or an affiliated
company, for the period set forth in Paragraph 2(a), in the positions and with
the duties and responsibilities set forth in Paragraph 3, and upon the other
terms and conditions herein provided. As used in this Agreement, the term
"affiliated company" shall include any company controlled by, controlling, or
under common control with the Company.

     2. Employment Term.

     (1) Term. The employment of the Executive by the Company as provided in
Paragraph 1 shall be for the period commencing on the Effective Date (as defined
in Paragraph 10 (a)) through and ending on the third anniversary of such date
(the "Employment Term").

     (2) Relationship Prior to Effective Date. The Executive and the Company
acknowledge that, except as may otherwise be provided under any written
agreement between the Executive and the Company other than this Agreement, the
employment of the Executive by the Company is "at will" and, prior to the
Effective Date, may be terminated by either the Executive or

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the Company at any time. Moreover, if prior to the Effective Date, the
Executive's employment with the Company terminates, then the Executive shall
have no further rights under this Agreement. For purposes of this Paragraph 2(b)
only, the term Company shall mean and include the company that employs
Executive, whether Noble Drilling Corporation or an affiliated company of Noble
Drilling Corporation.

     3. Positions and Duties.

     (1) During the Employment Term, the Executive's position (including status,
offices, titles, and reporting requirements), duties, functions,
responsibilities, and authority shall be at least commensurate in all material
respects with the most significant of those held or exercised by or assigned to
the Executive in respect of the Company and its affiliated companies at any time
during the 120-day period immediately preceding the Effective Date.

     (2) During the Employment Term, the Executive shall devote the Executive's
full time, skill, and attention and the Executive's reasonable best efforts
during normal business hours to the business and affairs of the Company, and in
furtherance of the business and affairs of its affiliated companies, to the
extent necessary to discharge faithfully and efficiently the duties and
responsibilities delegated and assigned to the Executive herein or pursuant
hereto, except for usual, ordinary, and customary periods of vacation and
absence due to illness or other disability; provided, however, that the
Executive may (i) serve on industry-related, civic or charitable boards or
committees, (ii) with the approval of the Board, serve on corporate boards or
committees, (iii) deliver lectures, fulfill speaking engagements, or teach at
educational institutions, and (iv) manage the Executive's personal investments,
so long as such activities do not significantly interfere with the performance
and fulfillment of the Executive's duties and responsibilities as an employee of
the Company or an affiliated company in accordance with this Agreement and, in
the case of the activities described in clause (ii) of this proviso, will not,
in the good faith judgment of the Board, constitute an actual or potential
conflict of interest with the business of the Company or an affiliated company.
It is expressly understood and agreed that, to the extent that any such
activities have been conducted by the Executive during the term of the
Executive's employment by the Company or its affiliated companies prior to the
Effective Date consistent with the provisions of this Paragraph 3(b), the
continued conduct of such activities (or of activities similar in nature and
scope thereto) subsequent to the Effective Date shall not thereafter be deemed
to interfere with the performance and fulfillment of the Executive's duties and
responsibilities to the Company.

     (3) In connection with the Executive's employment hereunder, the Executive
shall be based at the location where the Executive was regularly employed
immediately prior to the Effective Date or any office which is the headquarters
of the Company and is less than 50 miles from such location, subject, however,
to required travel on the business of the Company to an extent substantially
consistent with the Executive's business travel obligations during the
three-year period immediately preceding the Effective Date.

     (4) All services that the Executive may render to the Company or any of its
affiliated companies in any capacity during the Employment Term shall be deemed
to be services required by this Agreement and consideration for the compensation
provided for herein.

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     4. Compensation and Related Matters.

     (1) Base Salary. During the Employment Term, the Executive shall receive an
annual base salary ("Base Salary") at least equal to 12 times the highest
monthly base salary paid or payable, including any base salary that has been
earned but deferred, to the Executive by the Company and its affiliated
companies in respect of the 12-month period immediately preceding the month in
which the Effective Date occurs. The Base Salary shall be payable in
installments in accordance with the general payroll practices of the Company in
effect at the time such payment is made, but in no event less frequently than
monthly, or as otherwise mutually agreed upon. During the Employment Term, the
Executive's Base Salary shall be subject to such increases (but not decreases)
as may be determined from time to time by the Board in its sole discretion;
provided, however, that the Executive's Base Salary (i) shall be reviewed by the
Board no later than 12 months after the last salary increase awarded to the
Executive prior to the Effective Date and thereafter at least annually, with a
view to making such upward adjustment, if any, as the Board deems appropriate,
and (ii) shall be increased at any time and from time to time as shall be
substantially consistent with increases in base salary generally awarded in the
ordinary course of business to the Executive's peer executives of the Company or
any of its affiliated companies. Base Salary shall not be reduced after any such
increase. The term Base Salary as used in this Agreement shall refer to the Base
Salary as so increased. Payments of Base Salary to the Executive shall not be
deemed exclusive and shall not prevent the Executive from participating in any
employee benefit plans, programs, or arrangements of the Company and its
affiliated companies in which the Executive is entitled to participate. Payments
of Base Salary to the Executive shall not in any way limit or reduce any other
obligation of the Company hereunder, and no other compensation, benefit, or
payment to the Executive hereunder shall in any way limit or reduce the
obligation of the Company regarding the Executive's Base Salary hereunder.

     (2) Annual Bonus. In addition to Base Salary, the Executive shall be
awarded, in respect of each fiscal year of the Company ending during the
Employment Term, an annual bonus (the "Annual Bonus") in cash in an amount at
least equal to the Executive's highest aggregate bonus under all Company bonus
plans, programs, arrangements, and awards (including the Company's Short-Term
Incentive Plan and any successor plan), in respect of any fiscal year in the
three full fiscal year period ended immediately prior to the Effective Date
(annualized for any fiscal year consisting of less than 12 full months or with
respect to which the Executive has been employed by the Company for less than 12
full months) (such highest amount is hereinafter referred to as the "Recent
Annual Bonus"). Each such Annual Bonus shall be paid no later than the end of
the third month of the fiscal year next following the fiscal year in respect of
which the Annual Bonus is awarded, unless the Executive shall elect to defer the
receipt of such Annual Bonus.

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     (3) Employee Benefits.

          (1) Incentive, Savings, and Retirement Plans. During the Employment
     Term, the Executive shall be entitled to participate in all incentive,
     savings, and retirement plans, programs, and arrangements applicable
     generally to the Executive's peer executives of the Company and its
     affiliated companies, but in no event shall such plans, programs, and
     arrangements provide the Executive with incentive opportunities (measured
     with respect to both regular and special incentive opportunities, to the
     extent, if any, that such distinction is applicable), savings
     opportunities, and retirement benefit opportunities, in each case, less
     favorable, in the aggregate, than the most favorable of those provided by
     the Company and its affiliated companies for the Executive under such
     plans, programs, and arrangements as in effect at any time during the
     120-day period immediately preceding the Effective Date or, if more
     favorable to the Executive, those provided generally at any time after the
     Effective Date to the Executive's peer executives of the Company and its
     affiliated companies.

          (2) Welfare Benefit Plans. During the Employment Term, the Executive
     and/or the Executive's family, as the case may be, shall be eligible to
     participate in and shall receive all benefits under all welfare benefit
     plans, programs, and arrangements provided by the Company and its
     affiliated companies (including, without limitation, medical, prescription,
     dental, disability, salary continuance, employee life, group life,
     accidental death, and travel accident insurance plans, programs, and
     arrangements) to the extent applicable generally to the Executive's peer
     executives of the Company and its affiliated companies, but in no event
     shall such plans, programs, and arrangements provide the Executive with
     welfare benefits that are less favorable, in the aggregate, than the most
     favorable of such plans, programs, and arrangements as in effect for the
     Executive at any time during the 120-day period immediately preceding the
     Effective Date or, if more favorable to the Executive, those provided
     generally at any time after the Effective Date to the Executive's peer
     executives of the Company and its affiliated companies.

     (4) Expenses. During the Employment Term, the Executive shall be entitled
to receive prompt reimbursement for all reasonable expenses incurred by the
Executive in performing the Executive's duties and responsibilities hereunder,
in accordance with the most favorable policies, practices, and procedures of the
Company and its affiliated companies as in effect for the Executive at any time
during the 120-day period immediately preceding the Effective Date or, if more
favorable to the Executive, as in effect generally at any time thereafter with
respect to the Executive's peer executives of the Company and its affiliated
companies.

     (5) Fringe Benefits. During the Employment Term, the Executive shall be
entitled to fringe benefits, including, without limitation, tax and financial
planning services, payment of club dues, and, if applicable, use of an
automobile and payment of related expenses, in accordance with the most
favorable policies, practices, and procedures of the Company and its affiliated
companies as in effect for the Executive at any time during the 120-day period
immediately preceding the Effective Date or, if more favorable to the Executive,
as in effect generally at any time after the Effective Date with respect to the
Executive's peer executives of the Company and its affiliated companies.

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     (6) Vacation. During the Employment Term, the Executive shall be entitled
to paid vacation and such other paid absences, whether for holidays, illness,
personal time, or any similar purposes, in accordance with the most favorable
policies, practices, and procedures of the Company and its affiliated companies
as in effect for the Executive at any time during the 120-day period immediately
preceding the Effective Date or, if more favorable to the Executive, as in
effect generally at any time after the Effective Date with respect to the
Executive's peer executives of the Company and its affiliated companies.

     5. Termination of Employment.

     (1) Death. The Executive's employment shall terminate automatically upon
the Executive's death during the Employment Term.

     (2) Disability. If the Company determines in good faith that the Disability
(as defined below) of the Executive has occurred during the Employment Term, the
Company may give the Executive notice of its intention to terminate the
Executive's employment. In such event, the Executive's employment hereunder
shall terminate effective on the 30th day after receipt of such notice by the
Executive (the "Disability Effective Date"), provided that, within the 30-day
period after such receipt, the Executive shall not have returned to full-time
performance of the Executive's duties. For purposes of this Agreement,
"Disability" shall mean the absence of the Executive from the Executive's duties
hereunder on a full-time basis for an aggregate of 180 days within any given
period of 270 consecutive days (in addition to any statutorily required leave of
absence and any leave of absence approved by the Company), as a result of
incapacity of the Executive, despite any reasonable accommodation required by
law, due to bodily injury or disease or any other mental or physical illness,
which will, in the opinion of a physician selected by the Company or its
insurers and acceptable to the Executive or the Executive's legal
representative, be permanent and continuous during the remainder of the
Executive's life.

     (3) Termination by Company. The Company may terminate the Executive's
employment hereunder for Cause (as defined below). For purposes of this
Agreement, "Cause" shall mean:

          (1) the willful and continued failure of the Executive to perform
     substantially the Executive's duties hereunder (other than any such failure
     resulting from bodily injury or disease or any other incapacity due to
     mental or physical illness), after a written demand for substantial
     performance is delivered to the Executive by the Board or the Chief
     Executive Officer of the Company which specifically identifies the manner
     in which the Board or Chief Executive Officer believes the Executive has
     not substantially performed the Executive's duties; or

          (2) the willful engaging by the Executive in illegal conduct or gross
     misconduct that is materially and demonstrably detrimental to the Company,
     monetarily or otherwise.

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For purposes of this provision, no act, or failure to act, on the part of the
Executive shall be considered "willful" unless done, or omitted to be done, by
the Executive in bad faith or without reasonable belief that the Executive's
action or omission was in the best interests of the Company. Any act, or failure
to act, based upon authority given pursuant to a resolution duly adopted by the
Board or upon the instructions of the Chief Executive Officer or another senior
officer of the Company or based upon the advice of counsel for the Company shall
be conclusively presumed to be done, or omitted to be done, by the Executive in
good faith and in the best interests of the Company. The cessation of employment
of the Executive shall not be deemed to be for Cause unless and until there
shall have been delivered to the Executive a copy of a resolution duly adopted
by the affirmative vote of not less than two-thirds of the entire membership of
the Board then in office at a meeting of the Board called and held for such
purpose (after reasonable notice is provided to the Executive and the Executive
is given an opportunity, together with counsel, to be heard before the Board)
finding that, in the good faith opinion of the Board, the Executive is guilty of
the conduct described in subparagraph (i) or (ii) above, and specifying the
particulars thereof in detail.

     (4) Termination by Executive. The Executive may terminate the Executive's
employment hereunder (i) at any time during the Employment Term for Good Reason
(as defined below) or (ii) during the Window Period (as defined below) without
any reason.

For purposes of this Agreement, the "Window Period" shall mean the 30-day period
immediately following the first anniversary of the Effective Date, and "Good
Reason" shall mean any of the following (without the Executive's express written
consent):

          (1) the assignment to the Executive of any duties inconsistent in any
     respect with the Executive's position (including status, offices, titles,
     and reporting requirements), duties, functions, responsibilities, or
     authority as contemplated by Paragraph 3(a) of this Agreement, or any other
     action by the Company that results in a diminution in such position,
     duties, functions, responsibilities, or authority, excluding for this
     purpose an isolated, insubstantial, and inadvertent action not taken in bad
     faith and which is remedied by the Company promptly after receipt of notice
     thereof given by the Executive;

          (2) any failure by the Company to comply with any of the provisions of
     Paragraph 4 of this Agreement, other than an isolated, insubstantial, and
     inadvertent action not taken in bad faith and which is remedied by the
     Company promptly after receipt of notice thereof given by the Executive;

          (3) the Company's requiring the Executive to be based at any office or
     location other than as provided in Paragraph 3(c) of this Agreement or the
     Company's requiring the Executive to travel on Company business to a
     substantially greater extent than during the three-year period immediately
     preceding the Effective Date;

          (4) any failure by the Company to comply with and satisfy Paragraph
     17(c) of this Agreement; or

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          (5) any purported termination by the Company of the Executive's
     employment hereunder otherwise than as expressly permitted by this
     Agreement, and for purposes of this Agreement, no such purported
     termination shall be effective.

For purposes of this Paragraph 5(d), any good faith determination of "Good
Reason" made by the Executive shall be conclusive.

     (5) Notice of Termination. Any termination of the Executive's employment
hereunder by the Company or by the Executive (other than a termination pursuant
to Paragraph 5(a)) shall be communicated by a Notice of Termination (as defined
below) to the other party hereto. For purposes of this Agreement, a "Notice of
Termination" shall mean a notice which (i) indicates the specific termination
provision in this Agreement relied upon, (ii) in the case of a termination for
Disability, Cause, or Good Reason, sets forth in reasonable detail the facts and
circumstances claimed to provide a basis for termination of the Executive's
employment under the provision so indicated, and (iii) specifies the Date of
Termination (as defined in Paragraph 5(f) below); provided, however, that,
notwithstanding any provision in this Agreement to the contrary, a Notice of
Termination given in connection with a termination for Good Reason shall be
given by the Executive within a reasonable period of time, not to exceed 120
days, following the occurrence of the event giving rise to such right of
termination. The failure by the Company or the Executive to set forth in the
Notice of Termination any fact or circumstance which contributes to a showing of
Disability, Cause, or Good Reason shall not waive any right of the Company or
the Executive hereunder or preclude the Company or the Executive from asserting
such fact or circumstance in enforcing the Company's or the Executive's rights
hereunder.

     (6) Date of Termination. For purposes of this Agreement, the "Date of
Termination" shall mean the effective date of termination of the Executive's
employment hereunder, which date shall be (i) if the Executive's employment is
terminated by the Executive's death, the date of the Executive's death, (ii) if
the Executive's employment is terminated because of the Executive's Disability,
the Disability Effective Date, (iii) if the Executive's employment is terminated
by the Company for Cause or by the Executive for Good Reason, the date on which
the Notice of Termination is given, (iv) if the Executive's employment is
terminated pursuant to Paragraph 2(a), the date on which the Employment Term
ends pursuant to Paragraph 2(a) due to a party's delivery of a Notice of
Termination thereunder, and (v) if the Executive's employment is terminated for
any other reason, the date specified in the Notice of Termination, which date
shall in no event be earlier than the date such notice is given; provided,
however, that if within 30 days after any Notice of Termination is given, the
party receiving such Notice of Termination notifies the other party that a
dispute exists concerning the termination, the Date of Termination shall be the
date on which the dispute is finally determined, either by mutual written
agreement of the parties or by a final judgment, order, or decree of a court of
competent jurisdiction (the time for appeal therefrom having expired and no
appeal having been perfected).

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     6. Obligations of the Company Upon Termination.

     (1) Good Reason or During the Window Period; Other Than for Cause, Death,
or Disability. If, during the Employment Term, the Company shall terminate the
Executive's employment hereunder other than for Cause or Disability or the
Executive shall terminate the Executive's employment either for Good Reason or
without any reason during the Window Period:

          (1) the Company shall pay to the Executive in a lump sum in cash
     within 30 days after the Date of Termination the aggregate of the following
     amounts:

               (1) the sum of (1) the Executive's Base Salary through the Date
          of Termination to the extent not theretofore paid, (2) the product of
          (x) the greater of (I) the Recent Annual Bonus and (II) the Annual
          Bonus paid or payable, including by reason of any deferral, to the
          Executive (and annualized for any fiscal year consisting of less than
          12 full months or for which the Executive has been employed by the
          Company for less than 12 full months) in respect of the most recently
          completed fiscal year of the Company during the Employment Term, if
          any (such greater amount hereinafter referred to as the "Highest
          Annual Bonus"), and (y) a fraction, the numerator of which is the
          number of days in the current fiscal year through the Date of
          Termination, and the denominator of which is 365, and (3) any
          compensation previously deferred by the Executive (together with any
          accrued interest or earnings thereon) and any accrued vacation pay, in
          each case to the extent not theretofore paid (the sum of the amounts
          described in clauses (1), (2), and (3) are hereinafter referred to as
          the "Accrued Obligations"); and

               (2) an amount (such amount is hereinafter referred to as the
          "Severance Amount") equal to the product of (1) three and (2) the sum
          of (x) the Executive's Base Salary and (y) the Highest Annual Bonus;
          and

               (3) a separate lump-sum supplemental retirement benefit (the
          amount of such benefit hereinafter referred to as the "Supplemental
          Retirement Amount") equal to the difference between (1) the actuarial
          equivalent (utilizing for this purpose the actuarial assumptions
          utilized with respect to the qualified defined benefit retirement plan
          of the Company and its affiliated companies in which the Executive is
          eligible to participate (or any successor plan thereto) (the
          "Retirement Plan") during the 120-day period immediately preceding the
          Effective Date) of the benefit payable under the Retirement Plan and
          any supplemental and/or excess retirement plan of the Company and its
          affiliated companies providing benefits for the Executive (the "SERP")
          which the Executive would receive if the Executive's employment
          continued at the compensation level provided for in Paragraphs 4(a)
          and 4(b)(i) for the remainder of the Employment Term, assuming for
          this purpose that all accrued benefits are fully vested and that
          benefit accrual formulas are no less advantageous to the Executive
          than those in effect during the 120-day period immediately preceding
          the Effective Date, and

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          (2) the actuarial equivalent (utilizing for this purpose the actuarial
          assumptions utilized with respect to the Retirement Plan during the
          120-day period immediately preceding the Effective Date) of the
          Executive's actual benefit (paid or payable), if any, under the
          Retirement Plan and the SERP; and

          (2) for three years after the Executives's Date of Termination, or
     such longer period as any plan, program, or arrangement may provide, the
     Company shall continue benefits to the Executive and/or the Executive's
     family at least equal to those that would have been provided to them in
     accordance with the plans, programs, and arrangements described in
     Paragraph 4(c)(ii) if the Executive's employment had not been terminated,
     in accordance with the most favorable plans, programs, and arrangements of
     the Company as in effect and applicable generally to the Executive's peer
     executives of the Company and its affiliated companies and their families
     during the 120-day period immediately preceding the Effective Date or, if
     more favorable to the Executive, as in effect generally at any time
     thereafter with respect to the Executive's peer executives of the Company
     and its affiliated companies and their families; provided, however, that if
     the Executive becomes reemployed with another employer and is eligible to
     receive medical or other welfare benefits under another employer provided
     plan, the medical and other welfare benefits described herein shall be
     secondary to those provided under such other plan during such applicable
     period of eligibility (such continuation of such benefits for the
     applicable period herein set forth is hereinafter referred to as "Welfare
     Benefit Continuation") (for purpose of determining eligibility of the
     Executive for retiree benefits pursuant to such plans, programs, and
     arrangements, the Executive shall be considered to have remained employed
     until three years after the Date of Termination and to have retired on the
     last day of such period); and

          (3) the Company shall, at its sole expense as incurred, provide the
     Executive with outplacement services the scope and provider of which shall
     be selected by the Executive in the Executive's sole discretion; and

          (4) with respect to all options to purchase Common Stock held by the
     Executive pursuant to a Company stock option plan on or prior to the Date
     of Termination, irrespective of whether such options are then exercisable,
     the Executive shall have the right, during the 60-day period after the Date
     of Termination, to elect to surrender all or part of such options in
     exchange for a cash payment by the Company to the Executive in an amount
     equal to the number of shares of Common Stock subject to the Executive's
     option multiplied by the excess of (x) over (y), where (x) equals the
     highest reported sale price of a share of Common Stock in any transaction
     reported on the New York Stock Exchange during the 60-day period prior to
     and including the Executive's Date of Termination and (y) equals the
     purchase price per share covered by the option. Such cash payments shall be
     made within 30 days after the date of the Executive's election; provided,
     however, that if the Executive's Date of Termination is within six months
     after the date of grant of a particular option held by the Executive and
     the Executive is subject to Section 16(b) of the Securities Exchange Act of
     1934, as amended (the "Exchange Act"), any cash payments related thereto
     shall be made on the date which is six months and one day after the date of
     grant of such option to the extent necessary to prevent the imposition of
     the disgorgement provisions under Section

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     16(b). Notwithstanding the foregoing, if any right granted pursuant to the
     foregoing would make any change of control transaction ineligible for
     pooling of interests accounting treatment under APB No. 16 that but for
     this Section 6(a)(iv) would otherwise be eligible for such accounting
     treatment, the Executive shall receive shares of Common Stock with a fair
     market value equal to the cash that would otherwise be payable hereunder in
     substitution for the cash, provided that any such shares of Common Stock so
     delivered to the Executive shall be registered under the Securities Act of
     1933, as amended; any options outstanding as of the Date of Termination and
     not then exercisable shall become fully exercisable as of the Executive's
     Date of Termination, and to the extent the Executive does not elect to
     surrender same for a cash payment (or the equivalent number of shares of
     Common Stock) as provided above, such options shall remain exercisable
     after the Executive's Date of Termination in accordance with the terms
     thereof; and restrictions applicable to any shares of Common Stock awarded
     to the Executive by the Company shall lapse, as of the date of the
     Executive's Date of Termination; and

          (5) all club memberships and other memberships that the Company was
     providing for the Executive's use at the time Notice of Termination is
     given shall, to the extent possible, be transferred and assigned to the
     Executive at no cost to the Executive (other than income taxes owed), the
     cost of transfer, if any, to be borne by the Company; and

          (6) all benefits under the Noble Drilling Corporation 1991 Stock
     Option and Restricted Stock Plan and any other similar plans, including any
     stock options or restricted stock held by the Executive, not already vested
     shall be 100% vested, to the extent such vesting is permitted under the
     Code; and

          (7) to the extent not theretofore paid or provided, the Company shall
     timely pay or provide to the Executive any other amounts or benefits
     required to be paid or provided or which the Executive is eligible to
     receive under any plan, program, policy, practice, or arrangement or
     contract or agreement of the Company and its affiliated companies (such
     other amounts and benefits hereinafter referred to as the "Other
     Benefits").

     (2) Death. If the Executive's employment is terminated by reason of the
Executive's death during the Employment Term, this Agreement shall terminate
without further obligations to the Executive's legal representatives under this
Agreement, other than for (i) payment of Accrued Obligations (which shall be
paid to the Executive's estate or beneficiary, as applicable, in a lump sum in
cash within 30 days of the Date of Termination) and the timely payment or
provision of the Welfare Benefit Continuation and the Other Benefits and (ii)
payment to the Executive's estate or beneficiaries, as applicable, in a lump sum
in cash within 30 days of the Date of Termination of an amount equal to the sum
of the Severance Amount and the Supplemental Retirement Amount. With respect to
the provision of Other Benefits, the term Other Benefits as used in this Section
6(b) shall include, without limitation, and the Executive's estate and/or
beneficiaries shall be entitled to receive, benefits at least equal to the most
favorable benefits provided by the Company and affiliated companies to the
estates and beneficiaries of peer executives of the Company and such affiliated
companies under such plans, programs, practices, and policies relating to death
benefits, if any, as in effect with respect to other peer executives and their
beneficiaries at any time during the 120-day

                                       10
<PAGE>   14

period immediately preceding the Effective Date or, if more favorable to the
Executive's estate and/or the Executive's beneficiaries, as in effect on the
date of the Executive's death with respect to other peer executives of the
Company and its affiliated companies and their beneficiaries.

     (3) Disability. If the Executive's employment is terminated by reason of
the Executive's Disability during the Employment Term, this Agreement shall
terminate without further obligations to the Executive, other than for (i)
payment of Accrued Obligations (which shall be paid to the Executive in a lump
sum in cash within 30 days of the Date of Termination) and the timely payment or
provision of the Welfare Benefit Continuation and the Other Benefits and (ii)
payment to the Executive in a lump sum in cash within 30 days of the Date of
Termination of an amount equal to the sum of the Severance Amount and the
Supplemental Retirement Amount. With respect to the provision of Other Benefits,
the term Other Benefits as used in this Section 6(c) shall include, without
limitation, and the Executive shall be entitled after the Disability Effective
Date to receive, disability and other benefits at least equal to the most
favorable of those generally provided by the Company and affiliated companies to
disabled executives and/or their families in accordance with such plans,
programs, practices, and policies relating to disability, if any, as in effect
generally with respect to other peer executives and their families at any time
during the 120-day period immediately preceding the Effective Date or, if more
favorable to the Executive and/or the Executive's family, as in effect at any
time thereafter generally with respect to other peer executives of the Company
and its affiliated companies and their families.

     (4) Cause; Other Than for Good Reason or During the Window Period. If the
Executive's employment is terminated for Cause during the Employment Term, this
Agreement shall terminate without further obligations to the Executive other
than the obligation to pay to the Executive Base Salary through the Date of
Termination plus the amount of any compensation previously deferred by the
Executive, in each case to the extent theretofore unpaid. If the Executive
voluntarily terminates the Executive's employment during the Employment Term,
excluding a termination either for Good Reason or without any reason during the
Window Period, this Agreement shall terminate without further obligations to the
Executive, other than for Accrued Obligations and the timely payment or
provision of the Other Benefits. In such case, all Accrued Obligations shall be
paid to the Executive in a lump sum in cash within 30 days of the Date of
Termination subject to applicable laws and regulations.

                                       11
<PAGE>   15

     7. Certain Additional Payments by the Company.

     (1) Notwithstanding any provision in this Agreement to the contrary and
except as set forth below, if it shall be determined that any payment or
distribution by the Company to or for the benefit of the Executive (whether paid
or payable or distributed or distributable pursuant to the terms of this
Agreement or otherwise, but determined without regard to any additional payments
required pursuant to this Paragraph 7) (a "Payment") would be subject to the
excise tax imposed by Section 4999 of the Code or any interest or penalties are
incurred by the Executive with respect to such excise tax (such excise tax,
together with any such interest and penalties, are hereinafter collectively
referred to as the "Excise Tax"), then the Executive shall be entitled to
receive an additional payment (a "Gross-Up Payment") in an amount such that
after payment by the Executive of all taxes (including any interest or penalties
imposed with respect to such taxes), including any income taxes (and any
interest and penalties imposed with respect thereto) and Excise Tax imposed upon
the Gross-Up Payment, the Executive retains an amount of the Gross-Up Payment
equal to the Excise Tax imposed upon the Payments. Notwithstanding the foregoing
provisions of this Paragraph 7(a), if it shall be determined that the Executive
is entitled to a Gross-Up Payment, but that the Executive, after taking into
account the Payments and the Gross-Up Payment, would not receive a net after-tax
benefit of at least $50,000 (taking into account both income taxes and any
Excise Tax) as compared to the net after-tax proceeds to the Executive resulting
from an elimination of the Gross-Up Payment and a reduction of the Payments, in
the aggregate, to an amount (the "Reduced Amount") such that the receipt of
payments would not give rise to any Excise Tax, then no Gross-Up Payment shall
be made to the Executive and the Payments, in the aggregate, shall be reduced to
the Reduced Amount.

     (2) Subject to the provisions of Paragraph 7(c), all determinations
required to be made under this Paragraph 7, including whether and when a
Gross-Up Payment is required and the amount of such Gross-Up Payment and the
assumptions to be utilized in arriving at such determination, shall be made by
PricewaterhouseCoopers (the "Accounting Firm") or, as provided below, such other
certified public accounting firm as may be designated by the Executive, which
shall provide detailed supporting calculations both to the Company and the
Executive within 15 business days after the receipt of notice from the Executive
that there has been a Payment, or such earlier time as is requested by the
Company. If the Accounting Firm is serving as accountant or auditor for the
individual, entity, or group effecting the Change of Control, the Executive
shall have the option, in the Executive's sole discretion, to appoint another
nationally recognized accounting firm to make the determinations required
hereunder (which accounting firm shall then be referred to as the Accounting
Firm hereunder). All fees and expenses of the Accounting Firm shall be borne
solely by the Company. Any Gross-Up Payment, as determined pursuant to this
Paragraph 7, shall be paid by the Company to the Executive within five days of
the receipt of the Accounting Firm's determination. If the Accounting Firm
determines that no Excise Tax is payable by the Executive, it shall furnish the
Executive with a written opinion that failure to report the Excise Tax on the
Executive's applicable federal income tax return would not result in the
imposition of a negligence or similar penalty. Any determination by the
Accounting Firm shall be binding upon the Company and the Executive. As a result
of the uncertainty in the application of Section 4999 of the Code at the time of
the initial determination by the Accounting Firm hereunder, it is possible that
Gross-Up Payments that will not have been made by the Company should have been
made ("Underpayment"), consistent with the calculations required to be made
hereunder. If the Company exhausts its

                                       12
<PAGE>   16

remedies pursuant to Paragraph 7(c) and the Executive thereafter is required to
make a payment of any Excise Tax, the Accounting Firm shall determine the amount
of the Underpayment that has occurred and any such Underpayment shall be
promptly paid by the Company to or for the benefit of the Executive.

     (3) The Executive shall notify the Company in writing of any claim by the
Internal Revenue Service that, if successful, would require the payment by the
Company of the Gross-Up Payment (or an additional amount of Gross-Up Payment) in
the event the Internal Revenue Service seeks higher payment. Such notification
shall be given as soon as practicable but no later than 10 business days after
the Executive is informed in writing of such claim and shall apprise the Company
of the nature of such claim and the date on which such claim is requested to be
paid. The Executive shall not pay such claim prior to the expiration of the
30-day period following the date on which it gives such notice to the Company
(or such shorter period ending on the date that any payment of taxes with
respect to such claim is due). If the Company notifies the Executive in writing
prior to the expiration of such period that it desires to contest such claim,
the Executive shall:

          (1) give the Company any information reasonably requested by the
     Company relating to such claim;

          (2) take such action in connection with contesting such claim as the
     Company shall reasonably request in writing from time to time, including
     the acceptance of legal representation with respect to such claim by an
     attorney reasonably selected by the Company;

          (3) cooperate with the Company in good faith in order effectively to
     contest such claim; and

          (4) permit the Company to participate in any proceedings relating to
     such claim;

provided, however, that the Company shall bear and pay directly all costs and
expenses (including additional interest and penalties) incurred in connection
with such contest and shall indemnify and hold the Executive harmless, on an
after-tax basis, for any Excise Tax or income tax (including interest and
penalties with respect thereto) imposed as a result of such representation and
payment of costs and expenses. Without limitation of the foregoing provisions of
this Paragraph 7(c), the Company shall control all proceedings taken in
connection with such contest and, at its sole option, may pursue or forgo any
and all administrative appeals, proceedings, hearings, and conferences with the
taxing authority in respect of such claim and may, at its sole option, either
direct the Executive to pay the tax claimed and sue for a refund or contest the
claim in any permissible manner, and the Executive agrees to prosecute such
contest to a determination before any administrative tribunal, in a court of
initial jurisdiction, and in one or more appellate courts, as the Company shall
determine; provided, however, that if the Company directs the Executive to pay
such claim and sue for a refund, the Company shall advance the amount of such
payment to the Executive, on an interest-free basis, and shall indemnify and
hold the Executive harmless, on an after-tax basis, from any Excise Tax or
income tax (including interest or penalties with respect thereto) imposed with
respect to such

                                       13
<PAGE>   17

advance or with respect to any imputed income with respect to such advance; and
provided further that any extension of the statute of limitations relating to
payment of taxes for the taxable year of the Executive with respect to which
such contested amount is claimed to be due is limited solely to such contested
amount. Furthermore, the Company's control of the contest shall be limited to
issues with respect to which a Gross-Up Payment would be payable hereunder and
the Executive shall be entitled to settle or contest, as the case may be, any
other issue raised by the Internal Revenue Service or any other taxing
authority.

     (d) If, after the receipt by the Executive of an amount advanced by the
Company pursuant to Paragraph 7(c), the Executive becomes entitled to receive
any refund with respect to such claim, the Executive shall (subject to the
Company's complying with the requirements of Paragraph 7(c)) promptly pay to the
Company the amount of such refund (together with any interest paid or credited
thereon after taxes applicable thereto). If, after the receipt by the Executive
of an amount advanced by the Company pursuant to Paragraph 7(c), a determination
is made that the Executive shall not be entitled to any refund with respect to
such claim and the Company does not notify the Executive in writing of its
intent to contest such denial of refund prior to the expiration of 30 days after
such determination, then such advance shall be forgiven and shall not be
required to be repaid and the amount of such advance shall offset, to the extent
thereof, the amount of Gross-Up Payment required to be paid.

     8. Representations and Warranties.

     (1) The Company represents and warrants to the Executive that the
execution, delivery, and performance by the Company of this Agreement have been
duly authorized by all necessary corporate action of the Company and do not and
will not conflict with or result in a violation of any provision of, or
constitute a default under, any contract, agreement, instrument, or obligation
to which the Company is a party or by which it is bound.

     (2) The Executive represents and warrants to the Company that the
execution, delivery, and performance by the Executive of this Agreement do not
and will not conflict with or result in a violation of any provision of, or
constitute a default under, any contract, agreement, instrument, or obligation
to which the Executive is a party or by which the Executive is bound.

     9. Confidential Information. The Executive recognizes and acknowledges that
the Company's trade secrets and other confidential or proprietary information,
as they may exist from time to time, are valuable, special, and unique assets of
the Company's business, access to and knowledge of which are essential to the
performance of the Executive's duties hereunder. The Executive confirms that all
such trade secrets and other information constitute the exclusive property of
the Company. During the Employment Term and thereafter without limitation of
time, the Executive shall hold in strict confidence and shall not, directly or
indirectly, disclose or reveal to any person, or use for the Executive's own
personal benefit or for the benefit of anyone else, any trade secrets,
confidential dealings, or other confidential or proprietary information of any
kind, nature, or description (whether or not acquired, learned, obtained, or
developed by the Executive alone or in conjunction with others) belonging to or
concerning the Company or any of its affiliated companies, except (i) with the
prior written consent of the Company duly authorized by its Board, (ii) in the
course of the proper performance of the Executive's duties hereunder, (iii) for
information

                                       14
<PAGE>   18

(x) that becomes generally available to the public other than as a result of
unauthorized disclosure by the Executive or the Executive's affiliates or (y)
that becomes available to the Executive on a nonconfidential basis from a source
other than the Company or its affiliated companies who is not bound by a duty of
confidentiality, or other contractual, legal, or fiduciary obligation, to the
Company, or (iv) as required by applicable law or legal process. The provisions
of this Paragraph 9 shall continue in effect notwithstanding termination of the
Executive's employment hereunder for any reason.

     10. Certain Definitions.

     (1) Effective Date. The "Effective Date" shall mean the first date during
the Change of Control Period (as defined in Paragraph 10(b)) on which a Change
of Control occurs. Notwithstanding anything in this Agreement to the contrary,
if a Change of Control occurs and if the Executive's employment with the Company
is terminated prior to the date on which the Change of Control occurs, and if it
is reasonably demonstrated by the Executive that such termination of employment
(i) was at the request of a third party who has taken steps reasonably
calculated to effect a Change of Control or (ii) otherwise arose in connection
with or anticipation of a Change of Control, then for all purposes of this
Agreement the "Effective Date" shall mean the date immediately prior to the date
of such termination of employment.

     (2) Change of Control Period. The "Change of Control Period" shall mean the
period commencing on the date of this Agreement and ending on the third
anniversary of such date; provided, however, that commencing on the date one
year after the date hereof, and on each annual anniversary of such date (such
date and each annual anniversary thereof herein referred to as the "Renewal
Date"), the Change of Control Period shall be automatically extended so as to
terminate three years after such Renewal Date, unless at least 60 days prior to
the Renewal Date the Company shall give notice to the Executive that the Change
of Control Period shall not be so extended.

     (3) Change of Control. For purposes of this Agreement, a "Change of
Control" shall mean:

          (1) the acquisition by any individual, entity, or group (within the
     meaning of Section 13(d)(3) or 14(d)(2) of the Exchange Act) (a "Person")
     of beneficial ownership (within the meaning of Rule 13d-3 promulgated under
     the Exchange Act) of 15% or more of either (A) the then outstanding shares
     of common stock of the Company (the "Outstanding Company Common Stock") or
     (B) the combined voting power of the then outstanding voting securities of
     the Company entitled to vote generally in the election of directors (the
     "Outstanding Company Voting Securities"); provided, however, that for
     purposes of this subparagraph (c)(i) the following acquisitions shall not
     constitute a Change of Control: (w) any acquisition directly from the
     Company (excluding an acquisition by virtue of the exercise of a conversion
     privilege), (x) any acquisition by the Company, (y) any acquisition by any
     employee benefit plan (or related trust) sponsored or maintained by the
     Company or any corporation controlled by the Company, or (z) any
     acquisition by any corporation pursuant to a reorganization, merger, or
     consolidation, if, following such reorganization,

                                       15
<PAGE>   19

     merger, or consolidation, the conditions described in clauses (A), (B), and
     (C) of subparagraph (iii) of this Paragraph 10 (c) are satisfied; or

          (2) individuals who, as of the date of this Agreement, constitute the
     Board (the "Incumbent Board") cease for any reason to constitute a majority
     of the Board; provided, however, that any individual becoming a director
     subsequent to the date hereof whose election, or nomination for election by
     the Company's stockholders, was approved by a vote of a majority of the
     directors then comprising the Incumbent Board shall be considered as though
     such individual were a member of the Incumbent Board, but excluding, for
     this purpose, any such individual whose initial assumption of office occurs
     as a result of either an actual or threatened election contest or other
     actual or threatened solicitation of proxies or consents by or on behalf of
     a Person other than the Board; or

          (3) consummation of a reorganization, merger, or consolidation of the
     Company, with or without approval by the stockholders of the Company, in
     each case, unless, following such reorganization, merger, or consolidation,
     (A) more than 50% of, respectively, the then outstanding shares of common
     stock of the corporation resulting from such reorganization, merger, or
     consolidation and the combined voting power of the then outstanding voting
     securities of such corporation entitled to vote generally in the election
     of directors is then beneficially owned, directly or indirectly, by all or
     substantially all of the individuals and entities who were the beneficial
     owners, respectively, of the Outstanding Company Common Stock and
     Outstanding Company Voting Securities immediately prior to such
     reorganization, merger, or consolidation in substantially the same
     proportions as their ownership, immediately prior to such reorganization,
     merger, or consolidation, of the Outstanding Company Common Stock and
     Outstanding Company Voting Securities, as the case may be, (B) no Person
     (excluding the Company, any employee benefit plan (or related trust) of the
     Company or such corporation resulting from such reorganization, merger, or
     consolidation, and any Person beneficially owning, immediately prior to
     such reorganization, merger, or consolidation, directly or indirectly, 15%
     or more of the Outstanding Company Common Stock or Outstanding Company
     Voting Securities, as the case may be) beneficially owns, directly or
     indirectly, 15% or more of, respectively, the then outstanding shares of
     common stock of the corporation resulting from such reorganization, merger,
     or consolidation or the combined voting power of the then outstanding
     voting securities of such corporation entitled to vote generally in the
     election of directors, and (C) a majority of the members of the board of
     directors of the corporation resulting from such reorganization, merger, or
     consolidation were members of the Incumbent Board at the time of the
     execution of the initial agreement providing for such reorganization,
     merger, or consolidation; or

          (4) consummation of a sale or other disposition of all or
     substantially all the assets of the Company, with or without approval by
     the stockholders of the Company, other than to a corporation, with respect
     to which following such sale or other disposition, (A) more than 50% of,
     respectively, the then outstanding shares of common stock of such
     corporation and the combined voting power of the then outstanding voting
     securities of such corporation entitled to vote generally in the election
     of directors is then beneficially owned, directly or indirectly, by all or
     substantially all the individuals and entities who were the

                                       16
<PAGE>   20

     beneficial owners, respectively, of the Outstanding Company Common Stock
     and Outstanding Company Voting Securities immediately prior to such sale or
     other disposition in substantially the same proportion as their ownership,
     immediately prior to such sale or other disposition, of the Outstanding
     Company Common Stock and Outstanding Company Voting Securities, as the case
     may be, (B) no Person (excluding the Company, any employee benefit plan (or
     related trust) of the Company or such corporation, and any Person
     beneficially owning, immediately prior to such sale or other disposition,
     directly or indirectly, 15% or more of the Outstanding Company Common Stock
     or Outstanding Company Voting Securities, as the case may be) beneficially
     owns, directly or indirectly, 15% or more of, respectively, the then
     outstanding shares of common stock of such corporation or the combined
     voting power of the then outstanding voting securities of such corporation
     entitled to vote generally in the election of directors, and (C) a majority
     of the members of the board of directors of such corporation were members
     of the Incumbent Board at the time of the execution of the initial
     agreement or action of the Board providing for such sale or other
     disposition of assets of the Company; or

          (5) approval by the stockholders of the Company of a complete
     liquidation or dissolution of the Company.

     11. Full Settlement.

     (1) There shall be no right of set off or counterclaim against, or delay
in, any payments to the Executive, or to the Executive's heirs or legal
representatives, provided for in this Agreement, in respect of any claim against
or debt or other obligation of the Executive or others, whether arising
hereunder or otherwise.

     (2) In no event shall the Executive be obligated to seek other employment
or take any other action by way of mitigation of the amounts payable to the
Executive under any of the provisions of this Agreement, and such amounts shall
not be reduced whether or not the Executive obtains other employment.

     (3) The Company agrees to pay as incurred, to the full extent permitted by
law, all costs and expenses (including attorneys' fees) that the Executive, or
the Executive's heirs or legal representatives, may reasonably incur as a result
of any contest (regardless of the outcome thereof) by the Company, the
Executive, or others of the validity or enforceability of, or liability under,
any provision of this Agreement, or any guarantee of performance thereof
(including as a result of any contest by the Executive, or the Executive's heirs
or legal representatives, about the amount of any payment pursuant to this
Agreement), plus in each case interest on any delayed payment at the applicable
federal rate provided for in Section 7872(f)(2) of the Code.

                                       17
<PAGE>   21
     12. No Effect on Other Contractual Rights. The provisions of this
Agreement, and any payment provided for hereunder, shall not reduce any amounts
otherwise payable to the Executive, or in any way diminish the Executive's
rights as an employee of the Company, whether existing on the date of this
Agreement or hereafter, under any employee benefit plan, program, or arrangement
or other contract or agreement of the Company providing benefits to the
Executive.

     13. Indemnification; Directors and Officers Insurance. The Company shall
(a) during the Employment Term and thereafter without limitation of time,
indemnify and advance expenses to the Executive to the fullest extent permitted
by the laws of the State of Delaware from time to time in effect and (b) during
the Employment Term, acquire and maintain directors and officers liability
insurance covering the Executive (and to the extent the Company desires, other
directors and officers of the Company and its affiliated companies) to the
extent it is available at commercially reasonable rates as determined by the
Board; provided, however, that in no event shall the Executive be entitled to
indemnification or advancement of expenses under this Paragraph 13 with respect
to any proceeding, or matter therein, brought or made by the Executive against
the Company other than one initiated by the Executive to enforce the Executive's
rights under this Paragraph 13. The rights of indemnification and to receive
advancement of expenses as provided in this Paragraph 13 shall not be deemed
exclusive of any other rights to which the Executive may at any time be entitled
under applicable law, the certificate of incorporation or bylaws of the Company,
any agreement, a vote of stockholders, a resolution of the Board, or otherwise.
The provisions of this Paragraph 13 shall continue in effect notwithstanding
termination of the Executive's employment hereunder for any reason.

     14. Injunctive Relief. In recognition of the fact that a breach by the
Executive of any of the provisions of Paragraph 9 will cause irreparable damage
to the Company for which monetary damages alone will not constitute an adequate
remedy, the Company shall be entitled as a matter of right (without being
required to prove damages or furnish any bond or other security) to obtain a
restraining order, an injunction, an order of specific performance, or other
equitable or extraordinary relief from any court of competent jurisdiction
restraining any further violation of such provisions by the Executive or
requiring the Executive to perform the Executive's obligations hereunder. Such
right to equitable or extraordinary relief shall not be exclusive but shall be
in addition to all other rights and remedies to which the Company may be
entitled at law or in equity, including without limitation the right to recover
monetary damages for the breach by the Executive of any of the provisions of
this Agreement.

     15. Governing Law. This Agreement shall be governed by and construed and
enforced in accordance with the laws of the State of Texas, without regard to
the principles of conflicts of laws thereof.

     16. Notices. All notices, requests, demands, and other communications
required or permitted to be given or made hereunder by either party hereto shall
be in writing and shall be deemed to have been duly given or made (i) when
delivered personally, (ii) when sent by telefacsimile transmission, or (iii)
five days after being deposited in the United States mail, first class
registered or certified mail, postage prepaid, return receipt requested, to the
party for which intended at the following addresses (or at such other addresses
as shall be specified by the parties by like notice, except that notices of
change of address shall be effective only upon receipt):

                                       18
<PAGE>   22

         If to the Company, at:    Noble Drilling Corporation
                                   13135 S. Dairy Ashford, Suite 800
                                   Sugar Land, Texas  77478
                                   Fax No.: 281-491-2092
                                   Attention: Chief Executive Officer

         If to the Executive, at:  Mark A. Jackson
                                   13135 S. Dairy Ashford, Suite 800
                                   Sugar Land, Texas  77478
                                   Fax No.: 281-276-6336

     17. Binding Effect; Assignment; No Third Party Benefit.

     (1) This Agreement is personal to the Executive and without the prior
written consent of the Company shall not be assignable by the Executive
otherwise than by will or the laws of descent and distribution. This Agreement
shall inure to the benefit of and shall be enforceable by the Executive's legal
representatives.

     (2) This Agreement shall inure to the benefit of and be binding upon the
Company and its successors and assigns.

     (3) The Company shall require any successor or assign (whether direct or
indirect, by purchase, merger, consolidation, or otherwise) to all or
substantially all the business and/or assets of the Company, by agreement in
writing in form and substance reasonably satisfactory to the Executive,
expressly, absolutely, and unconditionally to assume and agree to perform this
Agreement in the same manner and to the same extent that the Company would be
required to perform it if no such succession or assignment had taken place. As
used in this Agreement, the "Company" shall mean the Company as hereinbefore
defined and any successor or assign to its business and/or assets as aforesaid
which executes and delivers the agreement provided for in this Paragraph 17(c)
or which otherwise becomes bound by all the terms and provisions of this
Agreement by operation of law.

     (4) Nothing in this Agreement, express or implied, is intended to or shall
confer upon any person other than the parties hereto, and their respective
heirs, legal representatives, successors, and permitted assigns, any rights,
benefits, or remedies of any nature whatsoever under or by reason of this
Agreement.

     18. Miscellaneous.

     (1) Amendment. This Agreement may not be modified or amended in any respect
except by an instrument in writing signed by the party against whom such
modification or amendment is sought to be enforced. No person, other than
pursuant to a resolution of the Board or a committee thereof, shall have
authority on behalf of the Company to agree to modify, amend, or waive any
provision of this Agreement or anything in reference thereto.

     (2) Waiver. Any term or condition of this Agreement may be waived at any
time by the party hereto which is entitled to have the benefit thereof, but such
waiver shall only be effective if evidenced by a writing signed by such party,
and a waiver on one occasion shall not be deemed to be a waiver of the same or
any other type of breach on a future occasion. No failure or delay by a party
hereto in exercising any right or power hereunder shall operate as a waiver
thereof nor shall any single or partial exercise thereof preclude any other or
further exercise thereof or the exercise of any other right or power.

                                       19
<PAGE>   23

     (3) Withholding Taxes. The Company may withhold from any amounts payable
under this Agreement such federal, state, local, or foreign taxes as shall be
required to be withheld pursuant to any applicable law or regulation.

     (4) Nonalienation of Benefits. The Executive shall not have any right to
pledge, hypothecate, anticipate, or in any way create a lien upon any payments
or other benefits provided under this Agreement; and no benefits payable
hereunder shall be assignable in anticipation of payment either by voluntary or
involuntary acts, or by operation of law, except by will or pursuant to the laws
of descent and distribution.

     (5) Severability. If any provision of this Agreement is held to be invalid
or unenforceable, (a) this Agreement shall be considered divisible, (b) such
provision shall be deemed inoperative to the extent it is deemed invalid or
unenforceable, and (c) in all other respects this Agreement shall remain in full
force and effect; provided, however, that if any such provision may be made
valid or enforceable by limitation thereof, then such provision shall be deemed
to be so limited and shall be valid and/or enforceable to the maximum extent
permitted by applicable law.

     (6) Entire Agreement. This Agreement constitutes the entire agreement
between the parties hereto concerning the subject matter hereof, and from and
after the date of this Agreement, this Agreement shall supersede any other prior
agreement or understanding, both written and oral, between the parties with
respect to such subject matter.

     (7) Captions. The captions herein are inserted for convenience of reference
only, do not constitute a part of this Agreement, and shall not affect in any
manner the meaning or interpretation of this Agreement.

     (8) References. All references in this Agreement to Paragraphs,
subparagraphs, and other subdivisions refer to the Paragraphs, subparagraphs,
and other subdivisions of this Agreement unless expressly provided otherwise.
The words "this Agreement", "herein", "hereof", "hereby", "hereunder", and words
of similar import refer to this Agreement as a whole and not to any particular
subdivision unless expressly so limited. Whenever the words "include",
"includes", and "including" are used in this Agreement, such words shall be
deemed to be followed by the words "without limitation". Words in the singular
form shall be construed to include the plural and vice versa, unless the context
otherwise requires.

                                       20
<PAGE>   24

     IN WITNESS WHEREOF, the Company has caused this Agreement to be executed on
its behalf by its duly authorized officer, and the Executive has executed this
Agreement, as of the date first above set forth.

                           NOBLE DRILLING CORPORATION

                           By:   /s/ JAMES C. DAY
                              -------------------------------------------------
                                Name:      James C. Day
                                Title:     Chairman and Chief Executive Officer

                                                                      "COMPANY"

                                 /s/ MARK A. JACKSON
                                -----------------------------------------------
                                 Mark A. Jackson

                                                                    "EXECUTIVE"

                                       21<PAGE>

                                                                     EXHIBIT 4.1

                          AMBAC FINANCIAL GROUP, INC.

                                      TO

                           FIRST UNION NATIONAL BANK

                                    Trustee

                                 ------------

                                   INDENTURE

                          Dated as of March 15, 2001

                                 ------------

RECONCILIATION AND TIE BETWEEN TRUST INDENTURE ACT OF 1939, AS AMENDED, AND
INDENTURE, DATED AS OF MARCH 15, 2001.
<TABLE>
<CAPTION>

TRUST INDENTURE                                    INDENTURE
ACT SECTION                                         SECTION
<S>                                                <C>
Section 310(a)(1).................................    607
           (a)(2).................................    607
           (b)....................................    608
Section 312(a)....................................    703
</TABLE>
<PAGE>

<TABLE>
<CAPTION>
TRUST INDENTURE                                   INDENTURE
ACT SECTION                                        SECTION
<S>                                               <C>
Section 312(c)...................................    701
Section 313(a)...................................    702
Section 314(a)...................................    703
           (c)(1)................................    102
           (c)(2)................................    102
           (e)...................................    102
Section 315(b)...................................    601
Section 316(a)...................................    101
                                                     ("Outstanding")
           (a)(l)(A).............................    502
                                                     512
           (a)(l)(B).............................    513
           (b)...................................    508
Section 317(a)(1)................................    503
           (a)(2)................................    504
Section 318(a)...................................    111
</TABLE>
------------------

NOTE:   THIS RECONCILIATION AND TIE SHALL NOT, FOR ANY PURPOSE, BE
        DEEMED TO BE A PART OF THIS INDENTURE.

                             TABLE OF CONTENTS(1)
<TABLE>
<CAPTION>
                                                                       PAGE
                                                                       ----
<S>                                                                    <C>
  RECITALS OF THE COMPANY.............................................   1
  DEFINITIONS AND OTHER PROVISIONS OF GENERAL APPLICATION.............   1
  SECTION 101.  DEFINITIONS...........................................   1
  Act.................................................................   2
  Affiliate...........................................................   2
  Authenticating Agent................................................   2
  Board of Directors..................................................   2
  Board Resolution....................................................   2
  Business Day........................................................   2
  Commission..........................................................   2
  Company ............................................................   2
  Company Request or Company Order....................................   3
  Corporate Trust Office..............................................   3
  Corporation.........................................................   3
  Currency............................................................   3
  Defaulted Interest..................................................   3
  Depositary..........................................................   3
  Dollar or $.........................................................   3
  ECU.................................................................   3
  Exchange Rate Agent.................................................   3
  Event of Default....................................................   3
  Global Security.....................................................   3
  Holder..............................................................   4
  Indenture...........................................................   4
  Interest Payment Date...............................................   4
  Maturity............................................................   4
  Mortgage............................................................   4
  Officers' Certificates..............................................   4
  Opinion of Counsel..................................................   4
  Original Issue Discount Security....................................   4
</TABLE>
<PAGE>

<TABLE>
<CAPTION>
                                                                       PAGE
                                                                       ----
<S>                                                                    <C>
  Outstanding.........................................................   4
  Paying Agent........................................................   5
  Person..............................................................   5
  Place of Payment....................................................   5
  Predecessor Security................................................   5
  Redemption Date.....................................................   6
  Redemption Price....................................................   6
  Regular Record Date.................................................   6
  Responsible Officer.................................................   6
  Restricted Subsidiary...............................................   6
  Securities..........................................................   6
  Security Register and Security Registrar............................   6
  Special Record Date.................................................   6
  Stated Maturity.....................................................   6
  Subsidiary..........................................................   7
  Trustee ............................................................   7
  Trust Indenture Act.................................................   7
  U.S. Government Obligations.........................................   7
  Vice President......................................................   7
  Voting Stock........................................................   7
  SECTION 102.  Compliance Certificates and Opinions..................   7
  SECTION 103.  Form of Documents Delivered to Trustee................   8
  SECTION 104.  Acts of Holders.......................................   9
  SECTION 105.  Notices, Etc., to Trustee and Company.................   9
  SECTION 106.  Notice to Holders; Waiver............................   10
  SECTION 107.  Effect of Headings and Table of Contents.............   10
  SECTION 108.  Successors and Assigns...............................   10
  SECTION 109.  Separability Clause..................................   11
  SECTION 110.  Benefits of Indenture................................   11
  SECTION 111.  Governing Law........................................   11
  SECTION 112.  Legal Holidays.......................................   11

ARTICLE TWO

  SECURITY FORMS.....................................................   11
  SECTION 201.  Forms Generally......................................   11
  SECTION 202.  Additional Provisions in Global Securities...........   12
  SECTION 203.  Form of Trustee's Certificate of Authentication......   13

ARTICLE THREE

  THE SECURITIES.....................................................   13
  SECTION 301.  Amount Unlimited; Issuable in Series.................   13
  SECTION 302.  Denominations........................................   15
  SECTION 303.  Execution, Authentication, Delivery and Dating.......   15
  SECTION 304.  Temporary Securities.................................   17
  SECTION 305.  Registration, Registration of Transfer and
                  Exchange...........................................   18
  SECTION 306.  Mutilated, Destroyed, Lost and Stolen Securities.....   19
  SECTION 307.  Payment of Interest; Interest Rights Preserved.......   20
  SECTION 308.  Persons Deemed Owners................................   22
  SECTION 309.  Cancellation.........................................   22
  SECTION 310.  Computation of Interest..............................   23

ARTICLE FOUR

  SATISFACTION AND DISCHARGE.........................................   23
  SECTION 401.  Satisfaction and Discharge of Indenture..............   23
  SECTION 402.  Application of Trust Money...........................   24
</TABLE>
<PAGE>

<TABLE>
<CAPTION>
                                                                       PAGE
                                                                       ----
<S>                                                                    <C>
ARTICLE FIVE

  REMEDIES...........................................................    24
  SECTION 501.  Events of Default....................................    24
  SECTION 502.  Acceleration of Maturity; Rescission and
                   Annulment.........................................    26
  SECTION 503.  Collection of Indebtedness and Suits for
                   Enforcement by Trustee............................    28
  SECTION 504.  Trustee May File Proofs of Claim.....................    28
  SECTION 505.  Trustee May Enforce Claims Without Possession
                   of Securities.....................................    29
  SECTION 506.  Application of Money Collected.......................    30
  SECTION 507.  Limitation on Suits..................................    30
  SECTION 508.  Unconditional Right of Holders to Receive
                   Principal, Premium and Interest...................    31
  SECTION 509.  Restoration of Rights and Remedies...................    31
  SECTION 510.  Rights and Remedies Cumulative.......................    32
  SECTION 511.  Delay or Omission Not Waiver.........................    32
  SECTION 512.  Control by Holders...................................    32
  SECTION 513.  Waiver of Past Defaults..............................    33
  SECTION 514.  Waiver of Stay or Extension Laws.....................    33

ARTICLE  SIX

  THE TRUSTEE........................................................    34
  SECTION 601.  Notice of Defaults...................................    34
  SECTION 602.  Certain Rights of Trustee............................    34
  SECTION 603.  Not Responsible for Recitals or Issuance
                   of Securities.....................................    35
  SECTION 604.  May Hold Securities..................................    35
  SECTION 605.  Money Held in Trust..................................    36
  SECTION 606.  Compensation and Reimbursement.......................    36
  SECTION 607.  Corporate Trustee Required; Eligibility..............    36
  SECTION 608.  Resignation and Removal; Appointment of Successor....    37
  SECTION 609.  Acceptance of Appointment by Successor...............    38
  SECTION 610.  Merger, Conversion, Consolidation or Succession
                   to Business.......................................    40
  SECTION 611.  Appointment of Authenticating Agent..................    40

ARTICLE SEVEN

  HOLDERS' LISTS AND REPORTS BY TRUSTEE AND COMPANY..................    42
  SECTION 701.  Disclosure of Names and Addresses of Holders.........    42
  SECTION 702.  Reports by Trustee...................................    42
  SECTION 703.  Reports by Company and Holders' Lists................    42

ARTICLE EIGHT

  CONSOLIDATION, MERGER, CONVEYANCE, TRANSFER OR LEASE...............    44
  SECTION 801.  Company May Consolidate, Etc., Only on Certain
                   Terms.............................................    44
  SECTION 802.  Successor Corporation Substituted....................    44

ARTICLE NINE

  SUPPLEMENTAL INDENTURES............................................    45
  SECTION 901.  Supplemental Indentures Without Consent of Holders...    45
  SECTION 902.  Supplemental Indentures with Consent of Holders......    46
</TABLE>
<PAGE>

<TABLE>
<CAPTION>
                                                                        PAGE
                                                                        ----
<S>                                                                     <C>
  SECTION 903.  Execution of Supplemental Indentures.................    47
  SECTION 904.  Effect of Supplemental Indentures....................    47
  SECTION 905.  Conformity with Trust Indenture Act..................    48
  SECTION 906.  Reference in Securities to Supplemental Indentures...    48

ARTICLE TEN

  COVENANTS..........................................................    48
  SECTION 1001. Payment of Principal, Premium and Interest...........    48
  SECTION 1002. Maintenance of Office or Agency......................    48
  SECTION 1003. Money for Securities Payments to Be Held in Trust....    49
  SECTION 1004. Corporate Existence..................................    51
  SECTION 1005. Maintenance of Properties............................    51
  SECTION 1006. Payment of Taxes and Other Claims....................    51
  SECTION 1007. Limitations on Liens.................................    51
  SECTION 1008. Limitations on Disposition of Stock of Restricted
                  Subsidiaries.......................................    52
  SECTION 1009. Statement as to Compliance...........................    52
  SECTION 1010. Waiver of Certain Covenants..........................    52

ARTICLE ELEVEN

  REDEMPTION OF SECURITIES...........................................    53
  SECTION 1101. Applicability of Article.............................    53
  SECTION 1102. Election to Redeem; Notice to Trustee................    53
  SECTION 1103. Selection by Trustee of Securities to Be Redeemed....    53
  SECTION 1104. Notice of Redemption.................................    54
  SECTION 1105. Deposit of Redemption Price..........................    54
  SECTION 1106. Securities Payable on Redemption Date................    55
  SECTION 1107. Securities Redeemed in Part..........................    55

ARTICLE TWELVE

  SINKING FUNDS......................................................    56
  SECTION 1201. Applicability of Article.............................    56
  SECTION 1202. Satisfaction of Sinking Fund Payments with
                   Securities........................................    56
  SECTION 1203. Redemption of Securities for Sinking Fund............    56

ARTICLE THIRTEEN

  REPAYMENT AT OPTION OF HOLDERS.....................................    58
  SECTION 1301. Applicability of Article.............................    58
  SECTION 1302. Repayment of Securities..............................    58
  SECTION 1303. Exercise of Option...................................    58
  SECTION 1304. When Securities Presented for Repayment Become
                   Due and Payable...................................    59
  SECTION 1305. Securities Repaid in Part............................    59

ARTICLE FOURTEEN

  DEFEASANCE AND COVENANT DEFEASANCE.................................    60
  SECTION 1401. Applicability of Article; Company's Option to
                   Effect Defeasance or..............................    60
  SECTION 1402. Defeasance and Discharge.............................    60
  SECTION 1403. Covenant Defeasance..................................    60
  SECTION 1404. Conditions to Defeasance or Covenant Defeasance......    61
  SECTION 1405. Application of Trust Money...........................    63
</TABLE>
<PAGE>

--------

  1  This table of contents shall not, for any purpose, be deemed to be
     a part of the Indenture.

   INDENTURE, dated as of March 15, 2001, between Ambac Financial Group,
Inc., a corporation duly organized and existing under the laws of the State
of Delaware (the "Company"), having its principal office at One State Street
Plaza, New York, New York 10004, and First Union National Bank, a national
banking association incorporated and existing under the laws of the United
States of America, as Trustee (the "Trustee").

                            RECITALS OF THE COMPANY

   The Company has duly authorized the execution and delivery of this
Indenture to provide for the issuance from time to time of its unsecured
debentures, notes or other evidences of indebtedness (the "Securities"), to
be issued in one or more series as in this Indenture provided.

   This Indenture is subject to the provisions of the Trust Indenture
Act of 1939, as amended, that are required to be part of this Indenture and
shall, to the extent applicable, be governed by such provisions.

   All things necessary to make this Indenture a valid agreement of
the Company, in accordance with its terms, have been done.

   NOW, THEREFORE, the Company agrees as follows with the Trustee for
the equal and proportionate benefit of all Holders of the Securities or of
series thereof:

                                  ARTICLE ONE

                       DEFINITIONS AND OTHER PROVISIONS
                            OF GENERAL APPLICATION

SECTION 101.  DEFINITIONS.

  For all purposes of this Indenture, except as otherwise expressly
provided or unless the context otherwise requires:

    (1) the terms defined in this Section have the meanings
  assigned to them in this Section and include the plural as well as the
  singular;

    (2) all other terms used herein which are defined in the Trust
  Indenture Act, either directly or by reference therein, have the
  meanings assigned to them therein;

    (3) all accounting terms not otherwise defined herein have the
  meanings assigned to them in accordance with United States generally
  accepted accounting principles, and, except as otherwise herein
  expressly provided, the term "generally accepted accounting
  principles" with respect to any computation required or permitted
  hereunder shall mean such accounting principles are generally accepted
  at the date of such computation; and

    (4) the words "herein," "hereof," and "hereunder" and other
<PAGE>

  words of similar import refer to this Indenture as a whole and not to
  any particular Article, Section or other subdivision.

   Certain terms, used principally in Article Six, are defined in that Article.

   "Act," when used with respect to any Holder, has the meaning specified in
Section 104.

   "Affiliate" of any specified Person means any other Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with such specified Person. For the purposes of this definition,
"control" when used with respect to any specified Person means the power to
direct the management and policies of such Person, directly or indirectly,
whether through the ownership of voting securities, by contract or otherwise;
and the terms "controlling" and "controlled" have meanings correlative to the
foregoing.

   "Authenticating Agent" means any Person authorized by the Trustee to act on
behalf of the Trustee to authenticate Securities.

   "Board of Directors" means either the board of directors of the Company or
any duly authorized committee of that board.

   "Board Resolution" means a copy of a resolution certified by the Secretary or
an Assistant Secretary of the Company to have been duly adopted by the Board of
Directors and to be in full force and effect on the date of such certification,
and delivered to the Trustee.

   "Business Day", except as otherwise specified as contemplated by Section 301,
when used with respect to any Place of Payment, means each Monday, Tuesday,
Wednesday, Thursday and Friday which is not a day on which banking institutions
in that Place of Payment are generally authorized or obligated by law to close.

   "Commission" means the Securities and Exchange Commission, as from time to
time constituted, created under the Securities Exchange Act of 1934, or, if at
any time after the execution of this instrument such Commission is not existing
and performing the duties now assigned to it under the Trust Indenture Act, then
the body performing such duties at such time.

   "Company" means the Person named as the "Company" in the first paragraph of
this instrument until a successor corporation shall have become such pursuant to
the applicable provisions of this Indenture, and thereafter "Company" shall mean
such successor corporation.

   "Company Request" or "Company Order" means a written request or order signed
in the name of the Company by its Chairman of the Board, President or a Vice
President, and by its Treasurer, an Assistant Treasurer, Secretary or an
Assistant Secretary, and delivered to the Trustee.

   "Corporate Trust Office" means the office of the Trustee in the City of
Newark, New Jersey at which at any particular time its corporate trust business
shall be administered.

   "Corporation" includes corporations, associations, companies and business
trusts.
<PAGE>

   "Currency" means any currency or currencies, composite currency or currency
unit or currency units, including, without limitation, the ECU, issued by the
government of one or more countries or by any recognized confederation or
association of such governments.

   "Defaulted Interest" has the meaning specified in Section 307.

   "Depositary" means, with respect to the Securities of any series issuable or
issued in whole or in part in the form of one or more Global Securities, the
Person designated as Depositary by the Company pursuant to Section 301, and if
at any time there is more than one such Person, 'Depositary' as used with
respect to the Securities of any such series shall mean the Depositary with
respect to the Securities of that series.

   "Dollar" or "$" means a dollar or other equivalent unit in such coin or
currency of the United States of America as at the time shall be legal tender
for the payment of public and private debts.

   "ECU" means the European Currency Unit as defined and revised from time to
time by the Council of European Communities.

   "Exchange Rate Agent" means a New York Clearinghouse Bank retained for the
purpose of quoting the exchange rate on any day between Dollars and any
Currency, or between any two Currencies.

   "Event of Default" has the meaning specified in Section 501.

   "Global Security" means a Security issued to evidence all or a part of any
series of Securities which is executed by the Company and authenticated and
delivered by the Trustee to the Depositary or pursuant to the Depositary's
instruction, all in accordance with this Indenture and pursuant to a Company
Order, which shall be registered in the name of the Depositary or its nominee.

   "Holder" means a Person in whose name a Security is registered in the
Security Register.

   "Indenture" means this instrument as originally executed or as it may from
time to time be supplemented or amended by one or more indentures supplemental
hereto entered into pursuant to the applicable provisions hereof and shall
include the terms of particular series of Securities established as contemplated
by Section 301.

   "Interest Payment Date," when used with respect to any Security, means the
Stated Maturity of an installment of interest of such Security.

   "Maturity," when used with respect to any security, means the date on which
the principal of such Security or an installment of principal becomes due and
payable as therein or herein provided, whether at the Stated Maturity or by
declaration of acceleration, call for redemption or otherwise.

   "Mortgage" means any mortgage, pledge, lien, security interest or other
encumbrance.

   "Officers' Certificates" means a certificate signed by the Chairman of the
Board, President or a Vice President, and by the Treasurer, an
<PAGE>

Assistant Treasurer, Secretary or an Assistant Secretary, of the Company,
and delivered to the Trustee.

   "Opinion of Counsel" means a written opinion of counsel, who may be counsel
for the Company.

   "Original Issue Discount Security" means any Security which provides for an
amount less than the principal amount thereof to be due and payable upon a
declaration of acceleration of the Maturity thereof pursuant to Section 502.

   "Outstanding," when used with respect to Securities, means, as of the date of
determination, all Securities theretofore authenticated and delivered under this
Indenture, except:

       (i)   Securities theretofore cancelled by the Trustee or delivered to the
  Trustee for cancellation;

       (ii)  Securities for the payment or redemption of which money or U.S.
  Government Obligations in the necessary amount has been theretofore deposited
  with the Trustee or any Paying Agent (other than the Company) in trust or set
  aside and segregated in trust by the Company (if the Company shall act as its
  own Paying Agent) for the Holders of such Securities as contemplated by
  Article Four or Article Fourteen; provided that, if such Securities are to be
  redeemed, notice of such redemption has been duly given pursuant to this
  Indenture or provision therefor satisfactory to the Trustee has been made; and

       (iii) Securities which have been paid pursuant to Section 306 or in
  exchange for or in lieu of which other Securities have been authenticated and
  delivered pursuant to this Indenture, other than any such Securities in
  respect of which there shall have been presented to the Trustee proof
  satisfactory to it that such Securities are held by a bona fide purchaser in
  whose hands such Securities are valid obligations of the Company;

provided, however, that in determining whether the Holders of the requisite
principal amount of the Outstanding Securities have given any request, demand,
authorization, direction, notice, consent or waiver hereunder, (a) the principal
amount of an Original Issue Discount Security that shall be deemed to be
Outstanding shall be the amount of the principal thereof that would be due and
payable as of the date of such determination upon acceleration of the Maturity
thereof pursuant to Section 502, and (b) Securities owned by the Company or any
other obligor upon the Securities or any Affiliate of the Company or of such
other obligor shall be disregarded and deemed not to be Outstanding, except
that, in determining whether the Trustee shall be protected in relying upon any
such request, demand, authorization, direction, notice, consent or waiver, only
Securities which the Trustee knows to be so owned shall be so disregarded.
Securities so owned which have been pledged in good faith may be regarded as
Outstanding if the pledgee establishes to the satisfaction of the Trustee the
pledgee's right so to act with respect to such Securities and that the pledgee
is not the Company or any other obligor upon the Securities or any Affiliate of
the Company or of such other obligor.

   "Paying Agent" means any Person authorized by the Company to pay the
principal of (and premium, if any) or interest on any Securities on behalf of
the Company.
<PAGE>

   "Person" means any individual, corporation, partnership, joint
venture, association, joint-stock company, trust, unincorporated
organization or government or any agency or political subdivision thereof.

   "Place of Payment," when used with respect to the Securities of any
series, means the place or places where the principal of (and premium, if
any) and interest on the Securities of that series are payable as specified
as contemplated by Section 301.

   "Predecessor Security" of any particular Security means every
previous Security evidencing all or a portion of the same debt as that
evidenced by such particular Security; and, for the purposes of this
definition, any Security authenticated and delivered under Section 306 in
exchange for or in lieu of a mutilated, destroyed, lost or stolen Security
shall be deemed to evidence the same debt as the mutilated, destroyed, lost
or stolen Security.

   "Redemption Date," when used with respect to any Security to be
redeemed, means the date fixed for such redemption by or pursuant to this
Indenture.

   "Redemption Price," when used with respect to any Security to be
redeemed, means the price at which it is to be redeemed pursuant to this
Indenture.

   "Regular Record Date" for the interest payable on any Interest
Payment Date on the Securities of any series means the date specified for
that purpose as contemplated by Section 301.

   "Responsible Officer," when used with respect to the Trustee, means
the chairman or vice-chairman of the board of directors, the chairman or
any vice-chairman of the executive committee of the board of directors, the
chairman of the trust committee, the president, any vice president, the
secretary, any assistant secretary, the treasurer, any assistant treasurer,
the cashier, any assistant cashier, any trust officer or assistant trust
officer, the controller or any assistant controller or any other officer of
the Trustee customarily performing functions similar to those performance
by any of the above designated officers and also means, with respect to a
particular corporate trust matter, any other officer to whom such matter is
referred because of his knowledge and familiarity with the particular
subject.

   "Restricted Subsidiary" means AMBAC Assurance Corporation and any
successor to all or substantially all of its business, provided that such
successor is a Subsidiary.

   "Securities" has the meaning stated in the first recital of this
Indenture and more particularly means any Securities authenticated and
delivered under this Indenture.

   "Security Register" and "Security Registrar" have the respective
meanings specified in Section 305.

   "Special Record Date" for the payment of any Defaulted Interest
means a date fixed by the Trustee pursuant to Section 307.

   "Stated Maturity," when used with respect to any Security or any
installment of principal thereof or interest thereon, means the date
specified in such Security as the fixed date on which the principal of such
<PAGE>

Security or such installment of principal or interest is due and payable.

   "Subsidiary" means a corporation more than 50% of the outstanding
Voting Stock of which is owned, directly or indirectly, by the Company or
by one or more other Subsidiaries, or by the Company and one or more other
Subsidiaries.

   "Trustee" means the Person named as the "Trustee" in the first
paragraph of this instrument until a successor Trustee shall have become
such pursuant to the applicable provisions of this Indenture, and
thereafter "Trustee" shall mean or include each person who is then a
Trustee hereunder, and if at any time there is more than one such person,
"Trustee" as used with respect to the Securities of any series shall mean
the Trustee with respect to Securities of that series.

   "Trust Indenture Act" means the Trust Indenture Act of 1939 as in
force at the date as of which this instrument was executed, except as
provided in Section 905.

   "U.S. Government Obligations" means direct obligations of the
United States for the payment of which its full faith and credit is
pledged, or obligations of a Person controlled or supervised by and acting
as an agency or instrumentality of the United States and the payment of
which is unconditionally guaranteed as a full faith and credit obligation
by the United States which, in either case, are not callable or redeemable
at the option of the issuer thereof, and shall also include a depository
receipt issued by a bank (as defined in Section 3(a)(2) of the Securities
Act of 1933, as amended) as custodian with respect to any such U.S.
Government Obligations or a specific payment of principal of or interest on
any such U.S. Government Obligations held by such custodian for the account
of the holder of such depository receipt, provided that (except as required
by law) such custodian is not authorized to make any deduction from the
amount payable to the holder of such depository receipt from any amount
received by the custodian in respect of the U.S. Government Obligations or
the specific payment of principal of or interest on the U.S. Government
Obligations evidenced by such depository receipt.

   "Vice President," when used with respect to the Company or the
Trustee, means any vice president, whether or not designated by a number or
a word or words added before or after the title "vice president."

   "Voting Stock" means, with respect to any Subsidiary, stock of any
class or classes (or equivalent interest), if the holders of the stock of
such class or classes (or equivalent interests) are ordinarily, in the
absence of contingencies, entitled to vote for the election of the
directors (or persons performing similar functions) of such corporation,
even though the right so to vote has been suspended by the happening of
such a contingency.

SECTION 102.  COMPLIANCE CERTIFICATES AND OPINIONS.

   Upon any application or request by the Company to the Trustee to
take any action under any provision of this Indenture, the Company shall
furnish to the Trustee an Officers' Certificate stating that all conditions
precedent, if any, provided for in this Indenture relating to the proposed
action have been complied with and an Opinion of Counsel stating that in
the opinion of such counsel all such conditions precedent, if any, have
been complied with, except that in the case of any such application or
request as to which the furnishing of such documents is specifically
<PAGE>

required by any provision of this Indenture relating to such particular
application or request, no additional certificate or opinion need be
furnished.

   Every certificate or opinion with respect to compliance with a
covenant or condition provided for in this Indenture (other than pursuant
to Section 1010) shall include:

    (1) a statement that each individual signing such certificate
  or opinion has read such covenant or condition and the definitions
  herein relating thereto;

    (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 each such individual,
  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 complied with; and

    (4) a statement as to whether, in the opinion of each such
  individual, such covenant or condition has been complied with.

SECTION 103.  FORM OF DOCUMENTS DELIVERED TO TRUSTEE.

   In any case where several matters are required to be certified by,
or covered by an opinion of, any specified Person, it is not necessary that
all such matters be certified by, or covered by the opinion of, only one
such Person, or that they be so certified or covered by only one document,
but one such Person may certify or give an opinion with respect to some
matters and one or more other such Persons as to other matters, and any
such Person may certify or give an opinion as to such matters in one or
several documents.

   Any certificate or opinion of an officer of the Company may be
based, insofar as it relates to legal matters, upon a certificate or
opinion of, or representations by, counsel, unless such officer knows, or
in the exercise of reasonable care should know, that the certificate or
opinion or representations with respect to the matters upon which his
certificate or opinion is based are erroneous. Any such certificate or
Opinion of Counsel may be based, insofar as it relates to factual matters,
upon a certificate or opinion of, or representations by, an officer or
officers of the Company stating that the information with respect to such
factual matters is in the possession of the Company, unless such counsel
knows, or in the exercise of reasonable care should know, that the
certificate or opinions or representations with respect to such matters are
erroneous.

   Where any Person is required to make, give or execute two or more
applications, requests, consents, certificates, statements, opinions or
other instruments under this Indenture, they may, but need not, be
consolidated and form one instrument.

SECTION 104.  ACTS OF HOLDERS.

   (a) Any request, demand, authorization, direction, notice, consent,
waiver or other action provided by this Indenture to be given or taken by
Holders may be embodied in and evidenced by one or more instruments of
<PAGE>

substantially similar tenor signed by such Holders in person or by agent
duly appointed in writing; and, except as herein otherwise expressly
provided, such action shall become effective when such instrument or
instruments are delivered to the Trustee and, where it is hereby expressly
required, to the Company. Such instrument or instruments (and the action
embodied therein and evidenced thereby) are herein sometimes referred to as
the "Act" of the Holders signing such instrument or instruments. Proof of
execution of any such instrument or of a writing appointing any such agent
shall be sufficient for any purpose of this Indenture and conclusive in
favor of the Trustee and the Company, if made in the manner provided in
this Section.

   (b) The fact and date of the execution by any Person of any such
instrument or writing may be proved by the affidavit of a witness of such
execution or by a certificate of a notary public or other officer
authorized by law to take acknowledgments of deeds, certifying that the
individual signing such instrument or writing acknowledged to him the
execution thereof. Where such execution is by a signer acting in a capacity
other than his individual capacity, such certificate or affidavit shall
also constitute sufficient proof of his authority. The fact and date of the
execution of any such instrument or writing, or the authority of the Person
executing the same, may also be proved in any other manner which the
Trustee deems sufficient.

   (c) At any time, the ownership of Securities shall be proved by the
Security Register.

   (d) Any request, demand, authorization, direction, notice, consent,
waiver or other Act of the Holder of any Security shall bind every future
Holder of the same Security and the Holder of every Security issued upon
the registration of transfer thereof or in exchange therefor or in lieu
thereof in respect of anything done, omitted or suffered to be done by the
Trustee or the Company in reliance thereon, whether or not notation of such
action is made upon such Security.

SECTION 105.  NOTICES, ETC., TO TRUSTEE AND COMPANY.

   Any request, demand, authorization, direction, notice, consent,
waiver or Act of Holders or other document provided or permitted by this
Indenture to be made upon, given or furnished to, or filed with,

    (1) the Trustee by any Holder or by the Company shall be
  sufficient for every purpose hereunder if made, given, furnished or
  filed in writing to or with the Trustee at its Corporate Trust Office,
  Attention: Corporate Trust Administration Division, or

    (2) the Company by the Trustee or by any Holder shall be
  sufficient for every purpose hereunder (unless otherwise herein
  expressly provided) if in writing and mailed, first-class postage
  prepaid, to the Company addressed to it at the address of its
  principal office specified in the first paragraph of this instrument
  or at any other address previously furnished in writing to the Trustee
  by the Company.

SECTION 106.  NOTICE TO HOLDERS; WAIVER.

   Where this Indenture provides for notice to Holders of any event,
such notice shall be sufficiently given (unless otherwise herein expressly
provided) if in writing and mailed, first class postage prepaid, to each
<PAGE>

Holder affected by such event, at his address as it appears in the Security
Register, not later than the latest date, and not earlier than the earliest
date, prescribed for the giving of such notice. In any case where notice to
Holders is given by mail, neither the failure to mail such notice, nor any
defect in any notice so mailed, to any particular Holder shall affect the
sufficiency of such notice with respect to other Holders. Where this
Indenture provides for notice in any manner, such notice may be waived in
writing by the Person entitled to receive such notice, either before or
after the event, and such waiver shall be the equivalent of such notice.
Waivers of notice by Holders shall be filed with the Trustee, but such
filing shall not be a condition precedent to the validity of any action
taken in reliance upon such waiver.

   In case by reason of the suspension of regular mail service or by
reason of any other cause it shall be impracticable to give such notice by
mail, then such notification as shall be made with the approval of the
Trustee shall constitute a sufficient notification for every purpose
hereunder.

SECTION 107.  EFFECT OF HEADINGS AND TABLE OF CONTENTS.

   The Article and Section headings herein and the Table of Contents
are for convenience only and shall not affect the construction hereof.

SECTION 108.  SUCCESSORS AND ASSIGNS.

   All covenants and agreements in this Indenture by the Company shall
bind its successors and assigns, whether so expressed or not.

SECTION 109.  SEPARABILITY CLAUSE.

   In case any provision in this Indenture or in the Securities shall
be invalid, illegal or unenforceable, the validity, legality and
enforceability of the remaining provisions shall not in any way be affected
or impaired thereby.

SECTION 110.  BENEFITS OF INDENTURE.

   Nothing in this Indenture or in the Securities, express or implied,
shall give to any Person, other than the parties hereto and their
successors hereunder and the Holders, any benefit or any legal or equitable
right, remedy or claim under this Indenture.

SECTION 111.  GOVERNING LAW.

   This Indenture and the Securities shall be governed by and
construed in accordance with the laws of the State of New York. This
Indenture is subject to the provisions of the Trust Indenture Act of 1939,
as amended, that are required to be part of this Indenture and shall, to
the extent applicable, be governed by such provisions.

SECTION 112.  LEGAL HOLIDAYS.

   In any case where any Interest Payment Date, Redemption Date or
Stated Maturity of any Security shall not be a Business Day at any Place of
Payment or in New York City, then (notwithstanding any other provision of
this Indenture or of the Securities) payment of interest or principal (and
premium, if any) need not be made at such Place of Payment on such date,
but may be made on the next succeeding Business Day at such Place of
<PAGE>

Payment with the same force and effect as if made on the Interest Payment Date
or Redemption Date, or at the Stated Maturity, provided that no interest shall
accrue for the period from and after such Interest Payment Date, Redemption Date
or Stated Maturity, as the case may be.

                                  ARTICLE TWO

                                SECURITY FORMS

SECTION 201.  FORMS GENERALLY.

   The Securities of each series shall be in substantially such form as shall be
established by or pursuant to a Board Resolution or in one or more indentures
supplemental hereto, in each case with such appropriate insertions, omissions,
substitutions and other variations as are required or permitted by this
Indenture, and may have such letters, numbers or other marks of identification
and such legends or endorsements placed thereon as may be required to comply
with the rules of any securities exchange or as may, consistently herewith, be
determined by the officers executing such Securities, as evidenced by their
execution of the Securities. If the form of Securities of any series is
established by action taken pursuant to a Board Resolution, a copy of an
appropriate record of such action shall be certified by the Secretary or an
Assistant Secretary of the Company and delivered to the Trustee at or prior to
the delivery of the Company Order contemplated by Section 303 for the
authentication and delivery of such Securities.

   The Trustee's certificates of authentication shall be in substantially the
form set forth in this Article.

   The definitive Securities shall be printed, lithographed or engraved on steel
borders or may be produced in any other manner, all as determined by the
officers executing such Securities, as evidenced by their execution of such
Securities.

SECTION 202.  ADDITIONAL PROVISIONS IN GLOBAL SECURITIES.

   Any Global Security may provide that it shall represent the aggregate or
specified amount of Outstanding Securities from time to time endorsed thereon
and may also provide that the aggregate amount of Outstanding Securities
represented thereby may from time to time be reduced to reflect exchanges. Any
endorsement of a Security in global form to reflect the amount, or any increase
or decrease in the amount or changes in the rights of Holders of Outstanding
Securities represented thereby shall be made in such manner and by such Person
or Persons as shall be specified therein or in the Company Order to be delivered
to the Trustee pursuant to Section 303 or Section 304. Subject to the provisions
of Section 303 and, if applicable, Section 304, the Trustee shall deliver and
redeliver any Security in permanent global form in the manner and upon
instructions given by the Person or Persons specified therein or in the
applicable Company Order. If a Company Order pursuant to Section 303 or 304 has
been, or simultaneously is, delivered, any instructions by the Company with
respect to a Security in global form shall be in writing but need not comply
with Section 314(c) of the Trust Indenture Act.

   Notwithstanding the provisions of Section 307, unless otherwise specified as
contemplated by Section 301, payment of principal of and any premium and
interest on any Security in permanent global form shall be made
<PAGE>

to the Person or Persons specified therein.

   Notwithstanding the provisions of Section 308 and except as
provided in the preceding paragraph, the Company, the Trustee and any agent
of the Company and the Trustee shall treat as the Holder of such principal
amount of Outstanding Securities represented by a permanent Global Security
the registered Holder of such permanent Global Security.

SECTION 203.  FORM OF TRUSTEE'S CERTIFICATE OF AUTHENTICATION.

   This is one of the Securities of the series designated therein
referred to in the within-mentioned Indenture.

                                      FIRST UNION NATIONAL BANK,
                                      as Trustee

                                      By________________________
                                          Authorized Officer

                                 ARTICLE THREE

                                THE SECURITIES

SECTION 301.  AMOUNT UNLIMITED; ISSUABLE IN SERIES.

   The aggregate principal amount of Securities which may be
authenticated and delivered under this Indenture is unlimited.

   The Securities may be issued in one or more series. There shall be
established in or pursuant to a Board Resolution, and set forth in an
Officers' Certificate, or established in one or more indentures
supplemental hereto, prior to the issuance of Securities of any series,

    (1) the title of the Securities of the series (which shall
  distinguish the Securities of the series from all other Securities);

    (2) any limit upon the aggregate principal amount of the
  Securities of the series which may be authenticated and delivered
  under this Indenture (except for Securities authenticated and
  delivered upon registration of transfer of, or in exchange for, or in
  lieu of, other Securities of the series pursuant to Section 304, 305,
  306, 906, 1107 or 1305);

    (3) the date or dates on which the principal of the Securities
  of the series is payable;

    (4) the rate or rates at which the Securities of the series
  shall bear interest, if any, the date or dates from which such
  interest shall accrue, the Interest Payment Dates on which such
  interest shall be payable and the Regular Record Date for the interest
  payable on any Interest Payment Date;

    (5) the place or places where the principal of (and premium, if
  any) and interest on Securities of the series shall be payable;

    (6) the period or periods within which, the price or prices at
  which and the terms and conditions upon which Securities of the series
<PAGE>

  may be redeemed, in whole or in part, at the option of the Company, if
  the Company is to have that option;

    (7) the obligation, if any, of the Company to redeem, repay or purchase
  Securities of the series pursuant to any sinking fund or analogous provision
  or at the option of a Holder thereof, and the period or periods within which,
  the price or prices at which, the Currency in which, and other terms and
  conditions upon which Securities of the series shall be redeemed, repaid or
  purchased, in whole or in part, pursuant to such obligation;

    (8) if other than denominations of $1,000 and integral multiples thereof,
  the denominations in which Securities of the series shall be issuable;

    (9) if other than the principal amount thereof, the portion of the principal
  amount of Securities of the series which shall be payable upon declaration of
  acceleration of the Maturity thereof pursuant to Section 502 or the method by
  which such portion shall be determined;

    (10) if other than Dollars, the Currency in which payment of the principal
  of (and premium, if any) or interest, if any, on the Securities of the series
  shall be payable or in which the Securities of the series shall be
  denominated;

    (11) whether the amount of payments of principal of (and premium, if any) or
  interest on the Securities of the series may be determined with reference to
  an index, formula or other method (which index, formula or method may be
  based, without limitation, on one or more Currencies, commodities, equity
  indices or other indices), and the manner in which such amounts shall be
  determined;

    (12) provisions, if any, granting special rights to the Holders of
  Securities of the series upon the occurrence of such events as may be
  specified;

    (13) any deletions from, modifications of or additions to the Events of
  Default or covenants of the Company with respect to Securities of the series,
  whether or not such Events of Default or covenants are consistent with the
  Events of Default or covenants set forth herein;

    (14) the application, if any, of Section 1402 or 1403 to the Securities of
  any series;

    (15) whether the Securities of the series shall be issued in whole or in
  part in the form of a Global Security or Securities; the terms and conditions,
  if any, upon which such Global Securities or Securities may be exchanged in
  whole or in part for other definitive Securities; and the Depositary for such
  Global Security or Securities, which Depositary must be a clearing agency
  registered under the Securities Exchange Act of 1934;

    (16) any trustees, authenticating or paying agents, transfer agents or
  registrars or any other agents with respect to the Securities of such series;
  and

    (17) any other terms of the series (which terms shall not be
<PAGE>

  inconsistent with the provisions of this Indenture).

   All Securities of any one series shall be substantially identical
except as to denomination and except as may otherwise be provided in or
pursuant to such Board Resolution and set forth in such Officers'
Certificate or in any such Indenture supplemental hereto.

   If any of the terms of the series are estab1ished by action taken
pursuant to a Board Resolution, copy of an appropriate record of such
action shall be certified by the Secretary or an Assistant Secretary of the
Company and delivered to the Trustee at or prior to the delivery of the
Officers' Certificate setting forth the terms of the series.

SECTION 302.  DENOMINATIONS.

   The Securities of each series shall be issuable in registered form
without coupons in such denominations as shall be specified as contemplated
by Section 301. With respect to Securities of any series denominated in
Dollars, in the absence of any such provisions, the Securities of such
series, other than Securities issued in global form (which may be of any
denomination), shall be issuable in denominations of $1,000 and any
integral multiple thereof.

SECTION 303.  EXECUTION, AUTHENTICATION, DELIVERY AND DATING.

   The Securities shall be executed on behalf of the Company by its
Chairman of the Board, its President or one of its Vice Presidents, under
its corporate seal reproduced thereon attested by its Secretary or one of
its Assistant Secretaries. The signature of any of these officers on the
Securities may be manual or facsimile.

   Securities bearing the manual or facsimile signatures of individuals who were
at any time the proper officers of the Company shall bind the Company,
notwithstanding that such individuals or any of them have ceased to hold such
offices prior to the authentication and delivery of such Securities or did not
hold such offices at the date of such Securities.

   At any time and from time to time after the execution and delivery
of this Indenture, the Company may deliver Securities of any series
executed by the Company to the Trustee for authentication, together with a
Company Order for the authentication and delivery of such Securities, and
the Trustee in accordance with the Company Order shall authenticate and
deliver such Securities. If the form or terms of the Securities of the
series have been established in or pursuant to one or more Board
Resolutions as permitted by Sections 201 and 301, in authenticating such
Securities, and accepting the additional responsibilities under this
Indenture in relation to such series of Securities, the Trustee shall be
entitled to receive, and shall be fully protected in relying upon, an
Opinion of Counsel stating,

   (a) if the form of such Securities has been established by or pursuant to a
Board Resolution as permitted by Section 201, that such form has been
established in conformity with the provisions of this Indenture;

   (b) if the terms of such Securities have been established by or pursuant to a
Board Resolution as permitted by Section 301, that such terms have been
established in conformity with the provisions of this Indenture; and
<PAGE>

   (c) that such Securities, when authenticated and delivered by the
Trustee and issued by the Company in the manner and subject to any
conditions specified in such Opinion of Counsel, will constitute valid and
legally binding obligations of the Company, enforceable in accordance with
their terms, subject to bankruptcy, insolvency, reorganization and other
laws of general applicability relating to or affecting the enforcement of
creditors' rights and to general principles of equity.

   If such form or terms have been so established, the Trustee shall
not be required to authenticate such Securities if the issue of such
Securities pursuant to this Indenture will affect the Trustee's own rights,
duties or immunities under the Securities and this Indenture or otherwise
in a manner which is not reasonably acceptable to the Trustee.

   If all of the Securities of a series are not to be originally
issued at the same time, then the documents required to be delivered
pursuant to this Section 303 must be delivered only once, prior to the
authentication and delivery of the first Security of such series; provided,
however, that any subsequent request by the Company to the Trustee to
authenticate Securities of such series upon original issuance shall
constitute a representation and warranty by the Company that, as of the
date of such request, the statements made in the Officers' Certificate
delivered pursuant to Section 301 shall be true and correct as if made on
such date and that all the conditions precedent, if any, provided for in
this Indenture or the terms of the Securities of such series relating to
the authentication and delivery of Securities of such series have been
complied with.

   If the Company shall establish pursuant to Section 301 that the
Securities of a series are to be issued in whole or in part in the form of
one or more Global Securities, then the Company shall execute and the
Trustee shall, in accordance with this Section and the Company Order with
respect to such series, authenticate and deliver one or more Global
Securities that (i) shall represent and shall be denominated in an amount
equal to the aggregate principal amount of the Outstanding Securities of
such series to be represented by such Global Security or Securities, (ii)
shall be registered in the name of the Depositary for such Global Security
or Securities or the nominee of such Depositary, (iii) shall be delivered
by the Trustee to such Depositary or pursuant to such Depositary's
instruction and (iv) shall bear a legend substantially to the following
effect: "Unless and until it is exchanged in whole or in part for
Securities in certificated form, this Security 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" or to such other
effect as the Depositary and the Trustee may agree.

   Each Depositary designated pursuant to Section 301 must, at the time of its
designation and at all times while it serves as Depositary, be a clearing agency
registered under the Securities Exchange Act of 1934, as amended, and any other
applicable statute or regulation. The Trustee shall have no responsibility to
determine if the Depositary is so registered. Each Depositary may enter into an
agreement with the Trustee and the Company governing their respective duties and
rights with regard to Global Securities.

   Each Security shall be dated the date of its authentication.
<PAGE>

   No Security shall be entitled to any benefit under this Indenture
or be valid or obligatory for any purpose unless there appears on such
Security a certificate of authentication substantially in the form provided
for herein executed by the Trustee by manual signature, and such
certificate upon any Security shall be conclusive evidence, and the only
evidence, that such Security has been duly authenticated and delivered
hereunder and is entitled to the benefits of this Indenture.

SECTION 304.  TEMPORARY SECURITIES.

   Pending the preparation of definitive Securities of any series, the
Company may execute, and upon Company Order the Trustee shall authenticate
and deliver, temporary Securities which are printed, lithographed,
typewritten, mimeographed or otherwise produced, in any authorized
denomination, substantially of the tenor of the definitive Securities in
lieu of which they are issued and with such appropriate insertions,
omissions, substitutions and other variations as the officers executing
such Securities may determine, as evidenced by their execution of such
Securities.

   Except in the case of temporary Securities in global form, which
shall be exchanged in accordance with the provisions thereof, if temporary
Securities of any series are issued, the Company will cause definitive
Securities of such series to be prepared without unreasonable delay. After
the preparation of definitive Securities of such series, the temporary
Securities of such series shall be exchangeable for definitive Securities
of such series upon surrender of the temporary Securities of such series at
the office or agency of the Company in a Place of Payment for that series,
without charge to the Holder. Upon surrender for cancellation of any one or
more temporary Securities of any series the Company shall execute and the
Trustee shall authenticate and deliver in exchange therefor a like
principal amount of definitive Securities of the same series of authorized
denominations. Until so exchanged the temporary Securities of any series
shall in all respects be entitled to the same benefits under this Indenture
as definitive Securities of such series.

SECTION 305.  REGISTRATION, REGISTRATION OF TRANSFER AND EXCHANGE.

   The Company shall cause to be kept, at an office or agency of the
Company maintained pursuant to Section 1002, a register (herein sometimes
referred to as the "Security Register") in which, subject to such
reasonable regulations as it may prescribe, the Company shall provide for
the registration of Securities and of transfers of Securities. Such office
or agency shall be the "Security Registrar" for the purpose of registering
Securities and transfers as herein provided. The Corporate Trust Office of
the Trustee is hereby initially appointed Security Registrar.

   Upon surrender for registration of transfer of any Security of any
series at the office or agency in a Place of Payment for that series, the
Company shall execute, and the Trustee shall authenticate and deliver, in
the name of the designated transferees, one or more new Securities of the
same series, of any authorized denominations and of a like aggregate
principal amount and tenor.

   At the option of the Holder, Securities of any series may be
exchanged for other Securities of the same series with the same terms, of
any authorized denominations and of a like aggregate principal amount and
tenor, upon surrender of the Securities to be exchanged at such office or
<PAGE>

agency. Whenever any Securities are so surrendered for exchange, the
Company shall execute, and the Trustee shall authenticate and deliver, the
Securities which the Holder making the exchange is entitled to receive.

   All Securities issued upon any registration of transfer or exchange
of Securities shall be the valid obligations of the Company, evidencing the
same debt, and entitled to the same benefits under this Indenture, as the
Securities surrendered upon such registration of transfer or exchange.

   Every Security presented or surrendered for registration of
transfer or for exchange shall (if so required by the Company or the
Trustee) be duly endorsed, or be accompanied by a written instrument of
transfer in form satisfactory to the Company and the Security Registrar
duly executed, by the Holder thereof or his attorney duly authorized in
writing.

   No service charge shall be made for any registration of transfer or
exchange of Securities, but the Company may require payment of a sum
sufficient to cover any tax or other governmental charge that may be
imposed in connection with any registration of transfer or exchange of
Securities, other than exchanges pursuant to Section 304, 906 or 1107 not
involving any transfer.

   The Company shall not be required (i) to issue, register the transfer of or
exchange Securities of any series during a period beginning at the opening of
business 15 days before the day of the mailing of a notice of redemption of
Securities of that series selected for redemption under Section 1103 and ending
at the close of business on the day of such mailing, or (ii) to register the
transfer of or exchange any Security so selected for redemption in whole or in
part, except the unredeemed portion of any Security being redeemed in part.

   Notwithstanding the foregoing, except as otherwise specified as
contemplated by Section 301, any Global Security shall be exchangeable
pursuant to this Section 305 for Securities registered in the names of
Persons other than the Depositary with respect to such Security or its
nominee only as provided in this paragraph. A Global Security shall be so
exchangeable pursuant to this Section 305 if (i) the Depositary with
respect to such Global Security notifies the Company that it is unwilling
or unable to continue as Depositary for such Global Security or if at any
time such Depositary ceases to be a clearing agency registered under the
Securities Exchange Act of 1934, as amended, and, in either such case, a
successor Depositary is not appointed by the Company within 90 days, (ii)
the Company executes and delivers to the Trustee a Company Order that such
Global Security shall be so exchangeable or (iii) there shall have occurred
and be continuing an Event of Default, or an event which, with the giving
of notice or lapse of time, or both, would constitute an Event of Default,
with respect to the Securities. Upon the exchange of a Global Security for
Securities in certificated form, such Global Security shall be cancelled by
the Trustee. Any Global Security that is exchangeable pursuant to the
preceding sentence shall be exchangeable for Securities registered in such
names as the Depositary with respect to such Global Security shall direct.

   Notwithstanding any other provision of this Section 305, unless and
until it is exchanged in whole or in part for Securities in certificated
form, a Global Security may not be transferred except as a whole by the
Depositary with respect to such Global Security to a nominee of such
Depositary, or by a nominee of such Depositary to such Depositary or to
another nominee of such Depositary.
<PAGE>

SECTION 306.  MUTILATED, DESTROYED, LOST AND STOLEN SECURITIES.

   If any mutilated Security is surrendered to the Trustee, the Company shall
execute and the Trustee shall authenticate and deliver in exchange therefor a
new Security of the same series and of like tenor and principal amount and
bearing a number not contemporaneously outstanding.

   If there shall be delivered to the Company and the Trustee (i) evidence to
their satisfaction of the destruction, loss or theft of any Security and (ii)
such security or indemnity as may be required by them to save each of them and
any agent of either of them harmless, then, in the absence of notice to the
Company or the Trustee that such Security has been acquired by a bona fide
purchaser, the Company shall execute and upon its request the Trustee shall
authenticate and deliver, in lieu of any such destroyed, lost or stolen
Security, a new Security of the same series and of like tenor and principal
amount and bearing a number not contemporaneously outstanding.

   In any case such mutilated, destroyed, lost or stolen Security has become or
is about to become due and payable, the Company in its discretion may, instead
of issuing a new Security, pay such Security.

   Upon the issuance of any new Security under this Section, the Company may
require the payment of a sum sufficient to cover any tax or other governmental
charge that may be imposed in relation thereto and any other expenses (including
the fees and expenses of the Trustee) incurred in connection therewith.

   Every new Security of any series issued pursuant to this Section in
lieu of any destroyed, lost or stolen Security shall constitute an original
additional contractual obligation of the Company, whether or not the
destroyed, lost or stolen Security shall be at any time enforceable by
anyone, and shall be entitled to all the benefits of this Indenture equally
and proportionately with any and all other Securities of that series duly
issued hereunder.

   The provisions of this Section are exclusive and shall preclude (to
the extent lawful) all other rights and remedies with respect to the
replacement or payment of mutilated, destroyed, lost or stolen Securities.

SECTION 307.  PAYMENT OF INTEREST; INTEREST RIGHTS PRESERVED.

   Interest on any Security which is payable, and is punctually paid
or duly provided for, on any Interest Payment Date shall be paid to the
Person in whose name that Security (or one or more Predecessor Securities)
is registered at the close of business on the Regular Record Date for such
interest at the office or agency of the Company maintained for such purpose
pursuant to Section 1002; provided, however, that each installment of
interest on any Security may at the Company's option be paid by mailing a
check for such interest, payable to or upon the written order of the Person
entitled thereto pursuant to Section 308, to the address of such Person as
it appears on the Security Register.

   Any interest on any Security of any series which is payable, but is
not punctually paid or duly provided for, on any Interest Payment Date
(herein called "Defaulted Interest") shall forthwith cease to be payable to
the Holder on the relevant Regular Record Date by virtue of having been
such Holder, and such Defaulted Interest may be paid by the Company, at its
<PAGE>

election in each case, as provided in Clause (1) or (2) below:

      (1) The Company may elect to make payment of any Defaulted
   Interest to the Persons in whose names the Securities of such
   series (or their respective Predecessor Securities) 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 in writing of the
   amount of Defaulted Interest proposed to be paid on each Security
   of such series and the date of the proposed payment, and at the
   same time the Company shall deposit with the Trustee an amount of
   money in the Currency in which the Securities of each series are
   payable (except as otherwise specified pursuant to Section 301 for
   the Securities of such series) equal to the aggregate amount
   proposed to be paid in respect of such Defaulted Interest or shall
   make arrangements satisfactory to the Trustee for such deposit on
   or prior to the date of the proposed payment, such money when
   deposited to be held in trust for the benefit of the Persons
   entitled to such Defaulted Interest as in this Clause provided.
   Thereupon the Trustee 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 Trustee
   of the notice of the proposed payment. The Trustee shall promptly
   notify the Company 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
   of Securities of such series at his address as it appears in the
   Security Register, 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 so
   mailed, such Defaulted Interest shall be paid to the Persons in
   whose names the Securities of such series (or their respective
   Predecessor Securities) are registered at the close of business 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 on
   the Securities of any series in the Currency in which the Securities
   of each series are payable in any other lawful manner not inconsistent
   with the requirements of any securities exchange on which such
   Securities may be listed, and upon such notice as may be required by
   such exchange, if, after notice given by the Company to the Trustee of
   the proposed payment pursuant to this Clause, such manner of payment
   shall be deemed practicable by the Trustee.

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

SECTION 308.  PERSONS DEEMED OWNERS.

   Prior to due presentment of a Security for registration of transfer, the
Company, the Trustee and any agent of the Company or the Trustee may treat the
Person in whose name such Security is registered as the owner of such Security
for the purpose of receiving payment of
<PAGE>

principal of (and premium, if any) and (subject to Section 307) interest on
such Security and for all other purposes whatsoever, whether or not such
Security be overdue, and neither the Company, the Trustee nor any agent of
the Company or the Trustee shall be affected by notice to the contrary.

   No holder of any beneficial interest in any Global Security held on
its behalf by a Depositary shall have any rights under this Indenture with
respect to such Global Security, and such Depositary may be treated by the
Company, the Trustee, and any agent of the Company or the Trustee as the
owner of such Global Security for all purposes whatsoever. Notwithstanding
the foregoing, nothing herein shall prevent the Company, the Trustee, or
any agent of the Company or the Trustee, from giving effect to any written
certification, proxy or other authorization furnished by a Depositary or
impair, as between a Depositary and such holders of beneficial interests,
the operation of customary practices governing the exercise of the rights
of the Depositary as Holder of any Security.

SECTION 309.  CANCELLATION.

   All Securities surrendered for payment, redemption, registration of
transfer or exchange or for credit against any sinking fund payment shall,
if surrendered to any Person other than the Trustee, be delivered to the
Trustee and shall be promptly cancelled by it. The Company may at any time
deliver to the Trustee for cancellation any Securities previously
authenticated and delivered hereunder which the Company may have acquired
in any manner whatsoever, and all Securities so delivered shall be promptly
cancelled by the Trustee. If the Company shall so acquire any of the
Securities, however, such acquisition shall not operate as a redemption or
satisfaction of the indebtedness represented by such Securities unless and
until the same are surrendered to the Trustee for cancellation. No
Securities shall be authenticated in lieu of or in exchange for any
Securities cancelled as provided in this Section, except as expressly
permitted by this Indenture. All cancelled Securities held by the Trustee
shall be disposed of as directed by a Company Order.

SECTION 310.  COMPUTATION OF INTEREST.

   Except as otherwise specified as contemplated by Section 301 for
Securities of any series, interest on the Securities of each series shall
be computed on the basis of a year of twelve 30-day months.

                                 ARTICLE FOUR

                          SATISFACTION AND DISCHARGE

SECTION 401.  SATISFACTION AND DISCHARGE OF INDENTURE.

   This Indenture shall upon Company Request cease to be of further
effect with respect to any series of Securities (except as to any surviving
rights of registration of transfer or exchange of Securities of such series
herein expressly provided for), and the Trustee, at the expense of the
Company and upon Company Request, shall execute proper instruments
acknowledging satisfaction and discharge of this Indenture as to such
series when

    (1) either

            (A) all Securities of such series theretofore
<PAGE>

    authenticated and delivered (other than (i) Securities which have been
    destroyed, lost or stolen and which have been replaced or paid as provided
    in Section 306 and (ii) Securities for whose payment money has, or U.S.
    Government Obligations have, theretofore been deposited in trust or
    segregated and held in trust by the Company and thereafter repaid to the
    Company or discharged from such trust, as provided in Section 1003) have
    been delivered to the Trustee for cancellation; or

            (B)   all Securities of such series not theretofore delivered to the
    Trustee for cancellation

            (i)   have become due and payable, or

            (ii)  will become due and payable at their Stated Maturity within
    one year, or

            (iii) are to be called for redemption within one year under
     arrangements satisfactory to the Trustee for the giving of notice of
     redemption by the Trustee in the name, and at the expense, of the Company,
     and the Company, in the case of (i), (ii) or (iii) above, has deposited or
     caused to be deposited with the Trustee as trust funds in trust for the
     purpose an amount, in the Currency in which the Securities of such series
     are payable, or U.S. Government Obligations, maturing as to principal and
     interest at such times as will assure the availability of cash, sufficient
     to pay and discharge the entire indebtedness on such Securities not
     theretofore delivered to the Trustee for cancellation, for principal (and
     premium, if any) and interest to the date of such deposit (in the case of
     Securities which have become due and payable) or to the Stated Maturity or
     Redemption Date, as the case may be;

    (2) the Company has paid or caused to be paid all other sums payable
  hereunder by the Company; and

    (3) the Company has delivered to the Trustee an Officers' Certificate and an
  Opinion of Counsel, each stating that all conditions precedent herein provided
  for relating to the satisfaction and discharge of this Indenture have been
  complied with.

   Notwithstanding the satisfaction and discharge of this Indenture,
the obligations of the Company to the Trustee under Section 606 and, if
money or U.S. Government Obligations shall have been deposited with the
Trustee pursuant to subclause (B) of clause (1) of this Section, the
obligations of the Trustee under Section 402 and the last paragraph of
Section 1003 shall survive.

SECTION 402.  APPLICATION OF TRUST MONEY.

   Subject to provisions of the last paragraph of Section 1003, all money and
U.S. Government Obligations deposited with the Trustee pursuant to Section 401
shall be held in trust and applied by it, in accordance with the provisions of
the Securities and this Indenture, to the payment, either directly or through
any Paying Agent (including the Company acting as its own Paying Agent) as the
Trustee may determine, to the Persons entitled thereto, of the principal (and
premium, if any) and interest for whose payment such money has been deposited
with the Trustee.
<PAGE>

                                 ARTICLE FIVE

                                   REMEDIES

SECTION 501.  EVENTS OF DEFAULT.

   "Event of Default", wherever used herein with respect to Securities
of any series, means any one of the following events (whatever the reason
for such Event of Default and whether it shall be voluntary or involuntary
or be effected 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) default in the payment of any interest upon any Security of
  such series when it becomes due and payable, and continuance of such
  default for a period of 30 days; or

    (2) default in the payment of the principal of (or premium, if
  any, on) any Security of such series at its Maturity; or

    (3) default in the payment of any sinking fund installment as
  and when the same shall become due and payable by the terms of the
  Securities of such series; or

    (4) default in the performance, or breach, of any covenant or
  warranty of the Company in this Indenture (other than a covenant or
  warranty a default in whose performance or whose breach is elsewhere
  in this Section specifically dealt with or which has expressly been
  included in this Indenture solely for the benefit of series of
  Securities other than such series), and continuance of such default or
  breach for a period of 60 days after there has been given, by
  registered or certified mail, to the Company by the Trustee or to the
  Company and the Trustee by the Holders of at least 25% in principal
  amount of all Outstanding Securities a written notice specifying such
  default or breach and requiring it to be remedied and stating that
  such notice is a "Notice of Default" hereunder; or

<PAGE>

    (5) the entry by a court having jurisdiction in the premises of (A) a decree
  or order for relief in respect of the Company or any Restricted Subsidiary in
  an involuntary case or proceeding under any applicable federal or state
  bankruptcy, insolvency, reorganization or other similar law or (B) a decree or
  order adjudging the Company or any Restricted Subsidiary a bankrupt or
  insolvent, or approving as properly filed a petition seeking reorganization,
  arrangement, adjustment, rehabilitation, conservation or composition of or in
  respect of the Company or any Restricted Subsidiary under any applicable
  federal or state law, or appointing a custodian, receiver, liquidator,
  assignee, trustee, rehabilitation, conservator, sequestrator or other similar
  official of the Company or any Restricted Subsidiary or of any substantial
  part of its property, or ordering the winding up or liquidation of its
  affairs, and the continuance of any such decree or order for relief or any
  such other decree or order unstayed and in effect for a period of 90
  consecutive days; or

    (6) the commencement by the Company or any Restricted Subsidiary of a
  voluntary case or proceeding under any applicable federal or state bankruptcy,
  insolvency, reorganization or other similar law or of any other case or
  proceeding to be adjudicated a bankrupt or insolvent, or the consent by it to
  the entry of a decree or order for relief in respect of the Company or any
  Restricted Subsidiary in an involuntary case or proceeding under any
  applicable federal or state bankruptcy, insolvency, reorganization or other
  similar law or to the commencement of any bankruptcy or insolvency case or
  proceeding against it, or the filing by it of a petition or answer or consent
  seeking reorganization or relief under any applicable federal or state law, or
  the consent by it to the filing of such petition or to the appointment of or
  taking possession by a custodian, receiver, liquidator, assignee, trustee,
  sequestrator or similar official of the Company or any Restricted Subsidiary
  or of any substantial part of its property, or the making by it of an
  assignment for the benefit of creditors, or the admission by it in writing of
  its inability to pay its debts generally as they become due, or the taking of
  corporate action by the Company or any Restricted Subsidiary in furtherance of
  any such action; or

    (7) any other Event of Default provided with respect to Securities of that
  series.

When the Trustee incurs expenses or renders services in connection with an
Event of Default specified in clauses (5) and (6) of this Section 501, the
expenses (including the reasonable charges and expenses of its counsel) and
the compensation for the services are intended to constitute expenses of
administration under any bankruptcy law.

SECTION 502.  ACCELERATION OF MATURITY; RESCISSION AND ANNULMENT.

   If an Event of Default described in clauses (1) (2), (3) or (7) of
Section 501 above with respect to Securities of any series at the time
Outstanding occurs and is continuing, then in every such case the Trustee
<PAGE>

or the Holders of not less than 25% in aggregate principal amount of the
Outstanding Securities of such series (each such series voting as a separate
class) may declare the principal amount (or, if the Securities of that series
are Original Issue Discount Securities, such portion of the principal amount as
may be specified in the terms of that series) of all of the Securities of that
series and interest accrued thereon, if any, to be due and payable immediately,
by a notice in writing to the Company (and to the Trustee if given by Holders),
and upon any such declaration such amount shall become immediately due and
payable. If an Event of Default described in clauses (4), (5) or (6) of Section
501 above with respect to Securities of all series at the time Outstanding
occurs and is continuing, then in every such case, the Trustee or the Holders of
not less than 25% in aggregate principal amount of all Outstanding Securities
hereunder (voting as a single class) may declare the principal amount (or, if
the Securities of any series are Original Issue Discount Securities, such
portion of the principal amount as may be specified in the terms of that series)
of all of the Securities then Outstanding and interest accrued thereon, if any,
to be due and payable immediately, by a notice in writing to the Company (and to
the Trustee if given by the Holders), and upon such declaration such amount
shall become immediately due and payable.

   At any time after such a declaration of acceleration with respect to
Securities of any series (or all Securities, as the case may be) has been made
and before a judgment or decree for payment of the money due has been obtained
by the Trustee as hereinafter in this Article provided, the Holders of a
majority in aggregate principal amount of the Outstanding Securities of such
series (voting as a separate class) with respect to an Event of Default
described in clauses (1), (2), (3) and (7) of Section 501 above, and the Holders
of a majority in aggregate principal amount of the Outstanding Securities of all
series (voting as a single class) with respect to an Event of Default described
in clause (4), (5) or (6) of Section 501 above, by written notice to the Company
and the Trustee, may rescind and annul such declaration and its consequences if

    (1)  the Company has paid or deposited with the Trustee a sum sufficient to
  pay

            (A) all Defaulted Interest on all Securities of such series (or on
    all Securities, as the case may be),

            (B) the principal of (and premium, if any, on) any Securities of
    such series (or of all Securities, as the case may be) which has become due
    otherwise than by such declaration of acceleration and interest thereon at
    the rate or rates prescribed therefor in such Securities,

            (C) to the extent that payment of such interest is lawful, interest
    upon overdue interest at the rate or rates prescribed therefor in such
    Securities, and

            (D) all sums paid or advanced by the Trustee hereunder and the
    reasonable compensation, expenses, disbursements and advances of the
    Trustee, its agents and counsel; and

    (2) all Events of Default with respect to Securities of such series (or all
  Securities, as the case may be), other than the non-payment of the principal
  of Securities which have become due solely by such declaration of
  acceleration, have been cured or waived
<PAGE>

  as provided in Section 513.

No such rescission shall affect any subsequent Event of Default or impair
any right consequent thereon.

SECTION 503.  COLLECTION OF INDEBTEDNESS AND SUITS FOR ENFORCEMENT BY
              TRUSTEE.

    The Company covenants that if there is a

      (1) default in the payment of any interest on any Security when such
  interest becomes due and payable and such default continues for a period of 30
  days, or

      (2) default in the payment of the principal of (or premium, if any, on)
  any Security at the Maturity thereof,

the Company will, upon demand of the Trustee, pay to the Trustee, for the
benefit of the Holders of such Securities, the whole amount then due and payable
on such Securities for principal (and premium, if any) and interest 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, at the
rate or rates prescribed therefor in such Securities, and, in addition thereto,
such further amount as shall be sufficient to cover the costs and expenses of
collection, including the reasonable compensation, expenses, disbursements and
advances of the Trustee, its agents and counsel.

   If an Event of Default with respect to Securities of any series occurs and is
continuing, the Trustee may in its discretion proceed to protect and enforce its
rights and the rights of the Holders of Securities of such series by such
appropriate judicial proceedings as the Trustee shall deem most effectual 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 504.  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 of such other obligor or their
creditors, the Trustee (irrespective of whether the principal of the Securities
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)
shall be entitled and empowered, by intervention in such proceeding or
otherwise,

       (i) to file and prove a claim for the whole amount of principal (and
  premium, if any) or such portion of the principal amount of any series of
  Original Issue Discount Securities as may be specified in the terms of such
  series, and interest owing and unpaid in respect of the Securities 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, its agents
  and counsel) and of the Holders allowed in such judicial proceeding, and
<PAGE>

       (ii) 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, its agent and counsel, and any other
amounts due the Trustee under Section 606.

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 Securities
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 505.  TRUSTEE MAY ENFORCE CLAIMS WITHOUT POSSESSION OF
              SECURITIES.

   All rights of action and claims under this Indenture or the Securities may be
prosecuted and enforced by the Trustee without the possession of any of the
Securities 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, and any recovery of judgment shall, after provision
for the payment of the reasonable compensation, expenses, disbursements and
advances of the Trustee, its agents and counsel, be for the ratable benefit of
the Holders of the Securities in respect of which such judgment has been
recovered.

   In connection with any filings of any claims pursuant to Section 317(a)(2) of
the Trust Indenture Act (i) the Trustee shall be entitled to collect and receive
any moneys or other property payable or deliverable on any such claims and to
distribute the same, (ii) unless prohibited by law or applicable regulation, to
vote on behalf of the Holders for the election of a trustee in bankruptcy or
other similar official, and any receiver trustee or similar official in any
proceeding is hereby authorized by each Holder to make such payments to the
Trustee and, if the Trustee consents to the making of such payments directly to
the Holders, to pay to the Trustee any amounts due it for the reasonable
compensation, expenses, disbursements and advances of the Trustee, its agents
and counsel, and any other amounts due the Trustee or any predecessor Trustee
under Section 606.

SECTION 506.  APPLICATION OF MONEY COLLECTED.

   Any money collected by the Trustee pursuant to this Article 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 (or premium, if any)
or interest, upon presentation of the Securities and the notation thereon of the
payment if only partially paid and upon surrender thereof if fully paid:

   FIRST: To the payment of all amounts due the Trustee or any predecessor
Trustee under Section 606; and

   SECOND: To the payment of the amounts then due and unpaid for principal of
(and premium, if any) and interest on the Securities 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
<PAGE>

amounts due and payable on such Securities for principal (and premium, if any)
and interest, respectively; and

   THIRD: The balance, if any, to the Person or Persons entitled thereto.

SECTION 507.  LIMITATION ON SUITS.

   No Holder of any Security of any series shall have any right 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

    (1) such Holder has previously given written notice to the Trustee of a
  continuing Event of Default with respect to the Securities of such series;

    (2) the Holders of not less than 25% in principal amount of the Outstanding
  Securities of that series in the case of any Event of Default described in
  clause (1), (2), (3) or (7) of Section 501, or, in the case of any Event of
  Default described in clause (4), (5) or (6) of Section 501, the Holders of not
  less than 25% in aggregate principal amount of all Outstanding Securities,
  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;

    (3) such Holder or Holders have offered to the Trustee reasonable indemnity
  against the costs, expenses and liabilities to be incurred in compliance with
  such request;

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

    (5) 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
  principal amount of the Outstanding Securities of that series in the case of
  any Event of Default described in clause (1), (2), (3) or (7) of Section 501,
  or, in the case of any Event of Default described in clause (4), (5) or (6) of
  Section 501, the Holders of not less than 25% in aggregate principal amount of
  all Outstanding Securities;

it being understood and intended that no one or more of such Holders shall have
any right in any manner whatever by virtue of, or by availing of, any provision
of this Indenture to affect, disturb or prejudice the rights of any other
Holders of Securities of the same series, in the case of any Event of Default
described in clauses (1), (2), (3) or (7) of Section 501, or of Holders of all
Securities in the case of any Event of Default described in clauses (4), (5), or
(6) of Section 501, or to obtain or to seek to obtain priority or preference
over any other of such Holders or to enforce any right under this Indenture,
except in the manner herein provided and for the equal and ratable benefit of
all Holders of Securities of the same series, in the case of any Event of
Default described in clauses (1), (2), (3) or (7) of Section 501, or of Holders
of all Securities in the case of any Event of Default described in clauses (4),
(5) or (6) of Section 501.

SECTION 508.  UNCONDITIONAL RIGHT OF HOLDERS TO RECEIVE PRINCIPAL,
              PREMIUM AND INTEREST.
<PAGE>

   Notwithstanding any other provision in this Indenture, the Holder of any
Security shall have the right, which is absolute and unconditional, to receive
payment, as provided herein (including, if applicable, Article Fourteen) of the
principal of (and premium, if any) and (subject to Section 307) interest on,
such Security on the respective due dates expressed in such Security (or, in the
case of redemption, on the Redemption Date) and to institute suit for the
enforcement of any such payment, and such rights shall not be impaired without
the consent of such Holder.

SECTION 509.  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 such case, subject to any determination in
such proceeding, the Company, 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.

SECTION 510.  RIGHTS AND REMEDIES CUMULATIVE.

   Except as otherwise provided with respect to the replacement or payment of
mutilated, destroyed, lost or stolen Securities in the last paragraph of Section
306, 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 511.  DELAY OR OMISSION NOT WAIVER.

   No delay or omission of the Trustee or of any Holder of any Securities to
exercise any right or remedy accruing upon any Event of Default shall impair any
such right or remedy or constitute a waiver of any such Event of Default or an
acquiescence therein. Every right and remedy given by this Article 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 512.  CONTROL BY HOLDERS.

   The Holders of not less than a majority in principal amount of the
Outstanding Securities of any series (with each series voting as a separate
class) shall have the right to direct the time, method and place of conducting
any proceeding pertaining to such series for any remedy available to the
Trustee, or exercising any trust or power conferred on the Trustee, relating to
or arising under clause (1), (2), (3) or (7) of Section 501, and the Holders of
not less than a majority in aggregate principal amount of all Outstanding
Securities 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 on the Trustee not relating to or arising under
clause (1), (2), (3) or (7) of Section 501, provided that, in each case:
<PAGE>

    (1) such direction shall not conflict with any rule of law or with this
  Indenture, and

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

SECTION 513.  WAIVER OF PAST DEFAULTS.

   Prior to the declaration of the acceleration of the maturity of the
Securities of any series as provided in Section 501, the Holders of not less
than a majority in aggregate principal amount of the Outstanding Securities of
such series, voting as a separate class, may, on behalf of the Holders of all
such Outstanding Securities of such series, waive any past default or Event of
Default described in clause (3) or (7) of Section 501, and the Holders of not
less than a majority in aggregate principal amount of all Outstanding Securities
hereunder (voting as a single class) may on behalf of the Holders of all
Outstanding Securities hereunder waive any past default or Event of Default
described in clause (4), (5) or (6) of Section 501 and its consequences, except
a default in respect of a covenant or provision hereof which under Article Nine
cannot be modified or amended without the consent of the Holder of each
Outstanding Security of such series 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 any right consequent thereon.

   The Company may, but shall not be obligated to, fix a record date for the
purpose of determining the Persons entitled to waive any past default hereunder.
If a record date is fixed, the Holders on such record date, or their duly
designated proxies, and only such Persons, shall be entitled to waive any
default hereunder, or to retract (prior to the requisite percentage for such
waiver to become effective having been obtained) any such waiver previously
given, whether or not such Holders remain Holders after such record date;
provided that, unless such waiver shall have become effective by virtue of such
requisite percentage have long been obtained prior to the date which is 90 days
after such record date, such waiver shall, automatically and without further
action by the Holder, be canceled and of no further force or effect.

SECTION 514.  WAIVER OF STAY OR EXTENSION LAWS.

   The Company covenants (to the extent that it may lawfully do so) that it will
not at any time insist upon, or plead, or in any manner whatsoever claim or take
the benefit or advantage of, any stay or extension law wherever enacted, now or
at any time hereafter in force, which may affect the covenants or the
performance of this Indenture; and the Company (to the extent that it may
lawfully do so) hereby expressly waives all benefit or advantage of any such law
and covenants that it will not hinder, delay or impede the execution of any
power herein granted to the Trustee, but will suffer and permit the execution of
every such power as though no such law had been enacted.
<PAGE>

                                  ARTICLE SIX

                                  THE TRUSTEE

SECTION 601.  NOTICE OF DEFAULTS.

   Within 90 days after the occurrence of any default hereunder with
respect to the Securities of any series, the Trustee shall transmit, in the
manner and to the extent provided in Section 313(c) of the Trust Indenture
Act, notice of such default hereunder known to the Trustee, unless such
default shall have been cured or waived; provided, however, that, except in
the case of a default in the payment of the principal of (or premium, if
any) or interest on any Security of such series or in the payment of any
sinking fund installment with respect to Securities of such series, the
Trustee shall be protected in withholding such notice if and so long as the
board of directors, the executive committee or a trust committee of
directors and/or a Responsible Officer of the Trustee in good faith
determines that the withholding of such notice is in the interest of the
Holders of Securities of such series; and provided further that in the case
of any default of the character specified in Section 501(4) with respect to
Securities of such series, no such notice to Holders shall be given until
at least 30 days after the occurrence thereof. For the purpose of this
Section, the term "default" means any event which is, or after notice or
lapse of time or both would become, an Event of Default with respect to
Securities of such series.

SECTION 602.  CERTAIN RIGHTS OF TRUSTEE.

   Subject to the provisions of the Trust Indenture Act:

   (a) the Trustee may rely and shall be protected in acting or
refraining from acting upon any resolution, certificate, statement,
instrument, opinion, report, notice, request, direction, consent, order,
bond, debenture, note, other evidence of indebtedness or other paper or
document believed by it to be genuine and to have been signed or presented
by the proper party or parties;

   (b) any request or direction of the Company mentioned herein shall
be sufficiently evidenced by a Company Request or Company Order and any
resolution of the Board of Directors may be sufficiently evidenced by a
Board Resolution;

   (c) 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;

   (d) the Trustee may consult with counsel and the written advice of
such counsel or any Opinion of Counsel shall be full and complete
authorization and protection in respect of any action taken, suffered or
omitted by it hereunder in good faith and in reliance thereon;

   (e) the Trustee shall be under no obligation to exercise any of the
rights or powers vested in it by this Indenture at the request or direction
of any of the Holders pursuant to this Indenture, unless such Holders shall
have offered to the Trustee reasonable security or indemnity against the
costs, expenses and liabilities which might be incurred by it in compliance
with such request or direction;

   (f) the Trustee shall not be bound to make any investigation into
<PAGE>

the facts or matters stated in any resolution, certificate, statement,
instrument, opinion, report, notice, request, direction, consent, order, bond,
debenture, note, other evidence of indebtedness or other document, but the
Trustee, in its discretion, may make such further inquiry or investigation into
such facts or matters as it may see fit, and, if the Trustee shall determine to
make such further inquiry or investigation, it shall be entitled to examine the
books, records and premises of the Company, personally or by agent or attorneys;

   (g) the Trustee may execute any of the trusts or powers hereunder or perform
any duties hereunder either directly or by or through agents or attorneys and
the Trustee shall not be responsible for any misconduct or negligence on the
part of any agent or attorney appointed with due care by it hereunder; and

   (h) the Trustee shall not be liable for any action taken, suffered or omitted
by it in good faith and believed by it to be authorized or within the discretion
or rights or powers conferred upon it by this Indenture.

   The Trustee shall not be required to expend or risk its own funds or
otherwise incur any financial liability in the performance of any of its duties
hereunder, 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.

SECTION 603.  NOT RESPONSIBLE FOR RECITALS OR ISSUANCE OF SECURITIES.

   The recitals contained herein and in the Securities, except the Trustee's
certificates of authentication, shall be taken as the statements of the Company,
and the Trustee or any Authenticating Agent assumes no responsibility for their
correctness. The Trustee makes no representations as to the validity or
sufficiency of this Indenture or of the Securities. The Trustee or any
Authenticating Agent shall not be accountable for the use or application by the
Company of Securities or the proceeds thereof.

SECTION 604.  MAY HOLD SECURITIES.

   The Trustee, any Authenticating Agent, any Paying Agent, any Security
Registrar or any other agent of the Company, in its individual or any other
capacity, may become the owner or pledgee of Securities and, subject to Sections
310(b) and 311 of the Trust Indenture Act, may otherwise deal with the Company
with the same rights it would have if it were not Trustee, Authenticating Agent,
Paying Agent, Security Registrar or such other agent.

SECTION 605.  MONEY HELD IN TRUST.

   Money held by the Trustee in trust hereunder need not be segregated from
other funds except to the extent required by law. The Trustee shall be under no
liability for interest on any money received by it hereunder except as otherwise
agreed with the Company.

SECTION 606.  COMPENSATION AND REIMBURSEMENT.

   The Company agrees

    (1) to pay to the Trustee from time to time reasonable
<PAGE>

  compensation for all services rendered by it hereunder (which compensation
  shall not be limited by any provision of law in regard to the compensation of
  a trustee of an express trust);

    (2) except as otherwise expressly provided herein, to reimburse the Trustee
  upon its request for all reasonable expenses, disbursements and advances
  incurred or made by the Trustee in accordance with any provision of this
  Indenture (including the reasonable compensation and the expenses and
  disbursements of its agents and counsel), except any such expense,
  disbursement or advance as may be attributable to its negligence or bad faith;
  and

    (3) to indemnify the Trustee or any predecessor Trustee for, and to hold it
  harmless against, any loss, liability or expense incurred without negligence
  or bad faith on its part, arising out of or in connection with the acceptance
  or administration of the trust or trusts hereunder, including the 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 obligations of the Company under this Section to compensate the Trustee,
to pay or reimburse the Trustee for expenses, disbursements and advances and to
indemnify and hold harmless the Trustee shall constitute additional indebtedness
hereunder and shall survive the satisfaction and discharge of this Indenture and
the removal or resignation of the Trustee. As security for the performance of
such obligations of the Company, the Trustee shall have a claim prior to the
Securities upon all property and funds held or collected by the Trustee as such,
except funds held in trust for the payment of principal of (and premium, if any)
or interest on particular Securities.

SECTION 607.  CORPORATE TRUSTEE REQUIRED; ELIGIBILITY.

   There shall at all times be a Trustee hereunder which shall be eligible to
act as Trustee under Section 310(a)(1) of the Trust Indenture Act and shall have
a combined capital and surplus of at least $50,000,000. If such corporation
publishes reports of condition at least annually, pursuant to law or to the
requirements of any Federal, State, Territorial or District of Columbia
supervising or examining authority, then for the purposes of this Section, the
combined capital and surplus of such corporation shall be deemed to be its
combined capital and surplus as set forth in its most recent report of condition
so published. If at any time the Trustee shall cease to be eligible in
accordance with the provisions of this Section, it shall resign immediately in
the manner and with the effect hereinafter specified in this Article.

SECTION 608.  RESIGNATION AND REMOVAL; APPOINTMENT OF SUCCESSOR.

   (a) No resignation or removal of the Trustee and no appointment of a
successor Trustee pursuant to this Article shall become effective until the
acceptance of appointment by the successor Trustee in accordance with the
applicable requirements of Section 609.

   (b) The Trustee may resign at any time with respect to the Securities of one
or more series by giving written notice thereof to the Company. If the
instrument of acceptance by a successor Trustee required by Section 609 shall
not have been delivered to the Trustee within 30 days after the giving of such
notice of resignation, the resigning Trustee may petition any court of competent
jurisdiction for the appointment of a successor Trustee with respect to the
Securities of such series.
<PAGE>

   (c) The Trustee may be removed at any time with respect to the Securities of
any series by Act of the Holders of a majority in principal amount of the
Outstanding Securities of such series, delivered to the Trustee and to the
Company.

   (d) If at any time:

      (1) the Trustee shall fail to comply with Section 310(b) of the Trust
  Indenture Act after written request therefor by the Company or by any Holder
  who has been a bona fide Holder of a Security for at least six months, or

      (2) the Trustee shall cease to be eligible under Section 310(a) of the
  Trust Indenture Act and shall fail to resign after written request therefor by
  the Company or by any such Holder, or

      (3) the Trustee shall become incapable of acting or shall be adjudged a
  bankrupt or insolvent or a receiver of the Trustee or of its property shall be
  appointed or any public officer shall take charge or control of the Trustee or
  of its property or affairs for the purpose of rehabilitation, conservation or
  liquidation.

then, in any such case, (i) the Company by a Board Resolution may remove the
Trustee with respect to all Securities, or (ii) subject to Section 315(e) of the
Trust Indenture Act, any Holder who has been a bona fide Holder of a Security
for at least six months may, on behalf of himself and all others similarly
situated, petition any court of competent jurisdiction for the removal of the
Trustee with respect to all Securities and the appointment of a successor
Trustee or Trustees.

   (e) If the Trustee shall resign, be removed or become incapable of acting, or
if a vacancy shall occur in the office of Trustee for any cause, with respect to
the Securities of one or more series, the Company, by a Board Resolution, shall
promptly appoint a successor Trustee or Trustees with respect to the Securities
of that or those series (it being understood that any such successor Trustee may
be appointed with respect to the Securities of one or more or all of such series
and that at any time there shall be only one Trustee with respect to the
Securities of any particular series) and shall comply with the applicable
requirements of Section 609. If, within one year after such resignation, removal
or incapability, or the occurrence of such vacancy, a successor Trustee with
respect to the Securities of any series shall be appointed by Act of the Holders
of a majority in principal amount of the Outstanding Securities of such series
delivered to the Company and the retiring Trustee, the successor Trustee so
appointed shall, forthwith upon its acceptance of such appointment in accordance
with the applicable requirements of Section 609, become the successor Trustee
with respect to the Securities of such series and to that extent supersede the
successor Trustee appointed by the Company. If no successor Trustee with respect
to the Securities of any series shall have been so appointed by the Company or
the Holders and accepted appointment in the manner required by Section 609, any
Holder who has been a bona fide Holder of a Security of such series for at least
six months may, on behalf of himself and all others similarly situated, petition
any court of competent jurisdiction for the appointment of a successor Trustee
with respect to the Securities of such series.

   (f) The Company shall give notice of each resignation and each
<PAGE>

removal of the Trustee with respect to the Securities of any series and
each appointment of a successor Trustee with respect to the Securities of
any series by mailing written notice of such event by first-class mail,
postage prepaid, to all Holders of Securities of such series as their names
and addresses appear in the Security Register. Each notice shall include
the name of the successor Trustee with respect to the Securities of such
series and the address of its Corporate Trust Office.

SECTION 609.  ACCEPTANCE OF APPOINTMENT BY SUCCESSOR.

   (a) In case of the appointment hereunder of a successor Trustee
with respect to all Securities, every such successor Trustee so appointed
shall execute, acknowledge and deliver to the Company and to the retiring
Trustee an instrument accepting such appointment, and thereupon the
resignation or removal of the retiring Trustee shall become effective and
such successor Trustee, without any further act, deed or conveyance, shall
become vested with all the rights, powers, trusts and duties of the
retiring Trustee; but, on the request of the Company or the successor
Trustee, such retiring Trustee shall, upon payment of its charges, execute
and deliver an instrument transferring to such successor Trustee all the
rights, powers and trusts of the retiring Trustee and shall duly assign,
transfer and deliver to such successor Trustee all property and money held
by such retiring Trustee hereunder.

   (b) In case of the appointment hereunder of a successor Trustee
with respect to the Securities of one or more (but not all) series, the
Company, the retiring Trustee and each successor Trustee with respect to
the Securities of one or more series shall execute and deliver an indenture
supplemental hereto wherein each successor Trustee shall accept such
appointment and which (1) shall contain such provisions as shall be
necessary or desirable to transfer and confirm to, and to vest in, each
successor Trustee all the rights, powers, trusts and duties of the retiring
Trustee with respect to the Securities of that or those series to which the
appointment of such successor Trustee relates, (2) if the retiring Trustee
is not retiring with respect to all Securities, shall contain such
provisions as shall be deemed necessary or desirable to confirm that all
the rights, powers, trusts and duties of the retiring Trustee with respect
to the Securities of that or those series as to which the retiring Trustee
is not retiring shall continue to be vested in the retiring Trustee, and
(3) shall add to or change any of the provisions of this Indenture as shall
be necessary to provide for or facilitate the administration of the trusts
hereunder by more than one Trustee, it being understood that nothing herein
or in such supplemental indenture shall constitute such Trustees cotrustees
of the same trust and that each such Trustee shall be trustee of a trust or
trusts hereunder separate and apart from any trust or trusts hereunder
administered by any other such Trustee; and upon the execution and delivery
of such supplemental indenture the resignation or removal of the retiring
Trustee shall become effective to the extent provided therein and each such
successor Trustee, without any further act, deed or conveyance, shall
become vested with all the rights, powers, trusts and duties of the
retiring Trustee with respect to the Securities of that or those series to
which the appointment of such successor Trustee relates; but, on request of
the Company or any successor Trustee, such retiring Trustee shall duly
assign, transfer and deliver to such successor Trustee all property and
money held by such retiring Trustee hereunder with respect to the
Securities of that or those series to which the appointment of such
successor Trustee relates.
<PAGE>

   (c) Upon request of any such successor Trustee, the Company shall execute any
and all instruments necessary to more fully and certainly vest in and confirm to
such successor Trustee all such rights, powers and trusts referred to in
paragraph (a) or (b) of this Section, as the case may be.

   (d) No successor Trustee shall accept its appointment unless at the time of
such acceptance such successor Trustee shall be qualified and eligible under
this Article.

SECTION 610.  MERGER, CONVERSION, CONSOLIDATION OR SUCCESSION TO
              BUSINESS.

   Any corporation into which the Trustee may be merged or converted or with
which it may be consolidated, or any corporation resulting from any merger,
conversion or consolidation to which the Trustee shall be a party, or any
corporation succeeding to all or substantially all the corporate trust business
of the Trustee, shall be the successor of the Trustee hereunder, provided such
corporation shall be otherwise qualified and eligible under this Article,
without the execution or filing of any paper or any further act on the part of
any of the parties hereto. In case any Securities shall have been authenticated,
but not delivered, by the Trustee then in the office, any successor by merger,
conversion or consolidation to such authenticating Trustee may adopt such
authentication and deliver the Securities so authenticated with the same effect
as if such successor Trustee had itself authenticated such Securities.

SECTION 611.  APPOINTMENT OF AUTHENTICATING AGENT.

   At any time when any of the Securities remain Outstanding the Trustee may
appoint an Authenticating Agent or Agents with respect to one or more series of
Securities which shall be authorized to act on behalf of the Trustee to
authenticate Securities of such series issued upon exchange, registration of
transfer or partial redemption thereof or pursuant to Section 306, and
Securities so authenticated shall be entitled to the benefits of this Indenture
and shall be valid and obligatory for all purposes as if authenticated by the
Trustee hereunder. Wherever reference is made in this Indenture to the
authentication and delivery of Securities by the Trustee or the Trustee's
certificate of authentication, such reference shall be deemed to include
authentication and delivery on behalf of the Trustee by an Authenticating Agent
and a certificate of authentication executed on behalf of the Trustee by an
Authenticating Agent. Each Authenticating Agent shall be acceptable to the
Company and shall at all times be a corporation organized and doing business
under the laws of the United States of America, any State thereof or the
District of Columbia, authorized under such laws to act as Authenticating Agent,
having a combined capital and surplus of not less than $50,000,000 and subject
to supervision or examination by Federal or State authority. If such
Authenticating Agent publishes reports of condition at least annually, pursuant
to law or to the requirements of said supervising or examining authority, then
for the purposes of this Section, the combined capital and surplus of such
Authenticating Agent shall be deemed to be its combined capital and surplus as
set forth in its most recent report of condition so published. If at any time an
Authenticating Agent shall cease to be eligible in accordance with the
provisions of this Section, such Authenticating Agent shall resign immediately
in the manner and with the effect specified in this Section.

   Any corporation into which an Authenticating Agent may be merged or converted
or with which it may be consolidated, or any corporation resulting from any
merger, conversion or consolidation to which such
<PAGE>

Authenticating Agent shall be a party, or any corporation succeeding to the
corporate agency or corporate trust business of an Authenticating Agent,
shall continue to be an Authenticating Agent, provided such corporation
shall be otherwise eligible under this Section, without the execution or
filing of any paper or any further act on the part of the Trustee or the
Authenticating Agent.

   An Authenticating Agent may resign at any time by giving written
notice thereof to the Trustee and to the Company. The Trustee may at any
time terminate the agency of an Authenticating Agent by giving written
notice thereof to such Authenticating Agent and to the Company. Upon
receiving such a notice of resignation or upon such a termination, or in
case at any time such Authenticating Agent shall cease to be eligible in
accordance with the provisions of this Section, the Trustee may appoint a
successor Authenticating Agent which shall be acceptable to the Company and
shall mail written notice of such appointment by first-class mail, postage
prepaid, to all Holders of Securities of the series with respect to which
such Authenticating Agent will serve, as their names and addresses appear
in the Security Register. Any successor Authenticating Agent upon
acceptance of its appointment hereunder shall become vested with all the
rights, powers and duties of its predecessor hereunder, with like effect as
if originally named as an Authenticating Agent. No successor Authenticating
Agent shall be appointed unless eligible under the provisions of this
Section.

   The Company agrees to pay to each Authenticating Agent from time to
time reasonable compensation for its services under this Section.

   If an appointment with respect to one or more series is made
pursuant to this Section, the Securities of such series may have endorsed
thereon, in addition to the Trustee's certificate of authentication, an
alternate certificate of authentication in the following form:

   "This is one of the Securities of the series designated
therein referred to in the within-mentioned Indenture.

                                    FIRST UNION NATIONAL BANK,
                                    As Trustee

                                    By____________________________
                                        As Authenticating Agent

                                    By____________________________
                                          Authorized Officer"

                                 ARTICLE SEVEN

               HOLDERS' LISTS AND REPORTS BY TRUSTEE AND COMPANY

SECTION 701.  DISCLOSURE OF NAMES AND ADDRESSES OF HOLDERS.

   Every Holder of Securities, by receiving and holding the same,
agrees with the Company and the Trustee that neither the Company nor the
Trustee nor any agent of either of them shall be held accountable by reason
of the disclosure of any such information as to the names and addresses of
the Holders in accordance with Section 312 of the Trust Indenture Act,
regardless of the source from which such information was derived, and that
the Trustee shall not be held accountable by reason of mailing any material
pursuant to a request made under Section 312(b) of the Trust Indenture Act.
<PAGE>

SECTION 702.  REPORTS BY TRUSTEE.

   Within 60 days after December 1 of each year commencing with the
first December 1 after the first issuance of securities pursuant to this
Indenture, the Trustee shall transmit to the Holders of Securities, in the
manner provided in Section 313(c) of the Trust Indenture Act, a brief
report dated as of December 1 of such year if required by Section 313(a) of
the Trust Indenture Act.

SECTION 703.  REPORTS BY COMPANY AND HOLDERS' LISTS.

   The Company shall:

    (1) file with the Trustee, within 15 days after the Company is
  required to file the same with the Commission, copies of the annual
  reports and of the information, documents and other reports (or copies
  of such portions of any of the foregoing as the Commission may from
  time to time by rules and regulations prescribe) which the Company may
  be required to file with the Commission pursuant to Section 13 or
  Section 15(d) of the Securities Exchange Act of 1934; or, if the
  Company is not required to file information, documents or reports
  pursuant to either of such Sections, then it shall file with the
  Trustee and the Commission, in accordance with rules and regulations
  prescribed from time to time by the Commission, such of the
  supplementary and periodic information, documents and reports which
  may be required pursuant to Section 13 of the Securities Exchange Act
  of 1934 in respect of a security listed and registered on a national
  securities exchange as may be prescribed from time to time in such
  rules and regulations;

    (2) file with the Trustee and the Commission, in accordance
  with rules and regulations prescribed from time to time by the
  Commission, such additional information, documents and reports with
  respect to compliance by the Company with the conditions and covenants
  of this Indenture as may be required from time to time by such rules
  and regulations;

    (3) transmit to all Holders, in the manner and to the extent
  provided in Section 313(c) of the Trust Indenture Act, within 30 days
  after the filing thereof with the Trustee, such summaries of any
  information, documents and reports required to be filed by the Company
  pursuant to paragraphs (1) and (2) of this Section as may be required
  by rules and regulations prescribed from time to time by the
  Commission; and

    (4) furnish or cause to be furnished to the Trustee (a) not
  more than 15 days after each Regular Record Date as defined in Section
  101, but in any event not less frequently than semi-annually, a list
  in such form as the Trustee may reasonably require, containing all the
  information in the possession or control of the Company or any of its
  Paying Agents other than the Trustee, as to the names and addresses of
  the Holders of Securities to which such Regular Record Date applies as
  of such Regular Record Date, and (b) at such other times as the
  Trustee may request in writing, within 30 days after receipt by the
  Company of any such request, a list of similar form and content as of
  a date not more than 15 days prior to the time such list is furnished,
  excluding from any such list names and addresses received by the
<PAGE>

  Trustee in its capacity as Security Registrar. The Trustee shall preserve, in
  as current a form as is reasonably practicable, the names and addresses of
  Holders contained in the most recent list furnished to the Trustee as provided
  in this Section and the names and addresses of Holders received by the Trustee
  in its capacity as Securities Registrar. The Trustee may destroy any list
  furnished to it as provided in this Section upon receipt of a new list so
  furnished.

                                 ARTICLE EIGHT

             CONSOLIDATION, MERGER, CONVEYANCE, TRANSFER OR LEASE

SECTION 801.  COMPANY MAY CONSOLIDATE, ETC., ONLY ON CERTAIN TERMS.

   The Company shall not consolidate with or merge into any other corporation or
convey, transfer or lease its properties and assets substantially as an entirety
to any Person unless:

    (1) in case the Company shall consolidate with or merge into another
  corporation or convey, transfer or lease its properties and assets
  substantially as an entirety to any Person, the corporation formed by such
  consolidation or into which the Company is merged or the Person which acquires
  by conveyance or transfer, or which leases, the properties and assets of the
  Company substantially as an entirety shall be a corporation organized and
  existing under the laws of the United States of America, any state thereof or
  the District of Columbia and shall expressly assume, by an indenture
  supplemental hereto, executed and delivered to the Trustee, in form reasonably
  satisfactory to the Trustee, the due and punctual payment of the principal of
  (and premium, if any) and interest on all the Securities and the performance
  of every covenant of this Indenture on the part of the Company to be performed
  or observed;

    (2) immediately after giving effect to such transaction and treating any
  indebtedness which becomes an obligation of the Company as a result of such
  transaction as having been incurred by the Company at the time of such
  transaction, no Event of Default, and no event which, after notice or lapse of
  time or both, would become an Event of Default, shall have happened and be
  continuing; and

    (3) the Company has delivered to the Trustee an Officers' Certificate and an
  Opinion of Counsel, each stating that such consolidation, merger, conveyance,
  transfer or lease and, if a supplemental indenture is required with such
  transaction, such supplemental indenture comply with this Article and that all
  conditions precedent herein provided for relating to such transaction have
  been complied with.

SECTION 802.  SUCCESSOR CORPORATION SUBSTITUTED.

   Upon any consolidation by the Company with or merger by the Company into any
other corporation or any conveyance, transfer or lease of the properties and
assets of the Company substantially as an entirety in accordance with Section
801, the successor corporation formed by such consolidation or into which the
Company is merged or to which such conveyance, transfer or lease is made shall
succeed to, and be substituted for, and may exercise every right and power of,
the Company under this Indenture with the same effect as if such successor
corporation had been
<PAGE>

named as the Company herein, and thereafter, except in the case of a lease, the
predecessor corporation shall be relieved of all obligations and covenants under
this Indenture and the Securities.

                                 ARTICLE NINE

                            SUPPLEMENTAL INDENTURES

SECTION 901.  SUPPLEMENTAL INDENTURES WITHOUT CONSENT OF HOLDERS.

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

    (1) to evidence the succession of another corporation to the Company and the
  assumption by any such successor of the covenants of the Company herein and in
  the Securities; or

    (2) to add to the covenants of the Company for the benefit of the Holders of
  all or any series of Securities (and if such covenants are to be for the
  benefit of less than all series of Securities, stating that such covenants are
  expressly being included solely for the benefit of such series) or to
  surrender any right or power herein conferred upon the Company; or

    (3) to add any additional Events of Default (and if such Events of Default
  are to be for the benefit of less than all series of Securities, stating that
  such Events of Default are being included solely for the benefit of such
  series); or

    (4) to add to or to change any of the provisions of this Indenture to such
  extent as shall be necessary to permit or facilitate the issuance of
  Securities in bearer form, registrable or not registrable as to principal, and
  with or without interests coupons; or

    (5) to change or eliminate any of the provisions of this Indenture, provided
  that any such change or elimination shall become effective only when there is
  no Security Outstanding of any series created prior to the execution of such
  supplemental indenture which is entitled to the benefit of such provision; or

    (6) to secure the Securities pursuant to the requirements of Section 1007;
  or

    (7) to establish the form or terms of Securities of any series as permitted
  by Sections 201 and 301; or

    (8) to evidence and provide for the acceptance of appointment hereunder by a
  successor Trustee with respect to the Securities of one or more series and to
  add to or change any of the provisions of this Indenture as shall be necessary
  to provide for or facilitate the administration of the trusts hereunder by
  more than one Trustee, pursuant to the requirements of Section 609(b); or

    (9) to cure any ambiguity, to correct or supplement any provision herein
  which may be inconsistent with any other provision herein, or to make any
  other provisions with respect to matters or
<PAGE>

  questions arising under this Indenture, provided such action shall not
  adversely affect the interests of the Holders of Securities of any series in
  any material respect.

SECTION 902.  SUPPLEMENTAL INDENTURES WITH CONSENT OF HOLDERS.

   With the consent of the Holders of not less than a majority in principal
amount of the Outstanding Securities of each series affected by such
supplemental indenture, by Act of said Holders delivered to the Company and the
Trustee, the Company, when authorized by a Board Resolution, and the Trustee may
enter into an indenture or indentures supplemental hereto for the purpose of
adding any provisions to this Indenture or of modifying in any manner the rights
of the Holders of Securities of such series under this Indenture; provided,
however, that no such supplemental indenture shall, without the consent of the
Holder of each Outstanding Security affected thereby,

    (1) change the Stated Maturity of the principal of, or any installment of
  principal of or interest on, any Security, or reduce the principal amount
  thereof or the rate of interest thereon or any premium payable upon the
  redemption thereof, or reduce the amount of the principal of an Original Issue
  Discount Security that would be due and payable upon a declaration of
  acceleration of the Maturity thereof pursuant to Section 502 or the amount
  thereof payable in bankruptcy pursuant to Section 504, or adversely affect any
  right of repayment at the option of any Holder of any Security, or the
  Currency in which any Security or any premium or 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, on or
  after the Redemption Date), or

    (2) reduce the percentage in principal amount of the Outstanding Securities
  of any series, the consent of whose Holders is required for any such
  supplemental indenture, or the consent of whose Holders is required for any
  waiver (of compliance with certain provisions of this Indenture or certain
  defaults hereunder and their consequences) provided for in this Indenture, or

    (3) modify any of the provisions of this Section, Section 513 or Section
  1010, except to increase any such 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 Security affected thereby, provided,
  however, that this clause shall not be deemed to require the consent of any
  Holder with respect to changes in the references to "the Trustee" and
  concomitant changes in this Section and Section 1010 or the deletion of this
  proviso, in accordance with the requirements of Sections 609(b) and 901(8).

A supplemental indenture which changes or eliminates any covenant or other
provision of this Indenture which has expressly been included solely for the
benefit of one or more particular series of Securities, or which modifies the
rights of the Holders of Securities of such series with respect to such covenant
or other provision, shall be deemed not to affect the rights under this
Indenture of the Holders of Securities of any other series.

   It shall not be necessary for any Act of Holders under this Section to
approve the particular form of any proposed supplemental indenture, but it shall
be sufficient if such Act shall approve the substance thereof.
<PAGE>

   The Company may, but shall not be obligated to, fix a record date for the
purpose of determining the Persons entitled to consent to any indenture
supplemental hereto. If a record date is fixed, the Holders on such record date
or their duly designated proxies, and only such Persons, shall be entitled to
consent to such supplemental indenture or to revoke (prior to the requisite
percentage for such consent to become effective having been obtained) any such
consent previously given, whether or not such Holders remain Holders after such
record date; provided, that unless such consent shall have become effective by
virtue of such requisite percentage having been obtained prior to the date which
is 90 days after such record date, such consent shall, automatically and without
further action by the Holder, be canceled and of no further force or effect.

SECTION 903.  EXECUTION OF SUPPLEMENTAL INDENTURES.

   In executing, or accepting the additional trusts created by, any supplemental
indenture permitted by this Article or the modifications thereby of the trusts
created by 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 such supplemental indenture is authorized or permitted by this
Indenture. The Trustee may, but shall not be obligated to, enter into any such
supplemental indenture which affects the Trustee's own rights, duties or
immunities under this Indenture or otherwise.

SECTION 904.  EFFECT OF SUPPLEMENTAL INDENTURES.

   Upon the execution of a supplemental indenture under this Article, this
Indenture shall be modified in accordance therewith, and such supplemental
indenture shall form a part of this Indenture for all purposes; and every Holder
of Securities theretofore or thereafter authenticated and delivered hereunder
shall be bound thereby.

SECTION 905.  CONFORMITY WITH TRUST INDENTURE ACT.

   Every supplemental indenture executed pursuant to this Article shall conform
to the requirements of the Trust Indenture Act as then in effect.

SECTION 906.  REFERENCE IN SECURITIES TO SUPPLEMENTAL INDENTURES.

   Securities of any series authenticated and delivered after the execution of
any supplemental indenture pursuant to this Article may, and shall if required
by the Trustee, bear a notation in form approved by the Trustee as to any matter
provided for in such supplemental Indenture. If the Company shall so determine,
new Securities of any series so modified as to conform, in the opinion of the
Trustee and the Company, to any such supplemental indenture may be prepared and
executed by the Company and authenticated and delivered by the Trustee in
exchange for Outstanding Securities of such series.

                                  ARTICLE TEN

                                   COVENANTS

SECTION 1001.  PAYMENT OF PRINCIPAL, PREMIUM AND INTEREST.
<PAGE>

   The Company covenants and agrees for the benefit of each series of
Securities that it will duly and punctually pay the principal of (and premium,
if any) and interest on the Securities of that series in accordance with the
terms of the Securities and this Indenture.

SECTION 1002.  MAINTENANCE OF OFFICE OR AGENCY.

   The Company will maintain or cause to be maintained in each Place of Payment
for any series of Securities an office or agency where Securities of that series
may be presented or surrendered for payment, where Securities of that series may
be surrendered for registration of transfer or exchange and where notices and
demands to or upon the Company in respect of the Securities of that series and
this Indenture may be served, and the Company hereby initially appoints the
Corporate Trust Office of the Trustee as its agent to receive all such
presentations, surrenders, notices and demands. The Company will give prompt
written notice to the Trustee of the location, and any change in the location,
of such office or agency. If at any time the Company shall fail to maintain any
such required office or agency or shall fail to furnish the Trustee with the
address thereof, such presentations, surrenders, notices and demands may be made
or served at the Corporate Trust Office of the Trustee, and the Company hereby
appoints the Trustee as its agent to receive all such presentations, surrenders,
notices and demands.

   The Company may also from time to time designate one or more other offices or
agencies where the Securities of one or more series 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 of its obligation to maintain an office or agency
in each Place of Payment for Securities of any series for such purposes. The
Company will give prompt written notice to the Trustee of any such designation
or rescission and of any change in the location of any such other office or
agency.

   Unless otherwise specified with respect to any Securities pursuant to Section
301, if and so long as the Securities of any series (i) are denominated in a
Currency other than Dollars or (ii) may be payable in a Currency other than
Dollars, or if so required under any other provision of the Indenture, then the
Company will maintain with respect to each such series of Securities, or as so
required, at least one Exchange Rate Agent.

SECTION 1003.  MONEY FOR SECURITIES PAYMENTS TO BE HELD IN TRUST.

   If the Company shall at any time act as its own Paying Agent with respect to
any series of Securities, it will, on or before each due date of the principal
of (and premium, if any) or interest on any of the Securities of that series,
segregate and hold in trust for the benefit of the Persons entitled thereto a
sum in the Currency in which the Securities of such series are payable (except
as otherwise specified pursuant to Section 301 for the Securities of such
series) sufficient to pay the principal (and premium, if any) or interest so
becoming due until such sums shall be paid to such Persons or otherwise disposed
of as herein provided and will promptly notify the Trustee of its action or
failure so to act.

   Whenever the Company shall have one or more Paying Agents for any series of
Securities, it will, prior to each due date of the principal of (and premium, if
any) or interest on any Securities of that series, deposit with a Paying Agent a
sum (in the Currency described in the preceding paragraph) sufficient to pay the
principal (and premium, if any) or
<PAGE>

interest so becoming due, such sum to be held in trust for the benefit of the
Persons entitled to such principal, premium or interest, and (unless such Paying
Agent is the Trustee) the Company will promptly notify the Trustee of its action
or failure so to act.

   The Company will cause each Paying Agent (other than the Trustee) for any
series of Securities other than the Trustee to execute and deliver to the
Trustee an instrument in which such Paying Agent shall agree with the Trustee,
subject to the provisions of this Section, that such Paying Agent will:

    (1) hold all sums held by it for the payment of the principal of (and
  premium, if any) or interest on Securities of that series in trust for the
  benefit of the Persons entitled thereto until such sums shall be paid to such
  Persons or otherwise disposed of as herein provided;

    (2) give the Trustee notice of any default by the Company (or any other
  obligor upon the Securities of that series) in the making of any payment of
  principal (and premium, if any) or interest on the Securities of that series;
  and

    (3) at any time during the continuance of any such default, upon the written
  request of the Trustee, forthwith pay to the Trustee all sums so held in trust
  by such Paying Agent.

   The Company may at any time, for the purpose of obtaining the satisfaction
and discharge of this Indenture or for any other purpose, pay, or by Company
Order direct any Paying Agent to pay, to the Trustee all sums held in trust by
the Company or such Paying Agent, such sums to be held by the Trustee upon the
same trusts as those upon which such sums were held by the Company or such
Paying Agent; and, upon such payment by any Paying Agent to the Trustee, such
Paying Agent shall be released from all further liability with respect to such
money.

   Any money or U.S. Government Obligations deposited with the Trustee or any
Paying Agent, or then held by the Company, in trust for the payment of the
principal of (and premium, if any) or interest on any Security of any series and
remaining unclaimed for three years after such principal (and premium, if any)
or interest has become due and payable shall be paid to the Company on Company
Request or (if then held by the Company) shall be discharged from such trust;
and the Holder of such Security shall thereafter, as an unsecured general
creditor, look only to the Company for payment thereof, and all liability of the
Trustee or such Paying Agent with respect to such trust money, and all liability
of the Company as trustee thereof, shall thereupon cease, provided, however,
that the Trustee or such Paying Agent, before being required to make any such
repayment, may (but shall not be obligated to) at the expense of the Company
cause to be published once, in a newspaper published in an official language of
the country of publication or the English language, customarily published on
each Business Day and of general circulation in each Place of Payment 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 publication, any
unclaimed balance of such money then remaining will be repaid to the Company.
<PAGE>

SECTION 1004.  CORPORATE EXISTENCE.

   Subject to Article Eight, the Company will do or cause to be done all things
necessary to preserve and keep in full force and effect its corporate existence
and that of each Subsidiary and the rights (charter and statutory) and
franchises of the Company and its Subsidiaries; provided, however, that the
Company shall not be required to preserve any such right or franchise or to
retain any Subsidiary if the Company shall determine that the preservation or
retention thereof is no longer desirable in the conduct of the business of the
Company and its Subsidiaries considered as a whole and that the loss thereof is
not disadvantageous in any material respect to the Holders.

SECTION 1005.  MAINTENANCE OF PROPERTIES.

   The Company will cause all properties owned or leased by the Company or any
Subsidiary and used in the conduct of its business or the business of any
Subsidiary to be maintained and kept in such condition, repair and working order
and supplied with such equipment and will cause to be made such repairs,
renewals, replacements, betterments and improvements thereof, all as in the
judgment of the Company may be necessary or appropriate in the performance of
its business, provided, however, that nothing in this Section shall prevent the
Company from discontinuing the operation and maintenance of any of such
properties, or disposing of any of them, if such discontinuance or disposal is,
in the judgment of the Company or of the Subsidiary concerned, desirable in the
conduct of its business or the business of any Subsidiary and not
disadvantageous in any material respect to the Holders.

SECTION 1006.  PAYMENT OF TAXES AND OTHER CLAIMS.

   The Company will pay or discharge or cause to be paid or discharged, before
the same shall become delinquent, (1) all material taxes, assessments and
governmental charges levied or imposed upon the Company or any Subsidiary or
upon the income, profits or property of the Company or any Subsidiary, and (2)
all material lawful claims for labor, materials and supplies which, if unpaid,
might by law become a lien upon the property of the Company or any Subsidiary;
provided, however, that the Company shall not 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 or otherwise and the Company shall have set aside on its
books adequate reserves with respect thereto (if and to the extent required by
generally accepted accounting principles).

SECTION 1007.  LIMITATIONS ON LIENS.

   The Company will not, and will not permit any Subsidiary to, directly or
indirectly, create, issue, assume, incur or guarantee any indebtedness for
borrowed money which is secured by a Mortgage of any nature on any of the
present or future capital stock of any Restricted Subsidiary (or any
corporation, other than the Company, having direct or indirect control of any
Restricted Subsidiary) unless the Securities then Outstanding shall be secured
equally and ratably with or prior to such other secured debt so long as it is
outstanding.

SECTION 1008.  LIMITATIONS ON DISPOSITION OF STOCK OF RESTRICTED
               SUBSIDIARIES.

   The Company will not, and will not permit any Subsidiary to, sell, transfer
or otherwise dispose of any shares of capital stock of any Restricted Subsidiary
(or of any corporation having direct or indirect
<PAGE>

control of any Restricted Subsidiary) except for, subject to Article Eight (i) a
sale, transfer or other disposition of any capital stock of any Restricted
Subsidiary to a wholly-owned Subsidiary of the Company; (ii) a sale, transfer or
other disposition of the entire capital stock of any Restricted Subsidiary for
at least fair value (as determined by the Board of Directors of the Company
acting in good faith); or (iii) a sale, transfer or other disposition of the
capital stock of any Restricted Subsidiary for at least fair value (as
determined by the Board of Directors of the Company acting in good faith) if,
after giving effect thereto, the Company and its Subsidiaries would own more
than 80% of the issued and outstanding voting Stock of such Restricted
Subsidiary.

SECTION 1009.  STATEMENT AS TO COMPLIANCE.

   The Company will deliver to the Trustee, by May 1 of each year, a certificate
from the principal executive officer, principal financial officer or principal
accounting officer of the Company, stating, as to each signer thereof, that

    (1) a review of the activities of the Company during such year and of
  performance under this Indenture has been made under his supervision, and

    (2) to the best of his knowledge, based on such review, (a) the Company has
  fulfilled all its obligations under this Indenture throughout such year, or,
  if there has been a default in the fulfillment of any such obligation,
  specifying each such default known to him and the nature and status thereof,
  and (b) no event has occurred and is continuing which is, or after notice or
  lapse of time or both would become, an Event of Default, or, if such an event
  has occurred and is continuing, specifying each such event known to him and
  the nature and status thereof.

SECTION 1010.  WAIVER OF CERTAIN COVENANTS.

   The Company may omit in any particular instance to comply with any term,
provision or condition set forth in Sections 1004 to 1008, inclusive, with
respect to the Securities of all series if before the time for such compliance
the Holders of at least a majority in principal amount of the Outstanding
Securities of all series shall, by Act of such Holders, either waive such
compliance in such instance or generally waive compliance with such term,
provision or condition, but no such waiver shall extend to or affect such term,
provision or condition except to the extent so expressly waived, and, until such
waiver shall become effective, the obligations of the Company and the duties of
the Trustee in respect of any such term, provision or condition shall remain in
full force and effect.

                                ARTICLE ELEVEN

                           REDEMPTION OF SECURITIES

SECTION 1101.  APPLICABILITY OF ARTICLE.

   Securities of any series which are redeemable before their Stated Maturity
shall be redeemable in accordance with their terms and (except as otherwise
specified as contemplated by Section 301 for Securities of any series) in
accordance with this Article.
<PAGE>

SECTION 1102.  ELECTION TO REDEEM; NOTICE TO TRUSTEE.

   The election of the Company to redeem any Securities shall be evidenced by a
Board Resolution and Company Order. In case of any redemption at the election of
the Company of less than all the Securities of any series, the Company shall, at
least 60 days prior to the Redemption Date fixed by the Company (unless a
shorter notice shall be satisfactory to the Trustee), notify the Trustee of such
Redemption Date and of the principal amount of Securities of such series to be
redeemed. In the case of any redemption of Securities prior to the expiration of
any restriction on such redemption provided in the terms of such Securities or
elsewhere in this Indenture, the Company shall furnish the Trustee with an
Officers' Certificate evidencing compliance with such restriction.

SECTION 1103.  SELECTION BY TRUSTEE OF SECURITIES TO BE REDEEMED.

   If less than all the Securities of any series with the same issue date,
interest rate and Stated Maturity are to be redeemed, the particular Securities
to be redeemed shall be selected not more than 60 days prior to the Redemption
Date by the Trustee, from the Outstanding Securities of such series not
previously called for redemption, by such method as the Trustee shall deem fair
and appropriate and which may provide for the selection for redemption of
portions (equal to the minimum authorized denomination for Securities of that
series or any integral multiple thereof) of the principal amount of Securities
of such series of a denomination larger than the minimum authorized denomination
for Securities of that series.

   The Trustee shall promptly notify the Company in writing of the Securities
selected for redemption and, in the case of any Securities selected for partial
redemption, the principal amount thereof to be redeemed.

   For all purposes of this Indenture, unless the context otherwise requires,
all provisions relating to the redemption of Securities shall relate, in the
case of any Securities redeemed or to be redeemed only in part, to the portion
of the principal amount of such Securities which has been or is to be redeemed.

SECTION 1104.  NOTICE OF REDEMPTION.

   Notice of redemption shall be given by first-class mail, postage prepaid,
mailed not less than 30 nor more than 60 days prior to the Redemption Date, to
each Holder of Securities to be redeemed, at his address appearing in the
Security Register.

   All notices of redemption shall state:

    (1) the Redemption Date,

    (2) the Redemption Price,

    (3) if less than all the Outstanding Securities of any series are to be
  redeemed, the identification (and, in the case of partial redemption, the
  principal amounts) of the particular Securities to be redeemed,

    (4) that on the Redemption Date the Redemption Price (together with accrued
  interest, if any, to the Redemption Date payable as provided in Section 1106)
  will become due and payable upon each such
<PAGE>

  Security to be redeemed and, if applicable, that interest thereon will
  cease to accrue on and after said date,

    (5) the place or places where such Securities are to be surrendered for
  payment of the Redemption Price, and

    (6) that the redemption is for a sinking fund, if such is the case.

   Notice of redemption of Securities to be redeemed at the election of the
Company shall be given by the Company or, at the Company's request, by the
Trustee in the name and at the expense of the Company.

SECTION 1105.  DEPOSIT OF REDEMPTION PRICE.

   Not later than one Business Day prior to any Redemption Date, the Company
shall deposit with the Trustee or with a Paying Agent (or, if the Company is
acting as its own Paying Agent, segregate and hold in trust as provided in
Section 1003) an amount of money in the Currency in which the Securities of such
series are payable (except as otherwise specified pursuant to Section 301 for
the Securities of such series) sufficient to pay the Redemption Price of, and
(except if the Redemption Date shall be an Interest Payment Date) accrued
interest on, all the Securities which are to be redeemed on that date.

SECTION 1106.  SECURITIES PAYABLE ON REDEMPTION DATE.

   Notice of redemption having been given as aforesaid, the Securities so to be
redeemed shall, on the Redemption Date, become due and payable at the Redemption
Price therein specified in the Currency in which the Securities of such series
are payable (except as otherwise specified pursuant to Section 301 for the
Securities of such series), and from and after such date (unless the Company
shall default in the payment of the Redemption Price and accrued interest) such
Securities shall cease to bear interest. Upon surrender of any such Security for
redemption in accordance with said notice, such Security shall be paid by the
Company at the Redemption Price, together with accrued interest to the
Redemption Date; provided, however, that installments of interest whose Stated
Maturity is on or prior to the Redemption Date shall be payable to the Holders
of such Securities, or one or more Predecessor Securities, registered as such at
the close of business on the relevant Record Dates according to their terms and
the provisions of Section 307.

   If any Security called for redemption shall not be so paid upon surrender
thereof for redemption, the principal (and premium, if any) shall, until paid,
bear interest from the Redemption Date at the rate prescribed therefor in the
Security.

SECTION 1107.  SECURITIES REDEEMED IN PART.

   Any Security (including any Global Security) which is to be redeemed only in
part shall be surrendered at a Place of Payment therefor (with, if the Company
or the Trustee so requires, due endorsement by, or a written instrument of
transfer in form satisfactory to the Company and the Trustee duly executed by,
the Holder thereof or his attorney duly authorized in writing), and the Company
shall execute, and the Trustee shall authenticate and deliver to the Holder of
such Security without service charge, a new Security or Securities of the same
series, of any authorized denomination as requested by such Holder, in aggregate
principal
<PAGE>

amount equal to and in exchange for the unredeemed portion of the principal of
the Security so surrendered; provided, that if a Global Security is so
surrendered, the new Global Security shall be in a denomination equal to the
unredeemed portion of the principal of the Global Security so surrendered.

                                ARTICLE TWELVE

                                 SINKING FUNDS

SECTION 1201.  APPLICABILITY OF ARTICLE.

   Retirements of Securities of any series pursuant to any sinking fund shall be
made in accordance with the terms of such Securities and (except as otherwise
specified as contemplated by Section 301 for Securities of any series) in
accordance with this Article.

   The minimum amount of any sinking fund payment provided for by the terms of
Securities of any series is herein referred to as a "mandatory sinking fund
payment," and any payment in excess of such minimum amount provided for by the
terms of Securities of any series is herein referred to as an "optional sinking
fund payment." If provided for by the terms of Securities of any series, the
cash amount of any mandatory sinking fund payment may be subject to reduction as
provided in Section 1202. Each sinking fund payment shall be applied to the
redemption of Securities of any series as provided for by the terms of
Securities of such series.

SECTION 1202.  SATISFACTION OF SINKING FUND PAYMENTS WITH SECURITIES.

   Subject to Section 1203, in lieu of making all or any part of any mandatory
sinking fund payment with respect to any Securities of a series in cash, the
Company may at its option (1) deliver to the Trustee Outstanding Securities of a
series (other than any previously called for redemption) theretofore purchased
or otherwise acquired by the Company, and/or (2) receive credit for the
principal amount of Securities of such series which have been previously
delivered to the Trustee by the Company or for Securities of such series which
have been redeemed either at the election of the Company pursuant to the terms
of such Securities or through the application of permitted optional sinking fund
payments pursuant to the terms of such Securities, in each case in satisfaction
of all or any part of any mandatory sinking fund payment with respect to the
Securities of the same series required to be made pursuant to the terms of such
Securities as provided for by the terms of such series; provided, however, that
such Securities have not been previously so credited. Such Securities shall be
received and credited for such purpose by the Trustee at the Redemption Price
specified in such Securities for redemption through operation of the sinking
fund and the amount of such mandatory sinking fund payment shall be reduced
accordingly.

SECTION 1203.  REDEMPTION OF SECURITIES FOR SINKING FUND.

   Not less than 60 days prior to each sinking fund payment date for any series
of Securities, the Company will deliver to the Trustee an Officers' Certificate
specifying the amount of the next ensuing sinking fund payment for that series
pursuant to the terms of that series, the portion thereof, if any, which is to
be satisfied by payment of cash in the Currency in which the Securities of such
series are payable (except as
<PAGE>

otherwise specified pursuant to Section 301 for the Securities of such series)
and the portion thereof, if any, which is to be satisfied by delivering or
crediting Securities of that series pursuant to Section 1202 (which Securities
will, if not previously delivered, accompany such certificate) and whether the
Company intends to exercise its right to make a permitted optional sinking fund
payment with respect to such series. Such certificate shall be irrevocable and
upon its delivery the Company shall be obligated to make the cash payment or
payments therein referred to, if any, not later than one Business Day before the
next succeeding sinking fund payment date. In the case of the failure of the
Company to deliver such certificate, the sinking fund payment due on the next
succeeding sinking fund payment date for that series shall be paid entirely in
cash and shall be sufficient to redeem the principal amount of such Securities
subject to a mandatory sinking fund payment without the option to deliver or
credit Securities as provided in Section 1202 and without the right to make any
optional sinking fund payment, if any, with respect to such series.

   Not more than 60 days before each such sinking fund payment date the Trustee
shall select the Securities to be redeemed upon such sinking fund payment date
in the manner specified in Section 1103 and cause notice of the redemption
thereof to be given in the name of and at the expense of the Company in the
manner provided in Section 1104. Such notice having been duly given, the
redemption of such Securities shall be made upon the terms and in the manner
stated in Sections 1106 and 1107.

   Prior to any sinking fund payment date, the Company shall pay to the Trustee
or a Paying Agent (or, if the Company is acting as its own Paying Agent,
segregate and hold in trust as provided in Section 1003) in cash a sum equal to
any interest that will accrue to the date fixed for redemption of Securities or
portions thereof to be redeemed on such sinking fund payment date pursuant to
this Section 1203.

   Notwithstanding the foregoing, with respect to a sinking fund for any series
of Securities, if at any time the amount of cash to be paid into such sinking
fund on the next succeeding sinking fund payment date, together with any unused
balance of any preceding sinking fund payment or payments for such series, does
not exceed in the aggregate $100,000, the Trustee, unless requested by the
Company, shall not give the next succeeding notice of the redemption of
Securities of such series through the operation of the sinking fund. Any such
unused balance of moneys deposited in such sinking fund shall be added to the
sinking fund payment for such series to be made in cash on the next succeeding
sinking fund payment date or, at the request of the Company, shall be applied at
any time or from time to time to the purchase of Securities of such series, by
public or private purchase, in the open market or otherwise, at a purchase price
for such Securities (excluding accrued interest and brokerage commissions, for
which the Trustee or any paying agent will be provided funds by the Company) not
in excess of the principal amount thereof.

                               ARTICLE THIRTEEN

                        REPAYMENT AT OPTION OF HOLDERS

SECTION 1301.  APPLICABILITY OF ARTICLE.

   Repayment of Securities of any series before their Stated Maturity at the
option of Holders thereof shall be made in accordance with the terms of such
Securities and (except as otherwise specified as contemplated by Section 301 for
Securities of any series) in accordance with this Article.
<PAGE>

SECTION 1302.  REPAYMENT OF SECURITIES.

   Securities of any series subject to repayment in whole or in part at the
option of the Holders thereof will, unless otherwise provided in the terms of
such Securities, be repaid at a price equal to the principal amount thereof,
together with interest, if any, thereon accrued to the repayment date specified
in or pursuant to the terms of such Securities (the "Repayment Date"). The
Company covenants that not later than one Business Day before the Repayment Date
it will deposit with the Trustee or with a Paying Agent (or, if the Company is
acting as its own Paying Agent, segregate and hold in trust as provided in
Section 1003) an amount of money in the Currency in which the Securities of such
series are payable (except as otherwise specified pursuant to Section 301 for
the Securities of such series) sufficient to pay the principal (or if so
provided by the terms of the Securities of any series, a percentage of the
principal) of, and (except if the Repayment Date shall be an Interest Payment
Date) accrued interest on, all the Securities or portions thereof, as the case
may be, to be repaid on such date.

SECTION 1303.  EXERCISE OF OPTION.

   Securities of any series subject to repayment at the option of the Holders
thereof will contain an "Option to Elect Repayment" form on the reverse of such
Securities. In order to exercise such option if so specified in the terms of any
Security, the Holder shall deliver, or cause to be delivered, such Security at
the place of payment therefor specified in the terms of such Security (or at
such other place or places which the Company shall from time to time notify the
Holders of such Securities) with the "Option to Elect Repayment" form duly
completed by the Holder (or by the Holder's attorney duly authorized in
writing), not earlier than 45 days nor later than 30 days prior to the Repayment
Date applicable to such Security. If less than the entire principal amount of
such Security is to be repaid in accordance with the terms of such Security, the
principal amount of such Security to be repaid, in increments of the minimum
denomination for Securities of such series, and the denomination or
denominations of the Security or Securities to be issued to the Holder for the
portion of the principal amount of such Security surrendered that is not to be
repaid, must be specified. The principal amount of any Security providing for
repayment at the option of the Holder thereof, may not be repaid in part if,
following such repayment, the unpaid principal amount of such Security would be
less than the minimum authorized denomination of Securities of the series of
which such Security to be repaid is a part. Except as otherwise may be provided
by the terms of any Security, exercise of the repayment option by the Holder
shall be irrevocable unless waived by the Company.

SECTION 1304.  WHEN SECURITIES PRESENTED FOR REPAYMENT BECOME DUE AND PAYABLE.

   If Securities of any series providing for repayment at the option of the
Holders thereof shall have been surrendered as provided in this Article and as
provided by or pursuant to the terms of such Securities, such Securities or the
portions thereof, as the case may be, to be repaid shall become due and payable
and shall be paid by the Company on the Repayment Date therein specified, and on
and after such Repayment Date (unless the Company shall default in the payment
of such Securities on such Repayment Date) such Securities shall, if the same
were interest-bearing,
<PAGE>

cease to bear interest. Upon surrender of any such Security for repayment in
accordance with such provisions, the principal amount of such Security so to be
repaid shall be paid by the Company, together with accrued interest, if any, to
the Repayment Date; provided, however, that, installments of interest, if any,
whose Stated Maturity is on or prior to the Repayment Date shall be payable (but
without interest thereon, unless the Company shall default in the payment
thereof) to the Holders of such Securities, or one or more Predecessor
Securities, registered as such at the close of business on the relevant Record
Dates according to their terms and the provisions of Section 307.

   If the principal amount of any Security surrendered for repayment shall not
be so repaid upon surrender thereof, such principal amount (together with
interest, if any, thereon accrued to such Repayment Date) shall, until paid,
bear interest from the Repayment Date at the rate of interest set forth in such
Security.

SECTION 1305.  SECURITIES REPAID IN PART.

   Upon surrender of any Security which is to be repaid in part only, the
Company shall execute and the Trustee shall authenticate and deliver to the
Holder of such Security, without service charge and at the expense of the
Company, a new Security or Securities of the same series, of any authorized
denomination specified by the Holder, in an aggregate principal amount equal to
and in exchange for the portion of the principal of such Security so surrendered
which is not to be repaid.

                               ARTICLE FOURTEEN

                      DEFEASANCE AND COVENANT DEFEASANCE

SECTION 1401.  APPLICABILITY OF ARTICLE; COMPANY'S OPTION TO EFFECT
               DEFEASANCE OR COVENANT DEFEASANCE.

   If pursuant to Section 301 provision is made for either or both of (a)
defeasance of the Securities of a series under Section 1402 or (b) covenant
defeasance of the Securities of a series under Section 1403, then the provisions
of such Section or Sections, as the case may be, together with the other
provisions of this Article Fourteen, shall be applicable to the Securities of
such series, and the Company may at its option by Board Resolution, at any time,
with respect to the Securities of such series, elect to have either Section 1402
(if applicable) or Section 1403 (if applicable) be applied to the Outstanding
Securities of such series upon compliance with the conditions set forth below in
this Article Fourteen.

SECTION 1402.  DEFEASANCE AND DISCHARGE.

  Upon the Company's exercise of the above option applicable to this Section
with respect to any Securities of a series, the Company shall be deemed to have
been discharged from its obligations with respect to the Outstanding Securities
of such series on and after the date the conditions precedent set forth below
are satisfied but subject to satisfaction of the conditions subsequent set forth
below (hereinafter, "defeasance"). For this purpose, such defeasance means that
the Company shall be deemed to have paid and discharged the entire indebtedness
represented by the Outstanding Securities of such series and to have satisfied
all its other obligations under such Securities and this Indenture insofar as
such Securities are concerned (and the Trustee, at the expense of the Company
and upon Company
<PAGE>

Request, 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 Securities of such series to
receive, solely from the trust fund described in Section 1404 and as more fully
set forth in such Section, payments of the principal of (and premium, if any)
and interest on such Securities when such payments are due, (B) the Company's
obligations with respect to such Securities under Sections 304, 305, 306, 1002
and 1003 and such obligations as shall be ancillary thereto, (C) the rights,
powers, trusts, duties, immunities and other provisions in respect of the
Trustee hereunder and (D) this Article Fourteen. Subject to compliance with this
Article Fourteen, the Company may exercise its option under this Section 1402
notwithstanding the prior exercise of its option under Section 1403 with respect
to the Securities of such series.

SECTION 1403.  COVENANT DEFEASANCE.

   Upon the Company's exercise of the option provided in Section 1401 applicable
to this Section, the Company shall be released from its obligations under
Sections 1005, 1006, 1007 and 1008 with respect to the Outstanding Securities of
such series on and after the date the conditions precedent set forth below are
satisfied (hereinafter, "covenant defeasance"). For this purpose, such covenant
defeasance means that, with respect to the Outstanding Securities of such
series, the Company may omit to comply with and shall have no liability in
respect of any term, condition or limitation set forth in any such Section,
whether directly or indirectly by reason of any reference elsewhere herein to
any such Section or by reason of any reference in any such Section to any other
provision herein or in any other document, but the remainder of this Indenture
and such Securities shall be unaffected thereby.

SECTION 1404.  CONDITIONS TO DEFEASANCE OR COVENANT DEFEASANCE.

   The following shall be the conditions precedent or, as specifically noted
below, subsequent to application of either Section 1402 or Section 1403 to the
Outstanding Securities of such series:

    (1) The Company shall irrevocably have deposited or caused to be deposited
  with the Trustee as trust funds in trust for the purpose of making the
  following payments, specifically pledged as security for, and dedicated solely
  to, the benefit of the Holders of such Securities, (A) money in an amount, or
  (B) U.S. Government Obligations which through the scheduled payment of
  principal and interest in respect thereof in accordance with their terms will
  provide, not later than one Business Day before the due date of any payment,
  money in an amount, or (C) a combination thereof, sufficient, in each case,
  without reinvestment, in the opinion of a nationally recognized firm of
  independent public accountants expressed in a written certification thereof
  delivered to the Trustee, to pay and discharge, and which shall be applied by
  the Trustee to pay and discharge, (i) the principal of (and premium, if any)
  and interest on the Outstanding Securities of such series to maturity or
  redemption, as the case may be, and (ii) any mandatory sinking fund payments
  or analogous payments applicable to the Outstanding Securities of such series
  on the due dates thereof. Before such a deposit the Company may make
  arrangements satisfactory to the Trustee for the redemption of Securities at a
  future date or dates in accordance with Article Eleven, which shall be given
  effect in applying the foregoing.
<PAGE>

    (2) No Event of Default or event which with notice or lapse of time or both
  would become an Event of Default with respect to the Securities of such series
  shall have occurred and be continuing (A) on the date of such deposit or (B)
  insofar as subsections 501(5) and (6) are concerned, at any time during the
  period ending on the 123rd day after the date of such deposit or, if longer,
  ending on the day following the expiration of the longest preference period
  applicable to the Company in respect of such deposit (it being understood that
  the condition in this clause (B) is a condition subsequent and shall not be
  deemed satisfied until the expiration of such period).

    (3) Such defeasance or covenant defeasance shall not (A) cause the Trustee
  for the Securities of such series to have a conflicting interest for purposes
  of the Trust Indenture Act with respect to any securities of the Company or
  (B) result in the trust arising from such deposit constituting, unless it is
  qualified as, a regulated investment company under the Investment Company Act
  of 1940, as amended.

    (4) Such defeasance or covenant defeasance shall not result in a breach or
  violation of, or constitute a default under, this Indenture or any other
  agreement or instrument to which the Company is a party or by which it is
  bound.

    (5) The Company has delivered to the Trustee an Opinion of Counsel, to the
  effect that, based on federal income tax laws then in effect, the Holders of
  the Securities will not recognize income, gain or loss on the Securities or
  the Securities of such series, as the case may be, for federal income tax
  purposes as a result of such defeasance or covenant defeasance and shall be
  subject to federal income tax in the same amounts and at the same times as
  would have been the case if such option had not been exercised.

    (6) The Company has delivered to the Trustee an Officers' Certificate and an
  Opinion of Counsel, each stating that all conditions precedent herein provided
  for relating to either the defeasance under Section 1402 or the covenant
  defeasance under Section 1403, as the case may be, have been complied with and
  an Opinion of Counsel to the effect that either (i) as a result of a deposit
  pursuant to paragraph (1) above and the related exercise of the Company's
  option under Section 1402 or Section 1403 (as the case may be), registration
  is not required under the Investment Company Act of 1940, as amended, by the
  Company, with respect to the trust funds representing such deposit, or by the
  trustee for such trust funds or (ii) all necessary registrations under said
  Act have been effected.

    (7) Such defeasance or covenant defeasance shall be effected in compliance
  with any additional terms, conditions or limitations which may be imposed on
  the Company in connection therewith pursuant to Section 301.

    Notwithstanding the satisfaction and discharge of this Indenture, the
  obligations of the Company to the Trustee under Section 606 and, if money or
  U.S. Government Obligations shall have been deposited with the Trustee
  pursuant to this Section, the obligations of the Trustee under Section 1405
  and the last paragraph of Section 1003 shall survive.

SECTION 1405.  APPLICATION OF TRUST MONEY.
<PAGE>

   Subject to the provisions of the last paragraph of Section 1003, all money
and U.S. Government Obligations deposited with the Trustee pursuant to Section
1401 shall be held in trust and applied by it, in accordance with the provisions
of the Securities and this Indenture, to the payment, either directly or through
any Paying Agent (including the Company acting as its own Paying Agent) as the
Trustee may determine, to the Persons entitled thereto, of the principal (and
premium, if any) and interest for whose payment such money has been deposited
with the Trustee.

   Anything in this Article Fourteen to the contrary notwithstanding, if and to
the extent the deposited money or U.S. Government Obligations (or the proceeds
thereof) either (i) cannot be applied by the Trustee in accordance with this
Section because of a court order or (ii) are for any reason insufficient in
amount, then the Company's obligations to pay principal of (and premium, if any)
and interest on the Securities of such series shall be reinstated to the extent
necessary to cover the deficiency on any due date for payment. In any case
specified in clause (i), the Company's interest in the deposited money and U.S.
Government Obligations (and proceeds thereof) shall be reinstated to the extent
the Company's payment obligations are reinstated.

   This instrument may be executed in any number of counterparts, each of which
so executed shall be deemed to be an original, but all such counterparts shall
together constitute but one and the same instrument.

   IN WITNESS WHEREOF, the parties hereto have caused this Indenture to be duly
executed, and their respective corporate seals to be hereunto affixed and
attested, all as of the day and year first above written.

                                  AMBAC FINANCIAL GROUP, INC.

                                  By _____________________________
                                     Name:
                                     Title:

Attest:

______________________________
Name:
Title:

                                  FIRST UNION NATIONAL BANK

                                  By ________________________________
                                     Name:
                                     Title:

Attest:

_______________________________
Name:
Title:
<PAGE>

STATE OF NEW YORK   )
                    )  ss.:
COUNTY OF NEW YORK  )

  On this _________ day of March, 2001, before me personally came
_______________________, to me personally known, who, being by me duly
sworn, did depose and say that he is ________________ of Ambac Financial
Group, Inc., the corporation described in and which executed the above
instrument; that he knows the corporate seal of said corporation; that the
seal affixed to said instrument is such corporate seal; that it was so
affixed by authority of the Board of Directors of said corporation; and
that he signed his name thereto by like authority.

[NOTARIAL SEAL]

                                         __________________________
                                                Notary Public

STATE OF NEW YORK   )
                    )  ss.:
COUNTY OF NEW YORK  )

  On this ____________ day of March, 2001, before me personally came
_______________, to me personally known, who being by me duly sworn did
depose and say that s/he is a ___________ of First Union National Bank the
national banking association described in and which executed the above
instrument; that s/he knows the corporate seal of said national banking
association; that the seal affixed to said instrument is such corporate
seal; that it was so affixed by authority of the Board of Directors of said
national banking association; and that s/he signed his name thereto by like
authority.

[NOTARIAL SEAL]

                                         ____________________________
                                                Notary Public

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