Document:

Exhibit 4.A - Third Supplemental Indenture

    EXHIBIT
      4.A

     

    Execution
      Copy

     

    

     

    COLORADO
      INTERSTATE GAS COMPANY

     

    

     

    as
      Issuer

     

    

     

    and

     

    

     

    THE
      BANK OF
      NEW YORK TRUST COMPANY, N.A.

     

    

     

    as
      Trustee

     

    

     

    THIRD
      SUPPLEMENTAL INDENTURE

     

    

     

    Dated
      as of
      November 1, 2005

     

    

     

    To

     

    INDENTURE

     

    Dated
      as of
      June 27, 1997

     

    

     

    6.80%
      SENIOR NOTES
      DUE
      2015

     

    

     

    

     

    

     

    

     

    
      
        
           

           

        

        
        

      

      
        
        

        
          

        

      

      
        
        

        
        

      

    

    TABLE
      OF
      CONTENTS

     

     

    Page

    

    
      	
              ARTICLE
                1
                Relation to Indenture; Definitions

            	
              1

            
	 	
              SECTION
                1.01.

            	
              Relation
                to
                Indenture 

            	
              1

            
	 	
              SECTION
                1.02.

            	
              Definitions

            	
              1

            
	 	
              SECTION
                1.03.

            	
              General
                References

            	
              1

            
	 	 	 	 
	
              ARTICLE
                2
                The Series
                of Securities

            	
              2

            
	 	
              SECTION
                2.01.

            	
              The
                Form and
                Title of the Securities

            	
              2

            
	 	
              SECTION
                2.02.

            	
              Amount

            	
              2

            
	 	
              SECTION
                2.03.

            	
              Stated
                Maturity

            	
              2

            
	 	
              SECTION
                2.04.

            	
              Interest
                and
                Interest Rates

            	
              2

            
	 	
              SECTION
                2.05.

            	
              Place
                of
                Payment

            	
              2

            
	 	
              SECTION
                2.06.

            	
              Optional
                Redemption

            	
              2

            
	 	
              SECTION
                2.07.

            	
              Discharge

            	
              3

            
	 	
              SECTION
                2.08.

            	
              Global
                Securities; Restrictions on Transfer and Exchange

            	
              3

            
	 	
              SECTION
                2.09.

            	
              Transfer
                and
                Exchange

            	
              3

            
	 	
              SECTION
                2.10.

            	
              Legends

            	
              4

            
	 	
              SECTION
                2.11.

            	
              Registration
                Rights Agreement

            	
              5

            
	 	 
	
              ARTICLE
                3
                Covenants;
                Amendments to Indenture

            	
              5

            
	 	
              SECTION
                3.01.

            	
              Additional
                Covenant

            	
              5

            
	 	
              SECTION
                3.02.

            	
              Amendments
                to
                Indenture

            	
              6

            
	 	 	 	 
	
              ARTICLE
                4
                Miscellaneous

            	
              7

            
	 	
              SECTION
                4.01.

            	
              Certain
                Trustee Matters

            	
              7

            
	 	
              SECTION
                4.02.

            	
              Continued
                Effect

            	
              8

            
	 	
              SECTION
                4.03.

            	
              Governing
                Law

            	
              8

            
	 	
              SECTION
                4.04.

            	
              Counterparts

            	
              8

            

    

    

     

    EXHIBITS

     

    Exhibit
      A: Form
      of
      Note

     

    

     

    

     

    

     

    
      
        
          Third
            Supplemental Indenture

           

        

        
        

      

      
        
        

        
          

        

      

      
        
        

        
        

      

    

    THIRD
      SUPPLEMENTAL INDENTURE,
      dated as of
      November 1, 2005 (this “Third
      Supplemental Indenture”),
      between
COLORADO
      INTERSTATE GAS COMPANY,
      a Delaware
      corporation (the “Company”),
      and
THE
      BANK OF
      NEW YORK TRUST COMPANY, N.A.,
      a national
      banking association (successor-in-interest to Harris Trust and Savings Bank),
      as
      trustee under the Indenture referred to below (in such capacity, the
“Trustee”).

     

    RECITALS
      OF
      THE COMPANY

     

    WHEREAS,
      the
      Company and the Trustee are parties to an Indenture, dated as of June 27, 1997
      (the “Original
      Indenture”),
      as amended and
      supplemented by the First Supplemental Indenture thereto dated as of June 27,
      1997 (the “First
      Supplemental Indenture”),
      and the Second
      Supplemental Indenture thereto dated as of March 9, 2005 (the “Second
      Supplemental Indenture”)
      (the Original
      Indenture, as supplemented from time to time, including without limitation
      pursuant to the First Supplemental Indenture and the Second Supplemental
      Indenture and pursuant to this Third Supplemental Indenture being referred
      to
      herein as the “Indenture”);
      and

     

    WHEREAS,
      under the
      Original Indenture, a new series of Securities may at any time be established
      by
      the Board of Directors of the Company, in accordance with the provisions of
      the
      Original Indenture, and the terms of such series may be established by a
      supplemental indenture executed by the Company and by the Trustee;
      and

     

    WHEREAS,
      the
      Company proposes to create under the Indenture a new series of Securities;
      and

     

    WHEREAS,
      all acts
      and things necessary to make the Notes (as herein defined), when executed by
      the
      Company and authenticated and delivered by the Trustee as provided in the
      Original Indenture and this Third Supplemental Indenture, the valid and binding
      obligations of the Company and to make this Third Supplemental Indenture a
      valid
      and binding agreement in accordance with the Original Indenture have been done
      or performed; and

     

    WHEREAS,
      the
      Company has entered into a Registration Rights Agreement dated as of November
      1,
      2005 (the “Registration
      Rights Agreement”)
      relating to the
      Notes, among the Company and the initial purchasers named therein (the
“Initial
      Purchasers”);

     

    NOW,
      THEREFORE, in
      consideration of the premises, agreements and obligations set forth herein
      and
      for other good and valuable consideration, the receipt and sufficiency of which
      are hereby acknowledged, the parties hereto hereby agree, for the equal and
      proportionate benefit of all Holders of the Notes, as follows:

     

    ARTICLE
      1

    Relation
      to
      Indenture; Definitions

     

    SECTION
      1.01.   Relation
      to Indenture. 

     

    With
      respect to the
      Notes, this Third Supplemental Indenture constitutes an integral part of the
      Indenture.

     

    SECTION
      1.02.   Definitions. 

     

    For
      all purposes of
      this Third Supplemental Indenture, capitalized terms used herein and not
      otherwise defined herein shall have the meanings assigned thereto in the
      Original Indenture.

     

    SECTION
      1.03.   General
      References. 

     

    All
      references in
      this Third Supplemental Indenture to Articles and Sections, unless otherwise
      specified, refer to the corresponding Articles and Sections of this Third
      Supplemental Indenture; and the terms “herein”,
“hereof”,
“hereunder”
      and any other
      word of similar import refers to this Third Supplemental Indenture.

     

    ARTICLE
      2

    The
      Series
      of Securities

     

    SECTION
      2.01.   The
      Form and Title of the Securities. 

     

    There
      is hereby
      established a new series of Securities to be issued under the Indenture and
      to
      be designated as the Company’s 6.80% Senior Notes due 2015 (the “Notes”).
      The Notes shall
      be substantially in the form attached as Exhibit A
      hereto, in each
      case with such appropriate insertions, omissions, substitutions and other
      variations as are required or permitted by the Indenture, and may have such
      letters, numbers or other marks of identification and such legends or
      endorsements placed thereon as the Company may deem appropriate or as may be
      required or appropriate to comply with any laws or with any rules made pursuant
      thereto or with the rules of any securities exchange or automated quotation
      system on which the Notes may be listed or traded, or to conform to general
      usage, or as may, consistently with the Indenture, be determined by the officers
      executing such Notes, as evidenced by their execution thereof.

     

    The
      Notes shall be
      executed, authenticated and delivered in accordance with the provisions of,
      and
      shall in all respects be subject to, the terms, conditions and covenants of
      the
      Original Indenture as supplemented by this Third Supplemental Indenture
      (including the form of Note set forth as Exhibit A
      hereto (the terms
      of which are incorporated in and made a part of this Third Supplemental
      Indenture for all intents and purposes)).

     

    SECTION
      2.02.   Amount. 

     

    The
      aggregate
      principal amount of the Notes which may be authenticated and delivered pursuant
      hereto is unlimited. The Trustee shall initially authenticate and deliver Notes
      for original issue in an initial aggregate principal amount of up to
      $400,000,000 upon delivery to the Trustee of a Company Order for the
      authentication and delivery of such Notes. The Company may, from time to time,
      without notice to or the consent of the Holders of the Notes, increase the
      principal amount of the Notes under the Indenture and issue such increased
      principal amount (or any portion thereof), in which case any additional Notes
      so
      issued will have the same form and terms (other than the date of issuance and,
      under certain circumstances, the date from which interest thereon will begin
      to
      accrue), and will carry the same right to receive accrued and unpaid interest,
      as the Notes previously issued, and such additional Notes will form a single
      series with the Notes previously issued.

     

    SECTION
      2.03.   Stated
      Maturity.

     

    The
      Notes may be
      issued on any Business Day on or after November 1, 2005, and the Stated Maturity
      of the Notes shall be November 15, 2015.

     

    SECTION
      2.04.   Interest
      and Interest Rates. 

     

    The
      rate or rates
      at which the Notes shall bear interest, the date or dates from which such
      interest shall accrue, the Interest Payment Dates on which any such interest
      shall be payable and the Regular Record Date for any interest payable on any
      Interest Payment Date, in each case, shall be as set forth in the form of Note
      set forth as Exhibit A
      hereto.

     

    SECTION
      2.05.   Place
      of Payment. 

     

    As
      long as any
      Notes are outstanding, the Company shall maintain an office or agency in the
      Borough of Manhattan, The City of New York, where Notes may be presented for
      payment.

     

    SECTION
      2.06.   Optional
      Redemption.

     

    At
      its option, the
      Company may redeem the Notes, in whole or in part, in principal amounts of
      $1,000 or any integral multiple thereof, at any time or from time to time,
      at
      the applicable redemption price determined as set forth in the form of Note
      attached hereto as Exhibit
      A,
      in accordance with the terms set forth in the Notes and in accordance with
      Article 3A of the Original Indenture.

     

    SECTION
      2.07.   Discharge.

     

    Article
      8 of the
      Original Indenture shall apply to the Notes.

     

    SECTION
      2.08.   Global
      Securities; Restrictions on Transfer and Exchange. 

     

    The
      Notes shall
      initially be issued in the form of one or more Global Securities. Such Global
      Securities (i)  shall bear the legends applicable to Global Securities
      set
      forth in the Original Indenture (including without limitation in Section 2.03
      thereof), (ii) may be exchanged in whole or in part for Securities in
      definitive form upon the terms and subject to the conditions provided in
      Section 2.07 of the Original Indenture and in this Third Supplemental
      Indenture and (iii) shall otherwise be subject to the applicable provisions
      of the Indenture.

     

    (1)  Rule
      144A
      Global Notes.
      The Notes offered
      and sold to “qualified institutional buyers” (“QIBs”
      or individually,
      a “QIB”)
      (which term
      shall have the meaning assigned to it in Rule 144A under the Securities Act
      of
      1933, as amended (the “Securities
      Act”))
      in the United
      States of America in reliance on Rule 144A will initially be issued as permanent
      Global Securities (the “Rule
      144A Global Notes”),
      without
      interest coupons, substantially in the form of Exhibit
      A
      hereto. The Rule 144A Global Notes will be duly executed by the Company,
      authenticated by the Trustee, deposited with the Trustee (as custodian for
      The
      Depository Trust Company (“DTC”),
      which shall act
      as Depository with respect to the Notes constituting Global Securities) and
      registered in the name of DTC or a nominee thereof.

     

    (2)  Regulation
      S
      Global Notes.
      Notes offered and
      sold in Offshore Transactions to Non-U.S. Persons (each such term to have the
      meaning assigned to it in Regulation S under the Securities Act (“Regulation
      S”))
      in reliance on
      Regulation S will initially be issued as permanent Global Securities (the
“Regulation
      S Global Notes”),
      without
      interest coupons, substantially in the form of Exhibit
      A
      hereto. The Regulation S Global Notes will be duly executed by the Company,
      authenticated by the Trustee, deposited with the Trustee (as custodian for
      DTC)
      and registered in the name of DTC or a nominee thereof.

     

    SECTION
      2.09.   Transfer
      and Exchange. 

     

    (1)  Transfer
      and
      Exchange of Notes in Certificated Form.
      In addition to
      the requirements set forth in Section 2.07 of the Original Indenture, the Notes
      in certificated form that are Registrable Securities under the Registration
      Rights Agreement (the “Transfer
      Restricted Securities”)
      presented or
      surrendered for registration of transfer or exchange pursuant to Section 2.07
      of
      the Original Indenture shall be accompanied by the following additional
      information and documents, as applicable, upon which the Registrar may
      conclusively rely:

     

    (a)  if
      such Transfer
      Restricted Securities are being delivered to the Registrar by a Holder for
      registration in the name of such Holder, without transfer, a certification
      from
      such Holder to that effect (in substantially the form of the Exchange/Transfer
      Certificate included in Exhibit
      A
      hereto); or

     

    (b)  if
      such Transfer
      Restricted Securities are being transferred (1) to a QIB in accordance with
      Rule
      144A under the Securities Act or (2) pursuant to an exemption from registration
      in accordance with Rule 144 under the Securities Act (and based upon an opinion
      of counsel if the Company or the Trustee so requests) or (3) pursuant to an
      effective registration statement under the Securities Act, a certification
      to
      that effect from such holder (in substantially the form of the Exchange/Transfer
      Certificate included in Exhibit
      A
      hereto); or

     

    (c)  if
      such Transfer
      Restricted Securities are being transferred pursuant to an exemption from
      registration in accordance with Rule 904 of Regulation S under the Securities
      Act, certifications to that effect from such Holder (in substantially the form
      of both (i) the Exchange/Transfer Certificate included in Exhibit
      A
      hereto and (ii) the Regulation S Certificate included in Exhibit
      A
      hereto) and an opinion of counsel to that effect if the Company or the Trustee
      so requests; or

     

    (d)  if
      such Transfer
      Restricted Securities are being transferred in reliance on and in compliance
      with another exemption from the registration requirements of the Securities
      Act,
      a certification to that effect from such Holder (in substantially the form
      of
      the Exchange/Transfer Certificate included in Exhibit
      A
      hereto) and an opinion of counsel to that effect if the Company or the Trustee
      so requests.

     

    (2)  Transfer
      and
      Exchange of Global Notes.
      The transfer and
      exchange of the Global Notes (as defined below) or beneficial interests therein
      shall be effected through the Depository, upon the terms and subject to the
      conditions provided in Section 2.07 of the Original Indenture and Article 2
      of
      this Third Supplemental Indenture (including the restrictions on transfer set
      forth therein and herein) and the rules and procedures of the Depository
      therefor, which shall include restrictions on transfer comparable to those
      set
      forth therein and herein to the extent required by the Securities
      Act.

     

    SECTION
      2.10.   Legends. 

     

    (1)  Except
      as permitted
      by the following paragraphs (2) and (3) immediately below, each certificate
      evidencing the Rule 144A Global Notes or Regulation S Global Notes (each a
      “Global
      Note”)
      or any other
      Notes in certificated form (and all Notes issued in exchange therefor or
      substitution thereof other than the Exchange Notes (as defined below)) shall
      bear a legend in substantially the following form:

     

    THIS
      NOTE HAS NOT
      BEEN REGISTERED UNDER THE U.S. SECURITIES ACT OF 1933, AS AMENDED (THE
“SECURITIES ACT”) AND, ACCORDINGLY, MAY NOT BE OFFERED, SOLD, PLEDGED OR
      OTHERWISE TRANSFERRED WITHIN THE UNITED STATES OR TO, OR FOR THE ACCOUNT OR
      BENEFIT OF, U.S. PERSONS, EXCEPT AS SET FORTH IN THE FOLLOWING SENTENCE. BY
      ITS
      ACQUISITION HEREOF OR OF A BENEFICIAL INTEREST HEREIN, THE HOLDER (1) REPRESENTS
      THAT (A) IT IS A “QUALIFIED INSTITUTIONAL BUYER” (AS DEFINED IN RULE 144A UNDER
      THE SECURITIES ACT) (A “QIB”), (B) IT IS NOT A U.S. PERSON, IS NOT ACQUIRING
      THIS NOTE FOR THE ACCOUNT OR BENEFIT OF A U.S. PERSON AND IS ACQUIRING THIS
      NOTE
      IN AN OFFSHORE TRANSACTION IN COMPLIANCE WITH REGULATION S UNDER THE SECURITIES
      ACT OR (C) IT IS AN INSTITUTIONAL “ACCREDITED INVESTOR” (AS DEFINED IN RULE
      501(A)(1), (2), (3) OR (7) OF REGULATION D UNDER THE SECURITIES ACT) (AN “IAI”),
      (2) AGREES THAT IT WILL NOT, WITHIN THE TIME PERIOD REFERRED TO UNDER RULE
      144(k) (TAKING INTO ACCOUNT THE PROVISIONS OF RULE 144(d) UNDER THE SECURITIES
      ACT, IF APPLICABLE) UNDER THE SECURITIES ACT AS IN EFFECT ON THE DATE OF THE
      TRANSFER OF THIS NOTE, RESELL OR OTHERWISE TRANSFER THIS NOTE EXCEPT (A) TO
      THE
      ISSUER OR ANY SUBSIDIARY THEREOF, (B) TO A PERSON WHOM THE HOLDER REASONABLY
      BELIEVES IS A QIB PURCHASING FOR ITS OWN ACCOUNT OR FOR THE ACCOUNT OF A QIB
      IN
      COMPLIANCE WITH RULE 144A UNDER THE SECURITIES ACT, (C) OUTSIDE THE UNITED
      STATES IN AN OFFSHORE TRANSACTION IN COMPLIANCE WITH RULE 904 UNDER THE
      SECURITIES ACT, (D) PURSUANT TO THE EXEMPTION FROM REGISTRATION PROVIDED BY
      RULE
      144 UNDER THE SECURITIES ACT (IF AVAILABLE), (E) TO AN IAI THAT, PRIOR TO SUCH
      TRANSFER, FURNISHES TO THE TRUSTEE A SIGNED LETTER CONTAINING CERTAIN
      REPRESENTATIONS AND AGREEMENTS RELATING TO THE REGISTRATION OF TRANSFER OF
      THIS
      NOTE (THE FORM OF WHICH LETTER CAN BE OBTAINED FROM THE TRUSTEE) AND, IF SUCH
      TRANSFER IS IN RESPECT OF AN AGGREGATE PRINCIPAL AMOUNT OF NOTES AT THE TIME
      OF
      TRANSFER OF LESS THAN $250,000, AN OPINION OF COUNSEL ACCEPTABLE TO THE ISSUER
      THAT SUCH TRANSFER IS IN COMPLIANCE WITH THE SECURITIES ACT OR (F) PURSUANT
      TO
      AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT AND, IN EACH CASE,
      IN ACCORDANCE WITH APPLICABLE STATE SECURITIES LAWS, AND (3) AGREES THAT IT
      WILL
      DELIVER TO EACH PERSON TO WHOM THIS NOTE OR AN INTEREST HEREIN IS TRANSFERRED
      A
      NOTICE SUBSTANTIALLY TO THE EFFECT OF THIS LEGEND. IN CONNECTION WITH ANY
      TRANSFER OF THIS NOTE OR ANY INTEREST HEREIN WITHIN THE TIME PERIOD REFERRED
      TO
      ABOVE, THE HOLDER MUST CHECK THE APPROPRIATE BOX SET FORTH ON THE REVERSE HEREOF
      RELATING TO THE MANNER OF SUCH TRANSFER AND SUBMIT THIS CERTIFICATE TO THE
      TRUSTEE. AS USED HEREIN, THE TERMS “OFFSHORE TRANSACTION,”“UNITED STATES” AND
“U.S. PERSON” HAVE THE MEANINGS GIVEN TO THEM BY RULE 902 OF REGULATION S UNDER
      THE SECURITIES ACT. THE INDENTURE CONTAINS A PROVISION REQUIRING THE TRUSTEE
      TO
      REFUSE TO REGISTER ANY TRANSFER OF THIS NOTE IN VIOLATION OF THE FOREGOING
      RESTRICTIONS.

     

    (2)  Upon
      any sale or
      transfer of a Transfer Restricted Security (including any Transfer Restricted
      Security represented by a Global Note) pursuant to Rule 144 under the Securities
      Act or an effective registration statement under the Securities Act, which
      effectiveness shall be certified by the Company to the Trustee and Registrar
      upon which each may conclusively rely:

     

    (a)  in
      the case of any
      Transfer Restricted Security in definitive form, the Registrar shall permit
      the
      Holder thereof to exchange such Transfer Restricted Security for a Note in
      definitive form that does not bear the legend set forth in (1) above and rescind
      any restriction on the transfer of such Transfer Restricted Security;
      and

     

    (b)  in
      the case of any
      Transfer Restricted Security represented by a Global Note, such Transfer
      Restricted Security shall not be required to bear the legend(s) set forth in
      (1)
      above if all other interests in such Global Note have been or are concurrently
      being sold or transferred pursuant to Rule 144 under the Securities Act or
      pursuant to an effective registration statement under the Securities Act, but
      such Transfer Restricted Security shall continue to be subject to the provisions
      of Section 2.07 of the Original Indenture and this Section 2.10 of this Third
      Supplemental Indenture.

     

    (3)  Notwithstanding
      the
      foregoing, upon consummation of the Exchange Offer (as defined in the
      Registration Rights Agreement), the Company shall issue and, upon receipt of
      a
      Company Order in accordance with Section 2.03 of the Original Indenture, the
      Trustee shall authenticate Notes (“Exchange
      Notes”)
      in exchange for
      Notes accepted for exchange in the Exchange Offer, which Exchange Notes shall
      not bear the legend set forth in (1) above, and the Registrar shall rescind
      any
      restriction on the transfer of the Exchange Notes, in each case unless the
      Holder of Notes being transferred in the Exchange Offer is either (A) a
      broker-dealer tendering Notes acquired directly from the Company, (B) a person
      participating in the Exchange Offer for purposes of distributing the Exchange
      Notes or (C) a person who is an “affiliate” (as defined in Rule 144 under the
      Securities Act) of the Company. The Company shall identify to the Trustee such
      Holders of the Notes in a written certification signed by an Officer of the
      Company and, absent receipt of a certificate from the Company to such effect,
      the Trustee shall assume that there are no such Holders.

     

    SECTION
      2.11.   Registration
      Rights Agreement. 

     

    Holders
      of the
      Notes shall have the benefit of the Company’s registration obligations with
      respect to the Notes, and such Holders shall also have certain obligations
      to
      indemnify the Company under certain circumstances, all as more fully set forth
      in the Registration Rights Agreement.

     

    ARTICLE
      3

    Covenants;
      Amendments to Indenture

     

    SECTION
      3.01.   Additional
      Covenant

     

    The
      covenant
      contained in this Section 3.01 shall apply to the Notes only and not to any
      other series of Securities issued under the Indenture, and is being included
      solely for the benefit of the Notes and the Holders thereof. This covenant
      shall
      be effective only for so long as there remain outstanding any
      Notes.

     

    SEC
      Reports;
      Financial Statements.
      In addition to
      the requirements of Section 4.05 of the Original Indenture:

     

    (1) whether
      or not the
      Company is then subject to Section 13 or 15(d) of the Exchange Act, from and
      after the Original Issue Date of the Notes, the Company shall electronically
      file with the SEC, so long as the Notes are outstanding, the annual, quarterly
      and other periodic reports that the Company is required to file (or would
      otherwise be required to file) with the SEC pursuant to Sections 13 and 15(d)
      of
      the Exchange Act, and such documents shall be filed with the SEC on or prior
      to
      the respective dates (the “Required
      Filing Dates”)
      by which the
      Company is required to file (or would otherwise be required to file) such
      documents, unless, in each case, such filings are not then permitted by the
      SEC;

     

    (2) from
      and after the
      Original Issue Date of the Notes, the Company shall provide the Trustee with,
      and the Trustee will mail to any Holder of Notes requesting in writing to the
      Trustee copies of, such annual, quarterly and other periodic reports specified
      in Sections 13 and 15(d) of the Exchange Act within 15 days after its Required
      Filing Date;

     

    (3) in
      addition, for so
      long as the Notes are not freely transferable under the Securities Act, the
      Company shall furnish to the Holders of Notes and to prospective investors
      in
      the Notes, the information required to be delivered pursuant to Rule 144A(d)(4)
      under the Securities Act;

     

    (4) the
      Company shall
      provide the Trustee with a sufficient number of copies of all reports and other
      documents and information that the Trustee may be required to deliver to Holders
      of Notes under clause (2) of this Section 3.01; and

     

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

     

    SECTION
      3.02.   Amendments
      to Indenture

     

    The
      amendments
      contained in this Section 3.02 shall apply to the Notes only and not to any
      other series of Securities issued under the Indenture. Such amendments shall
      be
      effective only for so long as there remain outstanding any Notes.

     

    (a) Section
      1.01 of the
      Original Indenture is hereby amended, subject to the preamble of this Section
      3.02 and with respect to the Notes only, by inserting the following definition
      in the appropriate alphabetical position:

     

    “Permitted
      Liens”
      means

     

    (1) Liens
      upon
      rights-of-way for pipeline purposes;

     

    (2) any
      governmental
      Lien, mechanics’, materialmen’s, carriers’ or similar Lien incurred in the
      ordinary course of business which is not yet due or which is being contested
      in
      good faith by appropriate proceedings and any undetermined Lien which is
      incidental to construction;

     

    (3) the
      right reserved
      to, or vested in, any municipality or public authority by the terms of any
      right, power, franchise, grant, license, permit or by any provision of law,
      to
      purchase or recapture or to designate a purchase of, any property;

     

    (4) Liens
      of taxes and
      assessments which are (A) for the then current year, (B) not at the time
      delinquent or (C) delinquent but the validity of which is being contested at
      the
      time by the Company or any Subsidiary in good faith;

     

    (5) Liens
      of, or to
      secure performance of leases;

     

    (6) any
      Lien upon, or
      deposits of, any assets in favor of any surety company or clerk of court for
      the
      purposes of obtaining indemnity or stay of judicial proceedings;

     

    (7) any
      Lien upon
      property or assets acquired or sold by the Company or any Subsidiary resulting
      from the exercise of any rights arising out of defaults on
      receivables;

     

    (8) any
      Lien incurred
      in the ordinary course of business in connection with workmen’s compensation,
      unemployment insurance, temporary disability, social security, retiree health
      or
      similar laws or regulations or to secure obligations imposed by statute or
      governmental regulations;

     

    (9) any
      Lien upon any
      property or assets in accordance with customary banking practice to secure
      any
      Indebtedness incurred by the Company or any Subsidiary in connection with the
      exporting of goods to, or between, or the marketing of goods in, or the
      importing of goods from, foreign countries;

     

    (10) any
      Lien securing
      industrial development, pollution control, or similar revenue
      bonds;

     

    (11) Liens
      to secure
      Indebtedness owing to the Company or its Subsidiaries;

     

    (12) Liens
      contemplated
      by the Indenture relating to compensation and other payments to the Trustee;
      and

     

    (13) Liens
      deemed to
      exist by reason of negative pledges in respect of Indebtedness.

     

    (b) Section
      2.03 of the
      Original Indenture is hereby amended, subject to the preamble of this Section
      3.02 and with respect to the Notes only, by deleting the second sentence of
      the
      first paragraph of such Section 2.03.

     

    (c) Section
      4.08 of the
      Original Indenture is hereby amended, subject to the preamble of this Section
      3.02 and with respect to the Notes only, by:

     

    (i) deleting
      the word
“and” immediately following the semicolon appearing in clause (5) of such
      Section 4.08;

     

    (ii) inserting
      the
      following new clause (6) immediately below clause (5) of such Section
      4.08:

     

    (6) Permitted
      Liens;
      and

     

    ;
      and

     

    (iii) renumbering
      and
      restating the former clause (6) of such Section 4.08 to read in its entirety
      as
      follows:

     

    (7) any
      extension,
      renewal or replacement (or successive extensions, renewals or replacements),
      as
      a whole or in part, of any Lien referred to in the foregoing clauses (1) through
      (6) inclusive; provided that such extension, renewal or replacement of such
      Lien
      is limited to all or any part of the same property, shares of stock or
      Indebtedness that secured the Lien extended, renewed or replaced (plus
      improvements on such property), and that such secured Indebtedness at such
      time
      is not increased.

     

    ARTICLE
      4

    Miscellaneous

     

    SECTION
      4.01.   Certain
      Trustee Matters. 

     

    The
      recitals
      contained herein shall be taken as the statements of the Company, and the
      Trustee assumes no responsibility for their correctness.

     

    The
      Trustee makes
      no representations as to the validity or sufficiency of this Third Supplemental
      Indenture or the Notes or the proper authorization or the due execution hereof
      or thereof by the Company.

     

    SECTION
      4.02.   Continued
      Effect. 

     

    Except
      as expressly
      supplemented and amended by this Third Supplemental Indenture, the Original
      Indenture (as supplemented and amended by the First Supplemental Indenture)
      shall continue in full force and effect in accordance with the provisions
      thereof, and the Original Indenture (as supplemented and amended by the First
      Supplemental Indenture and by this Third Supplemental Indenture) is in all
      respects hereby ratified and confirmed. This Third Supplemental Indenture and
      all its provisions shall be deemed a part of the Original Indenture in the
      manner and to the extent herein and therein provided.

     

    SECTION
      4.03.   Governing
      Law. 

     

    This
      Third
      Supplemental Indenture and the Notes shall be governed by and construed in
      accordance with the laws of the State of New York without regard to principles
      of conflicts of law.

     

    SECTION
      4.04.   Counterparts. 

     

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

     

    (Signature
      Pages Follow)

     

    

     

    

     

    

     

    

     

     

    

     

    

     

    
      
        
          Third
            Supplemental Indenture

           

        

        
        

      

      
        
        

        
          

        

      

      
        
        

        
        

      

    

    IN
      WITNESS WHEREOF,
      the parties hereto have caused this Third Supplemental Indenture to be duly
      executed and delivered, all as of the day and year first above
      written.

     

    COLORADO
      INTERSTATE
      GAS COMPANY

    

    

    By:/s/
      Daniel
      B. Martin        

    Name:
      Daniel B.
      Martin

    Title:
      Senior Vice
      President

    

    

    ATTEST:

    

    By:/s/
      Stacy J.
      James             

    Name:
      Stacy J.
      James

    Title:
      Corporate
      Secretary

    

    

    

    
      
        
          HOU:2509545.3
            

           

          Third
            Supplemental Indenture

           

        

        
        

      

      
        
        

        
          

        

      

      
        
        

        
        

      

    

    THE
      BANK OF NEW
      YORK TRUST COMPANY, N.A.

    as
      Trustee

    

    

    By: /s/John
      Stohlmann        

    Authorized
      Signatory

    

    

    ATTEST:

    

    By:
/s/
      Patrick
      T. Giordano         

    Name:
Patrick
      T.
      Giordano     

    Title:
      Vice
      President         

    

    

     

    
      
        
          HOU:2509545.3
            

           

          Third
            Supplemental Indenture

           

        

        
        

      

      
        
        

        
          

        

      

      
        
        

        
        

      

    

    EXHIBIT
      A

     

    [FORM
      OF
      FACE OF NOTE]

     

    [If
      a
      Global Security, insert—UNLESS THIS NOTE IS PRESENTED BY AN AUTHORIZED
      REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY (“DTC”) (55 WATER STREET, NEW
      YORK, NEW YORK) TO THE ISSUER OR ITS AGENT FOR REGISTRATION OF TRANSFER,
      EXCHANGE OR PAYMENT AND ANY NOTE ISSUED IS REGISTERED IN THE NAME OF CEDE &
      CO., OR SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF
      DTC,
      AND ANY PAYMENT IS MADE TO CEDE & CO., OR TO SUCH OTHER ENTITY AS IS
      REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC, ANY TRANSFER, PLEDGE OR OTHER
      USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL, INASMUCH
      AS
      THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST
      HEREIN.]

     

    [If
      a
      Global Security, insert—UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR IN PART FOR
      THE INDIVIDUAL NOTES REGISTERED HEREBY, THIS GLOBAL NOTE MAY NOT BE TRANSFERRED
      EXCEPT AS A WHOLE BY DTC TO A NOMINEE OF DTC OR BY A NOMINEE OF DTC TO DTC
      OR
      ANOTHER NOMINEE OF DTC OR BY DTC OR ANY SUCH NOMINEE TO A SUCCESSOR OF DTC
      OR A
      NOMINEE OF SUCH SUCCESSOR.]

     

    [If
      a
      Transfer Restricted Security, insert—THIS NOTE HAS NOT BEEN REGISTERED UNDER THE
      U.S. SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”) AND, ACCORDINGLY,
      MAY NOT BE OFFERED, SOLD, PLEDGED OR OTHERWISE TRANSFERRED WITHIN THE UNITED
      STATES OR TO, OR FOR THE ACCOUNT OR BENEFIT OF, U.S. PERSONS, EXCEPT AS SET
      FORTH IN THE FOLLOWING SENTENCE. BY ITS ACQUISITION HEREOF OR OF A BENEFICIAL
      INTEREST HEREIN, THE HOLDER (1) REPRESENTS THAT (A) IT IS A “QUALIFIED
      INSTITUTIONAL BUYER” (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT) (A
“QIB”), (B) IT IS NOT A U.S. PERSON, IS NOT ACQUIRING THIS NOTE FOR THE ACCOUNT
      OR BENEFIT OF A U.S. PERSON AND IS ACQUIRING THIS NOTE IN AN OFFSHORE
      TRANSACTION IN COMPLIANCE WITH REGULATION S UNDER THE SECURITIES ACT OR (C)
      IT
      IS AN INSTITUTIONAL “ACCREDITED INVESTOR” (AS DEFINED IN RULE 501(A)(1), (2),
      (3) OR (7) OF REGULATION D UNDER THE SECURITIES ACT) (AN “IAI”), (2) AGREES THAT
      IT WILL NOT, WITHIN THE TIME PERIOD REFERRED TO UNDER RULE 144(k) (TAKING INTO
      ACCOUNT THE PROVISIONS OF RULE 144(d) UNDER THE SECURITIES ACT, IF APPLICABLE)
      UNDER THE SECURITIES ACT AS IN EFFECT ON THE DATE OF THE TRANSFER OF THIS NOTE,
      RESELL OR OTHERWISE TRANSFER THIS NOTE EXCEPT (A) TO THE ISSUER OR ANY
      SUBSIDIARY THEREOF, (B) TO A PERSON WHOM THE HOLDER REASONABLY BELIEVES IS
      A QIB
      PURCHASING FOR ITS OWN ACCOUNT OR FOR THE ACCOUNT OF A QIB IN COMPLIANCE WITH
      RULE 144A UNDER THE SECURITIES ACT, (C) OUTSIDE THE UNITED STATES IN AN OFFSHORE
      TRANSACTION IN COMPLIANCE WITH RULE 904 UNDER THE SECURITIES ACT, (D) PURSUANT
      TO THE EXEMPTION FROM REGISTRATION PROVIDED BY RULE 144 UNDER THE SECURITIES
      ACT
      (IF AVAILABLE), (E) TO AN IAI THAT, PRIOR TO SUCH TRANSFER, FURNISHES TO THE
      TRUSTEE A SIGNED LETTER CONTAINING CERTAIN REPRESENTATIONS AND AGREEMENTS
      RELATING TO THE REGISTRATION OF TRANSFER OF THIS NOTE (THE FORM OF WHICH LETTER
      CAN BE OBTAINED FROM THE TRUSTEE) AND, IF SUCH TRANSFER IS IN RESPECT OF AN
      AGGREGATE PRINCIPAL AMOUNT OF NOTES AT THE TIME OF TRANSFER OF LESS THAN
      $250,000, AN OPINION OF COUNSEL ACCEPTABLE TO THE ISSUER THAT SUCH TRANSFER
      IS
      IN COMPLIANCE WITH THE SECURITIES ACT OR (F) PURSUANT TO AN EFFECTIVE
      REGISTRATION STATEMENT UNDER THE SECURITIES ACT AND, IN EACH CASE, IN ACCORDANCE
      WITH APPLICABLE STATE SECURITIES LAWS, AND (3) AGREES THAT IT WILL DELIVER
      TO
      EACH PERSON TO WHOM THIS NOTE OR AN INTEREST HEREIN IS TRANSFERRED A NOTICE
      SUBSTANTIALLY TO THE EFFECT OF THIS LEGEND. IN CONNECTION WITH ANY TRANSFER
      OF
      THIS NOTE OR ANY INTEREST HEREIN WITHIN THE TIME PERIOD REFERRED TO ABOVE,
      THE
      HOLDER MUST CHECK THE APPROPRIATE BOX SET FORTH ON THE REVERSE HEREOF RELATING
      TO THE MANNER OF SUCH TRANSFER AND SUBMIT THIS CERTIFICATE TO THE TRUSTEE.
      AS
      USED HEREIN, THE TERMS “OFFSHORE TRANSACTION,”“UNITED STATES” AND “U.S. PERSON”
      HAVE THE MEANINGS GIVEN TO THEM BY RULE 902 OF REGULATION S UNDER THE SECURITIES
      ACT. THE INDENTURE CONTAINS A PROVISION REQUIRING THE TRUSTEE TO REFUSE TO
      REGISTER ANY TRANSFER OF THIS NOTE IN VIOLATION OF THE FOREGOING
      RESTRICTIONS.]

     

    COLORADO
      INTERSTATE GAS COMPANY

     

    6.80%
      Senior Note due 2015

     

    
      	
              Rate
                of Interest

               

            	
              Maturity
                Date

               

            	
              Original
                Issue Date

               

            
	
              6.80%

               

            	
              November
                15,
                2015

               

            	
              ________
                __,
                20__

               

            

    

    

     

    
      	
              No.
                _________

               

            	
              U.S.$_____________

               

            
	
              CUSIP
                No.
                ___________

               

            	 

    

    Colorado
      Interstate
      Gas Company, a corporation duly organized and existing under the laws of the
      State of Delaware (herein called the “Company”),
      for value
      received, hereby promises to pay to ___________________________________ or
      registered assigns, the principal sum of __________________________ on the
      maturity date shown above, and to pay interest thereon, at the annual rate
      of
      interest shown above, from the Original Issue Date shown above or from the
      most
      recent Interest Payment Date (as hereinafter defined) to which interest has
      been
      paid or duly provided for, payable semi-annually on May 15 and November 15
      of
      each year (each, an “Interest
      Payment Date”)
      and at such
      maturity date, commencing on the first such date after the Original Issue Date,
      except that if the Original Issue Date is on or after a Regular Record Date
      (as
      defined below) but before the next Interest Payment Date, interest payments
      will
      commence on the second Interest Payment Date following the Original Issue
      Date.

     

    The
      interest so
      payable, and punctually paid or duly provided for, on any Interest Payment
      Date
      will, as provided in the Indenture, be paid to the person in whose name this
      Note is registered at the close of business on the “Regular
      Record Date”
      for any such
      Interest Payment Date, which shall be the fifteenth calendar day (whether or
      not
      a Business Day) preceding the applicable Interest Payment Date. Any such
      interest not so punctually paid or duly provided for, and any interest payable
      on such defaulted interest (to the extent lawful), will forthwith cease to
      be
      payable to the Holder on such Regular Record Date and shall be paid to the
      person in whose name this Note is registered at the close of business on a
      special record date for the payment of such defaulted interest to be fixed
      by
      the Company, notice of which shall be given to Holders of Notes not less than
      15
      days prior to such special record date. Payment of the principal of and interest
      on this Note will be made at the agency of the Company maintained for that
      purpose in New York, New York and at any other office or agency maintained
      by
      the Company for such purpose, in United States dollars; provided,
however,
      that at the
      option of the Company payment of interest, other than interest due on the
      maturity date shown above, may be made by check mailed to the address of the
      person entitled thereto as such address shall appear in the Security
      Register.

     

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

     

    Unless
      the
      certificate of authentication hereon has been executed by the Trustee referred
      to on the reverse hereof by manual signature, this Note shall not be entitled
      to
      any benefit under the Indenture or be valid or obligatory for any
      purpose.

     

    (Signature
      Page
      Follows)

     

    
      
        
          HOU:2509545.3
            

           

          A-Third
            Supplemental Indenture

           

        

        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

    IN
      WITNESS WHEREOF,
      COLORADO INTERSTATE GAS COMPANY
      has caused this
      instrument to be executed in its corporate name by the signature of its duly
      authorized officers.

     

    COLORADO
      INTERSTATE
      GAS COMPANY

     

    

     

    By: /s/
      Daniel B. Martin                  

                            Name:  Daniel
      B. Martin 

                            Title:    
      Senior Vice President      

     

    ATTEST:

     

    

    By:
/s/
      Stacy J.
      James        

    Name: 
      Stacy J.
      James

    Title:    
      Corporate Secretary

    

     

    

     

    DATED:
     

     

    

     

    TRUSTEE’S
      CERTIFICATE OF AUTHENTICATION

     

    This
      is one of the
      6.80% Senior Notes due 2015 referred to in the within-mentioned
      Indenture.

     

    THE
      BANK OF NEW
      YORK TRUST COMPANY, N.A.

     

    as
      Trustee

     

    

     

    By:       

     

    Authorized
      Signatory

     

    

     

    [REVERSE
      OF
      NOTE]

     

    
      
        
          HOU:2509545.3
            

           

          A-Third
            Supplemental Indenture

           

        

        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

     

    COLORADO
      INTERSTATE GAS COMPANY

     

    6.80%
      Senior Note due 2015

     

    This
      Note is one of
      a duly authorized issue of securities of the Company (which term includes any
      successor corporation under the Indenture hereinafter referred to) designated
      as
      its 6.80% Senior Notes due 2015 (the “Notes”),
      issued or to be
      issued pursuant to an Indenture, dated as of June 27, 1997, between the Company
      and The Bank of New York Trust Company, N.A. (successor-in-interest to Harris
      Trust and Savings Bank), as Trustee (the “Trustee,”
      which term
      includes any successor trustee under such Indenture), as amended and
      supplemented by the First Supplemental Indenture thereto dated as of June 27,
      1997 and the Second Supplemental Indenture thereto dated as of March 9, 2005
      and
      as further amended and supplemented by the Third Supplemental Indenture thereto
      dated as of November 1, 2005 (such Indenture, as so amended and supplemented
      being referred to herein as the “Indenture”).
      The terms of
      this Note include those stated in the Indenture and those made part of the
      Indenture by reference to the Trust Indenture Act of 1939, as amended. Reference
      is hereby made to the Indenture and all further supplemental indentures thereto
      for a statement of the respective rights, limitation of rights, duties and
      immunities thereunder of the Company, the Trustee and the Holders and of the
      terms upon which the Notes are, and are to be, authenticated and delivered.
      

     

    This
      Note is a
      Series of Securities issued or to be issued by the Company under the Indenture.
      The Indenture provides that the Securities of the Company referred to therein
      (“Securities”),
      including the
      Notes, may be issued in one or more Series, which different Series may be issued
      in such aggregate principal amounts and on such terms (including, but not
      limited to, terms relating to interest rate or rates, provisions for determining
      such interest rate or rates and adjustments thereto, maturity, redemption
      (optional and mandatory), sinking fund, covenants and Events of Default) as
      may
      be provided in or pursuant to the Authorizing Resolutions and/or supplemental
      indenture (if any) relating to the several Series.

     

    This
      Note is
      redeemable, in whole or in part, at the Company’s option at any time prior to
      its Stated Maturity at a redemption price equal to the greater of (a) 100%
      of
      the principal amount of this Note, and (b) as determined by the Quotation Agent
      (as defined below), the sum of the present values of the remaining scheduled
      payments of principal and interest (not including any portion of those payments
      of interest accrued as of the date of redemption) discounted to the date of
      redemption on a semi-annual basis (assuming 360-day years, each consisting
      of
      twelve 30-day months), at the Adjusted Treasury Rate (as defined below) plus
      45
      basis points plus, in each case, accrued interest to the date of
      redemption.

     

    For
      purposes of
      determining any redemption price, the following definitions shall
      apply:

     

    “Adjusted
      Treasury Rate”
      means, with
      respect to any date of redemption, the rate per annum equal to the semi-annual
      equivalent yield to maturity of the Comparable Treasury Issue, assuming a price
      for the Comparable Treasury Issue (expressed as a percentage of its principal
      amount) equal to the Comparable Treasury Price for the date of
      redemption.

     

    “Comparable
      Treasury Issue”
      means the United
      States Treasury security selected by the Quotation Agent as having a maturity
      comparable to the remaining term of this Note that would be utilized, at the
      time of selection and in accordance with customary financial practice, in
      pricing new issues of corporate debt securities of comparable maturity to the
      remaining term of this Note.

     

    “Comparable
      Treasury Price”
      means, with
      respect to any date of redemption, (a) the average of the Reference Treasury
      Dealer Quotations for the date of redemption, after excluding the highest and
      lowest Reference Treasury Dealer Quotations, or (b) if the Trustee obtains
      fewer
      than three Reference Treasury Dealer Quotations, the average of all such
      Reference Treasury Dealer Quotations.

     

    “Quotation
      Agent”
      means Citigroup
      Global Markets Inc. or another Reference Treasury Dealer appointed by the
      Company.

     

    “Reference
      Treasury Dealer”
      means (a)
      Citigroup Global Markets Inc. and its respective successors; provided,
however,
      that if the
      foregoing shall cease to be a primary U.S. Government securities dealer in
      New
      York City (a “Primary
      Treasury Dealer”),
      the Company
      shall substitute another Primary Treasury Dealer; and (b) any other Primary
      Treasury Dealers selected by the Company.

     

    “Reference
      Treasury Dealer Quotations”
      means, with
      respect to each Reference Treasury Dealer and any date of redemption, the
      average, as determined by the Trustee, of the bid and asked prices for the
      Comparable Treasury Issue (expressed in each case as a percentage of its
      principal amount) quoted in writing to the Trustee by that Reference Treasury
      Dealer at 5:00 p.m., New York City time, on the third business day preceding
      that date of redemption.

     

    Unless
      the Company
      defaults in payment of the redemption price, on and after the date of
      redemption, interest will cease to accrue on this Note or the portions hereof
      called for redemption.

     

    In
      the event of
      redemption of this Note in part only, a new Note or Notes for the unredeemed
      portion hereof shall be issued in the name of the Holder hereof upon the
      surrender hereof.

     

    If
      an Event of
      Default, as defined in the Indenture and in the Authorizing Resolution and/or
      supplemental indenture (if any) relating to the Notes (if there shall be any
      additional Events of Default specified in respect of the Notes), shall occur
      and
      be continuing, the principal of all the Notes may be declared due and payable
      in
      the manner and with the effect provided in the Indenture.

     

    The
      Indenture
      permits, with certain exceptions as therein provided, the amendment thereof
      and
      the modification of the rights and obligations of the Company and the rights
      of
      the Holders of the Notes under the Indenture at any time by the Company and
      the
      Trustee with the consent of the Holders of a majority in aggregate principal
      amount of the Securities affected thereby, voting as a single class (which
      may
      include the Notes), at the time outstanding. The Indenture also contains
      provisions permitting the Holders of specified percentages in aggregate
      principal amount of the Securities at the time outstanding to waive compliance
      by the Company with certain provisions of the Indenture and certain past
      defaults under the Indenture and their consequences. Any such consent or waiver
      by the Holder of this Note shall be conclusive and binding upon such Holder
      and
      upon all future Holders of this Note and of any Note issued upon the
      registration of transfer hereof or in exchange herefor in lieu hereof, whether
      or not notation of such consent or waiver is made upon this Note.

     

    The
      Indenture
      provides that no Holder may pursue any remedy under the Indenture unless the
      Trustee shall have failed to act after notice of an Event of Default and written
      request by Holders of at least 25% in principal amount of the Securities of
      the
      applicable Series and the offer to the Trustee of indemnity satisfactory to
      it;
      however, such provision does not affect the right to sue for enforcement of
      any
      overdue payment on any Security.

     

    No
      reference herein
      to the Indenture and no provision of this Note or of the Indenture shall alter
      or impair the obligation of the Company, which is absolute and unconditional,
      to
      pay the principal of and interest on this Note at the times, places and rates,
      and in the coin or currency, herein prescribed.

     

    As
      provided in the
      Indenture and subject to certain limitations therein set forth, the transfer
      of
      this Note is registrable in the Security Register upon surrender of this Note
      for registration of transfer at the agency of the Company provided for that
      purpose duly endorsed by, or accompanied by a written instrument of transfer
      in
      substantially the form accompanying this Note duly executed by, the Holder
      hereof or his attorney duly authorized in writing, and thereupon one or more
      new
      Notes, of authorized denominations and for the same aggregate principal amount,
      will be issued to the designated transferee or transferees.

     

    The
      Notes are
      issuable only in registered form without coupons in denominations of $1,000
      and
      any integral multiple thereof. As provided in the Indenture and subject to
      certain limitations therein set forth, the Notes are exchangeable for a like
      aggregate principal amount of Notes of a different authorized denomination,
      as
      requested by the Holder surrendering the same.

     

    No
      service charge
      shall be made for any such registration of transfer or exchange, but the Company
      may require payment of a sum sufficient to cover any transfer tax or similar
      governmental charge payable in connection therewith (other than any such
      transfer taxes or similar governmental charge payable upon exchanges pursuant
      to
      Sections 2.11, 3A.08 or 9.05 of the Indenture, in which case such transfer
      taxes
      or similar governmental charges shall be paid by the Company).

     

    Prior
      to due
      presentment of this Note for registration of transfer, the Company, the Trustee
      and any agent of the Company or the Trustee may treat the person in whose name
      this Note is registered as the owner hereof for all purposes, whether or not
      this Note be overdue, and neither the Company, the Trustee nor any such agent
      shall be affected by notice to the contrary.

     

    All
      terms used in
      this Note which are defined in the Indenture shall have the meanings assigned
      to
      them in the Indenture.

     

    Customary
      abbreviations may be used in the name of a Note holder or any assignee, such
      as:
      TEN COM ( = tenants in common), TEN ENT ( = tenants by the entireties), JT
      TEN (
      = joint tenants with right of survivorship and not as tenants in common), CUST
      (
      = Custodian) and U/G/M/A ( = Uniform Gifts to Minors Act).

     

    The
      Company will
      furnish to any Note holder of record, upon written request, without charge,
      a
      copy of the Indenture. Requests may be made to: Colorado Interstate Gas Company,
      El Paso Building, 1001 Louisiana Street, Houston, Texas 77002, Attention:
      Corporate Secretary.

     

    [If
      a Transfer
      Restricted Security, insert—The Holder of this Note is entitled to the benefits
      of the Registration Rights Agreement dated as of November 1, 2005 (the
“Registration
      Rights Agreement”)
      by and among the
      Company and the Initial Purchasers named therein, and such Holders shall also
      have certain obligations to indemnify the Company under certain circumstances,
      all as more fully set forth in the Registration Rights Agreement. In certain
      events, the Company shall be required to pay to the Holder of this Note
      liquidated damages on this Note, on the terms and subject to the conditions
      of
      the Registration Rights Agreement.]

     

    This
      Note shall be
      governed by and construed in accordance with the laws of the State of New York
      without regard to principles of conflicts of law.

     

    

     

    
      
        
          HOU:2509545.3
            

           

          A-Third
            Supplemental Indenture

           

        

        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

    ASSIGNMENT
      FORM

     

    FOR
      VALUE RECEIVED,
      the undersigned hereby sell(s), assign(s) and transfer(s) unto
      _____________________________________ (Please Print or Typewrite Name and
      Address of Assignee) the within instrument of COLORADO INTERSTATE GAS COMPANY
      and does hereby irrevocably constitute and appoint ________________________
      Attorney to transfer said instrument on the books of the within-named Company,
      with full power of substitution in the premises.

     

    Please
      Insert
      Social Security or 

     

    Other
      Identifying
      Number of Assignee: 

     

     

    Dated:
             

     

    (Signature)
      

     

    

     

    Signature
      Guarantee:
      ____________________________________________________________________________

    (Participant
      in a Recognized
      Signature

    Guaranty
      Medallion
      Program)

     

    NOTICE:
      The
      signature to this assignment must correspond with the name as written upon
      the
      face of the within instrument in every particular, without alteration or
      enlargement or any change whatever.

     

    

     

    
      
        
          HOU:2509545.3
            

           

          A-Third
            Supplemental Indenture

           

        

        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

    EXCHANGE/TRANSFER
      CERTIFICATE

     

    Re: 6.80%
      Senior Notes
      due 2015 of Colorado Interstate Gas Company (the “Notes”).

     

    This
      Exchange/Transfer Certificate relates to $____ principal amount of Notes held
      by
      _____________________ (the “Transferor”).

     

    The
      Transferor has
      requested the Trustee by written order to exchange or register the transfer
      of a
      Note or Notes.

     

    In
      connection with
      such request and in respect of each such Note, the Transferor does hereby
      certify that the Transferor is familiar with the Indenture relating to the
      above-captioned Notes and that the transfer of this Note does not require
      registration under the Securities Act (as defined below) because:**

     

    ‪ Such
      Note is being
      acquired for the Transferor’s own account without transfer.

     

    ‪ Such
      Note is being
      transferred (i) to a “qualified institutional buyer” (as defined in Rule 144A
      under the Securities Act of 1933, as amended (the “Securities
      Act”)),
      in accordance
      with Rule 144A under the Securities Act or (ii) pursuant to an exemption from
      registration in accordance with Rule 904 of Regulation S under the Securities
      Act (and in the case of clause (ii), based upon an opinion of counsel if the
      Company or the Trustee so requests, together with a certification in
      substantially the form of the Regulation S Certificate included in such
      Note).

     

    ‪ Such
      Note is being
      transferred (i) pursuant to an exemption from registration in accordance with
      Rule 144 under the Securities Act (and based upon an opinion of counsel if
      the
      Company or the Trustee so requests) or (ii) pursuant to an effective
      registration statement under the Securities Act.

     

    ‪ Such
      Note is being
      transferred in reliance on and in compliance with another exemption from the
      registration requirements of the Securities Act (and based upon an opinion
      of
      counsel if the Company or the Trustee so requests).

     

    [INSERT
      NAME OF
      TRANSFEROR]

    

    By:

    Name:

    Title:

    Address:

    

    Date:
 

    

    **Check
      appropriate
      box.

     

    
      
        
          HOU:2509545.3
            

           

          A-Third
            Supplemental Indenture

           

        

        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

    REGULATION
      S CERTIFICATE

    

    _________________,
      _____

    

    The
      Bank of New
      York Trust Company, N.A., as Registrar

    600
      North Pearl
      Street, Suite 420

    Dallas,
      TX
      75201

     

    Attention:
      Corporate Trust Administration

     

    Ladies
      and
      Gentlemen:

     

    In
      connection with
      our proposed sale of $_______________ principal amount of 6.80% Senior Notes
      due
      2015 (the “Notes”)
      of Colorado
      Interstate Gas Company (the “Company”),
      we confirm that
      such sale has been effected pursuant to and in accordance with Regulation S
      under the United States Securities Act of 1933, as amended (the “Securities
      Act”),
      and,
      accordingly, we represent that:

     

    (i) the
      offer of the
      Notes was not made to a person in the United States of America;

     

    
      	 	
              (ii)

            	
              at
                the time
                the buy order was originated, the transferee was outside the United
                States
                of America or we and any person acting on our behalf reasonably believed
                that the transferee was outside the United States of
                America;

            

    

     

    
      	 	
              (iii)

            	
              no
                directed
                selling efforts have been made by us in contravention of Rule 903
                or Rule
                904 of Regulation S under the Securities Act, as
                applicable;

            

    

     

    
      	 	
              (iv)

            	
              the
                transaction is not part of a plan or scheme to evade the registration
                requirements of the Securities Act;
                and

            

    

     

    
      	 	
              (v)

            	
              if
                the
                proposed transfer is being made prior to the expiration of the 40-day
                distribution compliance period as set forth in Regulation S, the
                transfer
                is not being made to, or for the benefit or account of, a U.S. Person
                (other than a distributor).

            

    

     

    You
      and the Company
      are entitled to rely upon this Regulation S Certificate and you are irrevocably
      authorized to produce this Regulation S Certificate or a copy hereof to any
      interested party in any administrative or legal proceedings or official inquiry
      with respect to the matters covered hereby. Terms used but not defined in this
      Regulation S Certificate have the meanings set forth in Regulation S under
      the
      Securities Act.

     

    Very
      truly
      yours,

    

    

    [Name]

    

    By:

    Name:

    Title:

    Address:

    

     

    
      
        
          HOU:2509545.3
            

           

          A-Third
            Supplemental Indenture

           

        

        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

    [If
      a Global
      Security, insert as a separate page—

     

    SCHEDULE
      OF
      INCREASES OR DECREASES

     

    IN
      GLOBAL
      SECURITY

     

    The
      following
      increases or decreases in this Global Security have been made:

     

    
      	
               

               

               

               

               

               

               

               

              Date
                of Exchange

               

            	
              Amount
                of Decrease in Principal Amount of this Global
                Security

               

            	
              Amount
                of Increase in Principal Amount of this 

               

              Global
                Security

               

            	
              Principal
                Amount of this Global Security following such decrease
                

               

              (or
                increase)

               

            	
               

               

              Signature
                of authorized signatory of Trustee or Depository]Exhibit 10.A - Registration Rights Agreement

    EXHIBIT
      10.A

     

    Execution
      Version

    

     

    

     

    

     

    REGISTRATION
      RIGHTS AGREEMENT

     

    dated
      as
      of

     

    November
      1,
      2005

     

    among

     

    COLORADO
      INTERSTATE GAS COMPANY

     

    and

     

    CITIGROUP
      GLOBAL MARKETS INC.

    CREDIT
      SUISSE FIRST BOSTON LLC

    ABN
      AMRO
      INCORPORATED

    BNP
      PARIBAS

    GREENWICH
      CAPITAL MARKETS, INC.

    HVB
      CAPITAL
      MARKETS, INC.

    SG
      AMERICAS
      SECURITIES, LLC

     

    

     

    REGISTRATION
      RIGHTS AGREEMENT

     

    THIS
      REGISTRATION
      RIGHTS AGREEMENT (the “Agreement”)
      is made and
      entered into as of November 1, 2005, by and among COLORADO INTERSTATE GAS
      COMPANY (the “Company”),
      a corporation
      duly organized and existing under the laws of the State of Delaware, and the
      several initial purchasers listed on Schedule I hereto, (the “Initial
      Purchasers”).

     

    This
      Agreement is
      made pursuant to the Purchase Agreement dated October 27, 2005, by and among
      the
      Company and the Initial Purchasers (the “Purchase
      Agreement”),
      which provides
      for the sale by the Company to the Initial Purchasers of $400,000,000 principal
      amount of its 6.80% Senior Notes due 2015 (the “Securities”).
      The Securities
      are to be issued pursuant to the provisions of an Indenture dated as of June
      27,
      1997, as supplemented and amended by (i) the First Supplemental Indenture
      thereto dated as of June 27, 1997, (ii) the Second Supplemental Indenture
      thereto dated as of March 9, 2005 and (iii) the Third Supplemental Indenture
      thereto dated as of November 1, 2005 (as further amended, supplemented or
      otherwise modified from time to time, the “Indenture”)
      by and among the
      Company and The Bank of New York Trust Company, N.A., a national banking
      association, as trustee (the “Trustee”).

     

    In
      order to induce the Initial Purchasers to enter into the Purchase Agreement,
      the
      Company has agreed to provide to each Initial Purchaser and its direct and
      indirect transferees the registration rights with respect to the Securities
      set
      forth in this Agreement. The execution of this Agreement is a condition to
      the
      closing under the Purchase Agreement.

     

    In
      consideration of the foregoing, the parties hereto agree as
      follows:

     

    1.   Definitions.

     

    As
      used in this Agreement, the following capitalized defined terms shall have
      the
      following meanings:

     

    “1933
      Act”
      shall mean the
      Securities Act of 1933, as amended from time to time.

     

    “1934
      Act”
      shall mean the
      Securities Exchange Act of 1934, as amended from time to time.

     

    “Agreement”
      shall have the
      meaning set forth in the preamble.

     

    “Business
      Day”
      shall have the
      meaning set forth in Rule 13e-4(a)(3) under the 1934 Act.

     

    “Closing
      Date”
      shall mean the
      Closing Date as defined in the Purchase Agreement.

     

    “Company” shall
      have the
      meaning set forth in the preamble and shall also include the Company’s
      successors.

     

    “Exchange
      Dates”
      shall have the
      meaning set forth in Section 2(a)(ii).

     

    “Exchange
      Offer”
      shall mean the
      exchange offer by the Company of Exchange Securities for all Securities that
      are
      Registrable Securities pursuant to Section 2(a) hereof.

     

    “Exchange
      Offer Registration”
      shall mean a
      registration under the 1933 Act effected pursuant to Section 2(a)
      hereof.

     

    “Exchange
      Offer Registration Statement”
      shall mean a
      registration statement on Form S-4 (or, if applicable, on another appropriate
      form) relating to an offering of Exchange Securities pursuant to an Exchange
      Offer and all amendments and supplements to such registration statement, in
      each
      case including the Prospectus contained therein, all exhibits thereto and all
      material incorporated by reference therein.

     

    “Exchange
      Securities”
      shall mean any
      securities issued by the Company to be offered to Holders in exchange for
      Securities (pursuant to the Exchange Offer or otherwise) pursuant to an Exchange
      Offer Registration Statement containing terms identical in all material respects
      to the Securities for which they are exchanged (except that (i) interest thereon
      shall accrue from the last date on which interest was paid on the Securities
      or,
      if no such interest has been paid, from the date of issuance of the Securities,
      (ii) the Exchange Securities will not contain the legend appearing on the face
      of the Securities in the form recited in the Indenture and will not contain
      terms with respect to transfer restrictions and (iii) the Exchange Securities
      will not contain terms with respect to the payment of liquidated
      damages.

     

    “Holder”
      shall mean each
      Initial Purchaser, for so long as it owns any Registrable Securities, and each
      of its successors, assigns and direct and indirect transferees who become
      registered owners of Registrable Securities under the Indenture; provided
      that for purposes
      of Sections 4 and 5 of this Agreement, the term “Holder” shall include
      Participating Broker-Dealers (as defined in Section 4(a)).

     

    “Indemnified
      Party”
      shall have the
      meaning set forth in Section 5(c).

     

    “Indemnifying
      Party”
      shall have the
      meaning set forth in Section 5(c).

     

    “Indenture”
      shall have the
      meaning set forth in the preamble.

     

    “Initial
      Purchasers”
      shall have the
      meaning set forth in the preamble.

     

    “Liquidated
      Damages”
      shall have the
      meaning set forth in Section 2(e).

     

    “Majority
      Holders”
      shall mean the
      Holders of a majority of the aggregate principal amount of outstanding
      Registrable Securities; provided
      that, for purposes
      of Section 6(b), whenever the consent or approval of Holders of a specified
      percentage of Registrable Securities is required hereunder, Registrable
      Securities held by the Company or any of its affiliates (as such term is defined
      in Rule 405 under the 1933 Act) (other than the Initial Purchasers or subsequent
      Holders of Registrable Securities if such subsequent Holders are deemed to
      be
      such affiliates solely by reason of their holding of such Registrable
      Securities) shall not be considered outstanding and shall not be counted in
      determining whether such consent or approval was given by the Holders of such
      required percentage or amount.

     

    “Participant”
      shall have the
      meaning set forth in Section 5(a).

     

    “Participating
      Broker-Dealer”
      shall have the
      meaning set forth in Section 4(a) hereof.

     

    “Person”
      shall mean an
      individual, partnership, limited liability company, corporation, trust or
      unincorporated organization, or a government or agency or political subdivision
      thereof.

     

    “Prospectus”
      shall mean the
      prospectus included in a Registration Statement, including any preliminary
      prospectus, and any such prospectus as amended or supplemented by any prospectus
      supplement, including a prospectus supplement with respect to the terms of
      the
      offering of any portion of the Registrable Securities covered by a Shelf
      Registration Statement, and by all other amendments and supplements to such
      prospectus, and in each case including all material incorporated by reference
      therein.

     

    “Purchase
      Agreement”
      shall have the
      meaning set forth in the preamble.

     

    “Registrable
      Securities”
      shall mean the
      Securities; provided,
      however,
      that the
      Securities shall cease to be Registrable Securities when (i) a Registration
      Statement with respect to such Securities shall have been declared effective
      under the 1933 Act and such Securities shall have been exchanged for Exchange
      Securities pursuant to an Exchange Offer Registration Statement or disposed
      of
      pursuant to a Shelf Registration Statement, as applicable, (ii) such Securities
      have been sold to the public pursuant to Rule 144 under the 1933 Act or are
      saleable pursuant to Rule 144(k)(or any similar provision then in force, but
      not
      Rule 144A) under the 1933 Act or (iii) such Securities shall have ceased to
      be
      outstanding.

     

    “Registration
      Default”
      shall have the
      meaning set forth in Section 2(e).

     

    “Registration
      Expenses”
      shall mean any
      and all expenses incident to performance of or compliance by the Company with
      this Agreement, including without limitation: (i) all SEC, stock exchange or
      National Association of Securities Dealers, Inc. registration and filing fees,
      (ii) all fees and expenses incurred in connection with compliance with state
      securities or blue sky laws (including reasonable fees and disbursements of
      counsel for any underwriters or Holders in connection with blue sky
      qualification of any of the Exchange Securities or Registrable Securities),
      (iii) all expenses of any Person in preparing or assisting in preparing, word
      processing, printing and distributing any Registration Statement, any
      Prospectus, any amendments or supplements thereto, any underwriting agreements,
      securities sales agreements and other documents relating to the performance
      of
      and compliance with this Agreement, (iv) all rating agency fees, (v) all fees
      and disbursements relating to the qualification of the Indenture under
      applicable securities laws, (vi) the fees and disbursements of the Trustee
      and
      its counsel, (vii) the fees and disbursements of counsel for the Company and,
      in
      the case of a Shelf Registration Statement, the reasonable fees and
      disbursements of one counsel for the Holders (which counsel shall be selected
      by
      the Majority Holders and which counsel may also be counsel for the Initial
      Purchasers) and (viii) the fees and disbursements of the independent public
      accountants of the Company, including the expenses of any special audits or
      “cold comfort” letters required by or incident to such performance and
      compliance, but excluding fees of counsel to the Underwriters (other than the
      fees and expenses set forth in clause (ii) above) and the Holders and
      underwriting discounts and commissions and transfer taxes, if any, relating
      to
      the sale or disposition of Registrable Securities by a Holder.

     

    “Registration
      Statement”
      shall mean any
      registration statement of the Company that covers any of the Exchange Securities
      or the Registrable Securities pursuant to the provisions of this Agreement
      and
      all amendments and supplements to any such Registration Statement, including
      post-effective amendments, in each case including the Prospectus contained
      therein, all exhibits thereto and all material incorporated by reference
      therein.

     

    “SEC”
      shall mean the
      Securities and Exchange Commission.

     

    “Securities”
      shall have the
      meaning set forth in the preamble.

     

    “Shelf
      Registration”
      shall mean a
      registration effected pursuant to Section 2(b) hereof.

     

    “Shelf
      Registration Statement”
      shall mean a
“shelf” registration statement of the Company pursuant to the provisions of
      Section 2(b) of this Agreement which covers all of the Registrable Securities
      (but no other securities unless approved by the Holders of a majority of the
      aggregate principal amount of outstanding Registrable Securities that are
      covered by such Shelf Registration Statement) on an appropriate form under
      Rule
      415 under the 1933 Act, or any similar rule that may be adopted by the SEC,
      and
      all amendments and supplements to such registration statement, including
      post-effective amendments, in each case including the Prospectus contained
      therein, all exhibits thereto and all material incorporated by reference
      therein.

     

    “TIA”
      shall have the
      meaning set forth in Section 3(1) hereof.

     

    “Trustee”
      shall have the
      meaning set forth in the preamble.

     

    “Underwriter”
      shall have the
      meaning set forth in Section 3 hereof.

     

    “Underwritten
      Registration or Underwritten Offering” shall
      mean a
      registration in which Registrable Securities are sold to an Underwriter for
      reoffering to the public.

     

    2.   Registration
      under the 1933 Act.

     

    (a)   To
      the extent
      not prohibited by any applicable law or applicable interpretation of the staff
      of the SEC, the Company shall (1) cause to be filed an Exchange Offer
      Registration Statement within 165 days following the Closing Date covering
      the
      offer by the Company to the Holders to exchange all of the Registrable
      Securities for an equal aggregate principal amount of Exchange Securities and
      (2) use its reasonable best efforts to cause such Exchange Offer Registration
      Statement to become effective within 240 days following the Closing Date. The
      Company shall use its reasonable best efforts to have the Exchange Offer
      Registration Statement remain effective until the closing of the Exchange Offer.
      The Company shall commence the Exchange Offer promptly after the Exchange Offer
      Registration Statement has been declared effective by the SEC and use its
      reasonable best efforts to have the Exchange Offer consummated not later than
      30
      Business Days after such effective date. The Company shall commence the Exchange
      Offer by mailing the related exchange offer Prospectus and accompanying
      documents to each Holder stating, in addition to such other disclosures as
      are
      required by applicable law:

     

    (i)    that
      the Exchange Offer is being made pursuant to this Agreement and that all
      Registrable Securities validly tendered will be accepted for
      exchange;

     

    (ii)    the
      dates of acceptance for exchange (which shall be a period of at least 20
      Business Days from the date such notice is mailed) (the “Exchange
      Dates”);

     

    (iii)    that
      any Registrable Security not tendered will remain outstanding and continue
      to
      accrue interest, but will not retain any rights under this
      Agreement;

     

    (iv)    that
      Holders electing to have a Registrable Security exchanged pursuant to the
      Exchange Offer will be required to surrender such Registrable Security, together
      with the enclosed letters of transmittal, to the institution and at the address
      specified in the notice prior to the close of business on the last Exchange
      Date; and

     

    (v)    that
      Holders will be entitled to withdraw their election, not later than the close
      of
      business on the last Exchange Date, by sending to the institution and at the
      address (located in the Borough of Manhattan, The City of New York) specified
      in
      the notice, a telegram, telex, facsimile transmission or letter setting forth
      the name of such Holder, the principal amount of Registrable Securities
      delivered for exchange and a statement that such Holder is withdrawing his
      election to have such Registrable Securities exchanged.

     

    As
      soon as practicable after the last Exchange Date, the Company
      shall:

     

    (A)  accept
      for exchange
      Registrable Securities or portions thereof tendered and not validly withdrawn
      pursuant to the Exchange Offer; and

     

    (B)  deliver,
      or cause
      to be delivered, to the Trustee for cancellation all Registrable Securities
      or
      portions thereof so accepted for exchange by the Company and issue, and cause
      the Trustee to promptly authenticate and mail to each Holder, an Exchange
      Security equal in aggregate principal amount to the aggregate principal amount
      of the Registrable Securities surrendered by such Holder.

     

    The
      Company shall
      use its reasonable best efforts to complete the Exchange Offer as provided
      above
      and shall comply with the applicable requirements of the 1933 Act, the 1934
      Act
      and other applicable laws and regulations in connection with the Exchange Offer.
      The Exchange Offer shall not be subject to any conditions, other than that
      the
      Exchange Offer does not violate applicable law or any applicable interpretation
      of the staff of the SEC. The Company shall inform the Initial Purchasers of
      the
      names and addresses of the Holders to whom the Exchange Offer is made, and
      the
      Initial Purchasers shall have the right, subject to applicable law, to contact
      such Holders and otherwise facilitate the tender of Registrable Securities
      in
      the Exchange Offer.

     

    If,
      during the
      period the Exchange Offer Registration Statement is effective, an event occurs
      which makes any statement made in such Exchange Offer Registration Statement
      or
      the related Prospectus untrue in any material respect or which requires the
      making of any changes in such Exchange Offer Registration Statement in order
      to
      make the statements therein not misleading or in such Prospectus in order to
      make the statements therein, in the light of the circumstances under which
      they
      were made, not misleading, the Company shall use its reasonable best efforts
      to
      prepare and file with the SEC a supplement or post-effective amendment to the
      Exchange Offer Registration Statement or the related Prospectus or any document
      incorporated therein by reference or file any other required document so that,
      as thereafter delivered to the purchasers of the Registrable Securities, such
      Prospectus will not contain any untrue statement of a material fact or omit
      to
      state a material fact necessary to make the statements therein, in the light
      of
      the circumstances under which they were made, not misleading. The Company agrees
      to notify the Holders to suspend the exchange of the Registrable Securities
      as
      promptly as practicable after the occurrence of such an event, and the Holders
      hereby agree to suspend such exchange until the Company has amended or
      supplemented the Prospectus to correct such misstatement or
      omission.

     

    (b)  If
      (i) the Company
      determines that the Exchange Offer Registration provided for in Section 2(a)
      above is not available or may not be consummated as soon as practicable after
      the last Exchange Date because it would violate applicable law or the applicable
      interpretations of the staff of the SEC, (ii) the Exchange Offer is not for
      any
      other reason consummated within 310 days following the Closing Date or (iii)
      in
      the written opinion of counsel for the Holders a Shelf Registration Statement
      must be filed and a Prospectus must be delivered by any Holder in connection
      with any reoffering or resale of Registrable Securities, the Company shall
      (x)
      file with the SEC within 75 days following such determination, date or notice
      of
      such opinion of counsel is given to the Company a Shelf Registration Statement
      providing for the resale by the Holders (other than those who fail to comply
      with the paragraph immediately following clause (p) of Section 3) of all of
      their Registrable Securities and (y) use its reasonable best efforts to cause
      such Shelf Registration Statement to become effective within 60 days of the
      filing of such Shelf Registration Statement. If the Company is required to
      file
      a Shelf Registration Statement solely as a result of the matters referred to
      in
      clause (iii) of the preceding sentence, the Company shall use its reasonable
      best efforts to file and have declared effective by the SEC both an Exchange
      Offer Registration Statement pursuant to Section 2(a) with respect to all
      Registrable Securities and a Shelf Registration Statement (which may be a
      combined Registration Statement with the Exchange Offer Registration Statement)
      with respect to reoffers and resales of Registrable Securities held by the
      Holders who must deliver the related Prospectus. The Company agrees to use
      its
      reasonable best efforts to keep the Shelf Registration Statement continuously
      effective until the expiration of the period referred to in Rule 144(k) of
      the
      1933 Act with respect to the Registrable Securities or such shorter period
      that
      will terminate when all of the Registrable Securities covered by the Shelf
      Registration Statement have been sold pursuant to the Shelf Registration
      Statement or cease to be Registrable Securities within the meaning of this
      Agreement. The Company further agrees to supplement or amend the Shelf
      Registration Statement if required by the rules, regulations or instructions
      applicable to the registration form used by the Company for such Shelf
      Registration Statement or by the 1933 Act or by any other rules and regulations
      thereunder for shelf registration or if reasonably requested by a Holder with
      respect to information relating to such Holder, and to use its reasonable best
      efforts to cause any such amendment to become effective and such Shelf
      Registration Statement to become usable as soon as thereafter practicable.
      The
      Company agrees to furnish to the Holders of Registrable Securities copies of
      any
      such supplement or amendment promptly after its being used or filed with the
      SEC.

     

    (c)  The
      Company shall
      pay all Registration Expenses in connection with the registration pursuant
      to
      Section 2(a) or Section 2(b). Each Holder shall pay all underwriting discounts,
      if any, and commissions and transfer taxes, if any, relating to the sale or
      disposition of such Holder’s Registrable Securities pursuant to a Shelf
      Registration Statement.

     

    (d)  An
      Exchange Offer
      Registration Statement pursuant to Section 2(a) hereof or a Shelf Registration
      Statement pursuant to Section 2(b) hereof will not be deemed to have become
      effective unless it has been declared effective by the SEC; provided,
      however,
      that, if, after
      it has been declared effective, the offering of Registrable Securities pursuant
      to a Shelf Registration Statement is interfered with by any stop order,
      injunction or other order or requirement of the SEC or any other governmental
      agency or court, such Registration Statement will be deemed not to have become
      effective during the period of such interference until the offering of
      Registrable Securities pursuant to such Registration Statement may legally
      resume.

     

    (e)  The
      Company and the
      Initial Purchasers agree that the Holders will suffer damages if the Company
      fails to fulfill its obligations under Section 2(a) or Section 2(b) hereof
      and
      that it would not be feasible to ascertain the extent of such damages with
      precision. Accordingly, the Company agrees that if:

     

    (i)    the
      Exchange Offer Registration Statement is not filed with the SEC on or prior
      to
      the 165th
      day following the
      Closing Date,

     

    (ii)    the
      Exchange Offer Registration Statement is not declared effective on or prior
      to
      the 240th
      day following the
      Closing Date,

     

    (iii)    the
      Exchange Offer is not completed on or prior to the 310th
      day following the
      Closing Date, or

     

    (iv)    the
      Shelf Registration Statement is required to be filed but is not filed or
      declared effective within the time period set forth herein or is declared
      effective but thereafter ceases to be effective or usable prior to the
      expiration of the period referred to in Rule 144(k) with respect to the
      Registrable Securities other than after the Registrable Securities have been
      disposed of under the Shelf Registration Statement or cease to be Registrable
      Securities, without being succeeded within two Business Days by a post-effective
      amendment which cures the failure and that is itself immediately declared
      effective, 

     

    (each
      such event
      referred to in clauses (i) through (iv) a “Registration
      Default”),
      liquidated
      damages (“Liquidated
      Damages”)
      will accrue on
      the affected Registrable Securities and the affected Exchange Securities, as
      applicable. The rate of Liquidated Damages will be 0.25% per annum of the
      principal amount of Registrable Securities held by such Holder for the first
      90-day period immediately following the occurrence of a Registration Default,
      increasing by 0.25% per annum with respect to each subsequent 90-day period,
      up
      to a maximum of 1.00% per annum, from and including the date on which any such
      Registration Default shall occur to, but excluding, the earlier of (1) the
      date
      on which all Registration Defaults have been cured or (2) the date on which
      all
      the Registrable Securities and Exchange Securities otherwise become freely
      transferable by Holders other than affiliates of the Company without further
      registration under the 1933 Act.

     

    Notwithstanding
      the
      foregoing, (1) the amount of Liquidated Damages payable shall not increase
      because more than one Registration Default has occurred and is pending and
      (2) a
      Holder of Registrable Securities or Exchange Securities who is not entitled
      to
      the benefits of the Shelf Registration Statement (i.e., such Holder has not
      elected to including information) shall not be entitled to Liquidated Damages
      with respect to a Registration Default that pertains to the Shelf Registration
      Statement.

     

    (f)  The
      Company shall
      notify the Trustee within one Business Day after each date on which an event
      occurs in respect of which Liquidated Damages are required to be paid. Any
      amounts of Liquidated Damages due pursuant to this Section 2 will be payable
      in
      addition to any other interest payable from time to time with respect to the
      Registrable Securities in cash semi-annually on the interest payment dates
      specified in the Indenture (to the holders of record as specified in the
      Indenture), commencing with the first such interest payment date occurring
      after
      any such Liquidated Damages commence to accrue. The amount of Liquidated Damages
      will be determined in a manner consistent with the calculation of interest
      under
      the Indenture.

     

    (g)  Without
      limiting
      the remedies available to the Holders, the Company acknowledges that any failure
      by the Company to comply with its obligations under Section 2(a) and Section
      2(b) hereof may result in material irreparable injury to the Holders for which
      there is no adequate remedy at law, that it will not be possible to measure
      damages for such injuries precisely and that, in the event of any such failure,
      the Initial Purchasers or any Holder may obtain such relief as may be required
      to specifically enforce the Company’s obligations under Section 2(a) and Section
      2(b) hereof.

     

    3.   Registration
      Procedures.

     

    In
      connection with the obligations of the Company with respect to the Registration
      Statements pursuant to Section 2(a) and Section 2(b) hereof, the Company shall
      as expeditiously as possible (provided, however, that the Company shall not
      be
      required to take actions more promptly than required by Sections 2(a) and
      2(b)):

     

    (a)   prepare
      and
      file with the SEC a Registration Statement on the appropriate form under the
      1933 Act, which form shall (x) be selected by the Company, (y) in the case
      of a
      Shelf Registration, be available for the sale of the Registrable Securities
      by
      the selling Holders thereof and (z) comply as to form in all material respects
      with the applicable requirements of the 1933 Act and rules and regulations
      promulgated thereunder and include all financial statements required by the
      SEC
      to be filed therewith, and use reasonable best efforts to cause such
      Registration Statement to become effective and remain effective in accordance
      with Section 2 hereof;

     

    (b)   prepare
      and
      file with the SEC such amendments and post-effective amendments to each
      Registration Statement as may be necessary to keep such Registration Statement
      effective for the applicable period and cause each Prospectus to be supplemented
      by any required prospectus supplement and, as so supplemented, to be filed
      pursuant to Rule 424 under the 1933 Act; and keep each Prospectus current during
      the period described under Section 4(3) and Rule 174 under the 1933 Act that
      is
      applicable to transactions by brokers or dealers with respect to the Registrable
      Securities or Exchange Securities;

     

    (c)   in
      the case
      of a Shelf Registration, furnish to each Holder of Registrable Securities,
      to
      counsel for the Initial Purchasers and to counsel for the Holders and to each
      Underwriter of an Underwritten Offering of Registrable Securities, if any,
      without charge, as many copies of each Prospectus, including each preliminary
      Prospectus and any amendment or supplement thereto and such other documents
      as
      such Holder or Underwriter may reasonably request, in order to facilitate the
      public sale or other disposition of the Registrable Securities; and, subject
      to
      Section 3(i), the Company consents to the use of such Prospectus and any
      amendment or supplement thereto in accordance with applicable law by each of
      the
      selling Holders of Registrable Securities and any such Underwriters in
      connection with the offering and sale of the Registrable Securities covered
      by
      and in the manner described in such Prospectus or any amendment or supplement
      thereto in accordance with applicable law;

     

    (d)    use
      its
      reasonable best efforts to register or qualify the Registrable Securities under
      all applicable state securities or blue sky laws of such jurisdictions as any
      Holder of Registrable Securities covered by a Registration Statement shall
      reasonably request in writing by the time the applicable Registration Statement
      is declared effective by the SEC, and to cooperate with such Holders in
      connection with any filings required to be made with the National Association
      of
      Securities Dealers, Inc. and do any and all other acts and things which may
      be
      reasonably necessary or advisable to enable such Holder to consummate the
      disposition in each such jurisdiction of such Registrable Securities owned
      by
      such Holder; provided,
      however,
      that the Company
      shall not be required to (i) qualify as a foreign corporation or as a dealer
      in
      securities in any jurisdiction where it would not otherwise be required to
      qualify but for this Section 3(d), (ii) file any general consent to service
      of
      process or (iii) subject itself to taxation in any such jurisdiction if it
      is
      not so subject;

     

    (e)   in
      the case
      of a Shelf Registration, notify each Holder of Registrable Securities, counsel
      for the Holders and counsel for the Initial Purchasers (or, if applicable,
      separate counsel for the Holders) promptly and, if requested by any such Holder
      or counsel, confirm such advice in writing, (i) when a Registration Statement
      has become effective and when any post-effective amendment thereto has been
      filed and becomes effective, (ii) of any request by the SEC or any state
      securities authority for amendments and supplements to a Registration Statement
      and Prospectus or for additional information after the Registration Statement
      has become effective, (iii) of the issuance by the SEC or any state securities
      authority of any stop order suspending the effectiveness of a Registration
      Statement or the initiation of any proceedings for that purpose, (iv) if,
      between the effective date of a Registration Statement and the closing of any
      sale of Registrable Securities covered thereby, the representations and
      warranties of the Company contained in any underwriting agreement, securities
      sales agreement or other similar agreement, if any, relating to the offering
      cease to be true and correct in all material respects or if the Company receives
      any notification with respect to the suspension of the qualification of the
      Registrable Securities for sale in any jurisdiction or the initiation of any
      proceeding for such purpose, (v) of the happening of any event during the period
      a Shelf Registration Statement is effective which makes any statement made
      in
      such Shelf Registration Statement or the related Prospectus untrue in any
      material respect or which requires the making of any changes in such
      Registration Statement in order to make the statements therein not misleading
      or
      in such Prospectus in order to make the statements therein, in the light of
      the
      circumstances under which they were made, not misleading and (vi) of any
      determination by the Company that a post-effective amendment to a Registration
      Statement would be appropriate;

     

    (f)   use
      its
      reasonable best efforts to obtain the withdrawal of any order suspending the
      effectiveness of a Registration Statement at the earliest possible moment and
      provide immediate notice to each Holder of the withdrawal of any such
      order;

     

    (g)   in
      the case
      of a Shelf Registration, furnish to each Holder of Registrable Securities,
      without charge, at least one conformed copy of each Registration Statement
      and
      any post-effective amendment thereto (without documents incorporated therein
      by
      reference or exhibits thereto, unless requested in writing);

     

    (h)   in
      the case
      of a Shelf Registration, cooperate with the selling Holders of Registrable
      Securities to facilitate the timely preparation and delivery of certificates
      representing Registrable Securities to be sold and not bearing any restrictive
      legends (unless required by applicable securities laws) and enable such
      Registrable Securities to be in such denominations (consistent with the
      provisions of the Indenture) and registered in such names as the selling Holders
      may reasonably request at least two Business Days prior to the closing of any
      sale of Registrable Securities;

     

    (i)   in
      the case
      of a Shelf Registration, upon the occurrence of any event contemplated by
      Section 3(e)(v) hereof, use its reasonable best efforts to prepare and file
      with
      the SEC a supplement or post-effective amendment to a Registration Statement
      or
      the related Prospectus or any document incorporated therein by reference or
      file
      any other required document so that, as thereafter delivered to the purchasers
      of the Registrable Securities, such Prospectus will not contain any untrue
      statement of a material fact or omit to state a material fact necessary to
      make
      the statements therein, in the light of the circumstances under which they
      were
      made, not misleading. The Company agrees to notify the Holders to suspend use
      of
      the Prospectus as promptly as practicable after the occurrence of such an event,
      and the Holders hereby agree to suspend use of the Prospectus until the Company
      has amended or supplemented the Prospectus to correct such misstatement or
      omission and has furnished copies of the amended or supplemented Prospectus
      to
      the Holders or until the Company notifies the Holders that the sale of the
      Registrable Securities may be resumed;

     

    (j)   a
      reasonable
      time prior to the filing of any Registration Statement, any Prospectus, any
      amendment to a Registration Statement or amendment or supplement to a
      Prospectus, or any document which is to be incorporated by reference into a
      Registration Statement or Prospectus after the initial filing of a Registration
      Statement, provide copies of such document to the Initial Purchasers and their
      counsel (and, in the case of a Shelf Registration Statement, the Holders and
      their counsel) and make such of the representatives of the Company as shall
      be
      reasonably requested by the Initial Purchasers or their counsel (and, in the
      case of a Shelf Registration Statement, the Holders or their counsel) available
      for discussion of such document, and shall not at any time file or make any
      amendment to the Shelf Registration Statement, any Prospectus or any amendment
      of or supplement to a Shelf Registration Statement or a Prospectus or any
      document which is to be incorporated by reference into a Registration Statement
      or a Prospectus, of which the Initial Purchasers and their counsel (and, in
      the
      case of a Shelf Registration Statement, the Holders or their counsel) shall
      not
      have previously been advised and furnished a copy or to which the Initial
      Purchasers or their counsel (and, in the case of a Shelf Registration Statement,
      the Holders or their counsel) shall reasonably object;

     

    (k)   obtain
      a
      CUSIP number for all Exchange Securities or Registrable Securities, as the
      case
      may be, not later than the effective date of the applicable Registration
      Statement;

     

    (l)   cause
      the
      Indenture to be qualified under the Trust Indenture Act of 1939, as amended
      (the
“TIA”), in connection with the registration of the Exchange Securities or
      Registrable Securities, as the case may be, and cooperate with the Trustee
      and
      the Holders to effect such changes to the Indenture as may be required for
      the
      Indenture to be so qualified in accordance with the terms of the TIA and
      execute, and use commercially reasonable best efforts to cause the Trustee
      to
      execute, all documents as may be required to effect such changes and all other
      forms and documents required to be filed with the SEC to enable the Indenture
      to
      be so qualified in a timely manner;

     

    (m)   in
      the case
      of a Shelf Registration, make available for inspection by a representative
      of
      the Holders of the Registrable Securities, any Underwriter participating in
      any
      disposition pursuant to such Shelf Registration Statement, and attorneys and
      accountants designated by the Holders, at reasonable times and in a reasonable
      manner, all relevant financial and other records, pertinent documents and
      properties of the Company, and cause the respective officers, directors and
      employees of the Company to supply all information reasonably requested by
      any
      such representative, Underwriter, attorney or accountant in connection with
      a
      Shelf Registration Statement, in each case that would customarily be reviewed
      or
      examined in connection with “due diligence” review of the Company;

     

    (n)   use
      its
      reasonable best efforts to cause the Exchange Securities to continue to be
      rated
      by two nationally recognized statistical rating organizations (as such term
      is
      defined in Rule 436(g)(2) under the 1933 Act), if the Registrable Securities
      have been rated prior to the initial sale of such Registrable
      Securities;

     

    (o)   if
      reasonably
      requested by any Holder of Registrable Securities covered by a Registration
      Statement, (i) promptly incorporate in a Prospectus supplement or post-effective
      amendment such information with respect to such Holder as such Holder reasonably
      requests to be included therein and (ii) make all required filings of such
      Prospectus supplement or such post-effective amendment as soon as reasonably
      practicable after the Company has received notification of the matters to be
      incorporated in such filing; and

     

    (p)   in
      the case
      of a Shelf Registration, enter into such customary agreements and take all
      such
      other actions in connection therewith (including those reasonably requested
      by
      the Holders of a majority of the Registrable Securities being sold thereunder)
      in order to expedite or facilitate the disposition of such Registrable
      Securities thereunder including, but not limited to, pursuant to an Underwritten
      Offering and in such connection, (i) to the extent possible, make such
      representations and warranties to the Holders and any Underwriters of such
      Registrable Securities with respect to the business of the Company and its
      subsidiaries, the Registration Statement, Prospectus and documents incorporated
      by reference or deemed incorporated by reference, if any, in each case, in
      form,
      substance and scope as are customarily made by issuers to underwriters in
      underwritten offerings and confirm the same if and when requested, (ii) obtain
      opinions of counsel to the Company (which counsel and opinions, in form, scope
      and substance, shall be reasonably satisfactory to the Holders of a majority
      in
      principal amount of the Registrable Securities being sold under such Shelf
      Registration Statement, such Underwriters and their respective counsel)
      addressed to each selling Holder and Underwriter of Registrable Securities,
      covering the matters customarily covered in opinions requested in underwritten
      offerings, (iii) obtain “cold comfort” letters from the independent certified
      public accountants of the Company (and, if necessary, any other certified public
      accountant of any subsidiary of the Company, or of any business acquired by
      the
      Company for which financial statements and financial data are or are required
      to
      be included in the Registration Statement) addressed to each selling Holder
      and
      Underwriter of Registrable Securities, such letters to be in customary form
      and
      covering matters of the type customarily covered in “cold comfort” letters in
      connection with underwritten offerings, and (iv) deliver such documents and
      certificates as may be reasonably requested by the Holders of a majority in
      principal amount of the Registrable Securities being sold under such Shelf
      Registration Statement or by the Underwriters, and which are customarily
      delivered in underwritten offerings, to evidence the continued validity of
      the
      representations and warranties of the Company made pursuant to clause (i) above
      and to evidence compliance with any customary conditions contained in an
      underwriting agreement.

     

    In
      the case of a Shelf Registration Statement, the Company may require each Holder
      of Registrable Securities to furnish to the Company such information regarding
      the Holder and the proposed distribution by such Holder of such Registrable
      Securities as the Company may from time to time reasonably request in writing.
      No Holder of Registrable Securities may include its Registrable Securities
      in
      such Shelf Registration Statement unless and until such Holder furnishes such
      information to the Company. Each Holder including Registrable Securities in
      a
      Shelf Registration Statement shall agree to furnish promptly to the Company
      all
      information regarding such Holder and the proposed distribution by such Holder
      of such Registrable Securities required to make the information previously
      furnished to the Company by such Holder not materially misleading.

     

    In
      connection with an Exchange Offer Registration, each Holder exchanging
      Securities for Exchange Securities shall be required to represent that (i)
      the
      Exchange Securities are being obtained in the ordinary course of business of
      the
      Person receiving such Exchange Securities, whether or not such Person is a
      Holder, (ii) neither such Holder nor any such other Person has an arrangement
      or
      understanding with any Person to participate in the distribution of Securities
      or Exchange Securities, (iii) other than as set forth in Section 4, if the
      Holder is not a broker-dealer, or is a broker-dealer but will not receive
      Exchange Securities for its own account in exchange for Securities, neither
      the
      Holder nor any such other Person is engaged in or intends to participate in
      a
      distribution of the Exchange Securities and (iv) neither the Holder nor any
      such
      other Person is an “affiliate” of the Company within the meaning of Rule 405
      under the 1933 Act or, if such Person is an “affiliate,” that such Holder will
      comply with the registration and prospectus delivery requirements of the 1933
      Act to the extent applicable.

     

    In
      the case of a Shelf Registration Statement, each Holder agrees that, upon
      receipt of any notice from the Company of the happening of any event of the
      kind
      described in Section 3(e)(v) hereof, such Holder will forthwith discontinue
      disposition of Registrable Securities pursuant to a Registration Statement
      until
      such Holder’s receipt of the copies of the supplemented or amended Prospectus
      contemplated by Section 3(i) hereof, and, if so directed by the Company, such
      Holder will destroy or deliver to the Company (at its expense) all copies in
      its
      possession, other than permanent file copies then in such Holder’s possession,
      of the Prospectus covering such Registrable Securities current at the time
      of
      receipt of such notice.

     

    If
      the Company shall give any such notice to suspend the disposition of Registrable
      Securities pursuant to a Registration Statement, the Company shall extend the
      period during which the Registration Statement shall be maintained effective
      pursuant to this Agreement by the number of days during the period from and
      including the date of the giving of such notice to and including the date when
      the Holders shall have received copies of the supplemented or amended Prospectus
      necessary to resume such dispositions. The Company may give such notice so
      long
      as there are no more than 90 days during any 365 day period in which such
      suspensions are in effect.

     

    The
      Holders of
      Registrable Securities covered by a Shelf Registration Statement who desire
      to
      do so may sell such Registrable Securities in an Underwritten Offering. In
      any
      such Underwritten Offering, the investment banker or investment bankers and
      manager or managers (the “Underwriters”)
      that will
      administer the offering will be selected by the Majority Holders of the
      Registrable Securities included in such offering, provided
      that such
      Underwriters shall be reasonably acceptable to the Company.

     

    4.   Participation
      of
      Broker-Dealers in Exchange Offer.

     

    (a)   The
      parties
      hereto understand that the staff of the SEC has taken the position that any
      broker-dealer that receives Exchange Securities for its own account in the
      Exchange Offer in exchange for Securities that were acquired by such
      broker-dealer as a result of market-making or other trading activities (a
“Participating
      Broker-Dealer”),
      may be deemed
      to be an “underwriter” within the meaning of the 1933 Act and must deliver a
      prospectus meeting the requirements of the 1933 Act in connection with any
      resale of such Exchange Securities.

     

    The
      Company
      understands that it is currently the staff’s position that if the Prospectus
      contained in the Exchange Offer Registration Statement includes a plan of
      distribution containing a statement to the above effect and the means by which
      Participating Broker-Dealers may resell the Exchange Securities, without naming
      the Participating Broker-Dealers or specifying the amount of Exchange Securities
      owned by them, such Prospectus may be delivered by Participating Broker-Dealers
      to satisfy their prospectus delivery obligation under the 1933 Act in connection
      with resales of Exchange Securities for their own accounts, so long as the
      Prospectus otherwise meets the requirements of the 1933 Act.

     

    (b)   In
      light of
      the above, notwithstanding the other provisions of this Agreement, the Company
      agrees that the provisions of this Agreement as they relate to a Shelf
      Registration shall also apply to an Exchange Offer Registration to the extent,
      and with such reasonable modifications thereto as may be, reasonably requested
      by the Initial Purchasers or by one or more Participating Broker-Dealers, in
      each case as provided in clause (ii) below, in order to expedite or facilitate
      the disposition of any Exchange Securities by Participating Broker-Dealers
      consistent with the positions of the Staff recited in Section 4(a) above;
provided
      that:

     

    (i)    the
      Company shall not be required to amend or supplement the Prospectus contained
      in
      the Exchange Offer Registration Statement, as would otherwise be contemplated
      by
      Section 3(i), for a period exceeding 180 days after the last Exchange Date
      (as
      such period may be extended pursuant to the penultimate paragraph of Section
      3
      of this Agreement) and Participating Broker-Dealers shall not be authorized
      by
      the Company to deliver and shall not deliver such Prospectus after such period
      in connection with the resales contemplated by this Section 4; and

     

    (ii)    the
      application of the Shelf Registration procedures set forth in Section 3 of
      this
      Agreement to an Exchange Offer Registration, to the extent not required by
      the
      positions of the staff of the SEC or the 1933 Act and the rules and regulations
      thereunder, will be in conformity with the reasonable request in writing to
      the
      Company by the Initial Purchasers or with the reasonable request in writing
      to
      the Company by one or more broker-dealers who certify to the Initial Purchasers
      and the Company in writing that they anticipate that they will be Participating
      Broker-Dealers; and provided
      further
      that, in
      connection with such application of the Shelf Registration procedures set forth
      in Section 3 to an Exchange Offer Registration, the Company shall be obligated
      (x) to deal only with one entity representing the Participating Broker-Dealers,
      which shall be Citigroup Global Markets Inc. unless it elects not to act as
      such
      representative, (y) to pay the fees and expenses of only one counsel
      representing the Participating Broker-Dealers, which shall be counsel to the
      Initial Purchasers unless such counsel elects not to so act and (z) to cause
      to
      be delivered only one, if any, “cold comfort” letter with respect to the
      Prospectus in the form existing on the last Exchange Date and with respect
      to
      each subsequent amendment or supplement, if any, effected during the period
      specified in clause (i) above.

     

    (c)  The
      Initial
      Purchasers shall have no liability to the Company, other than as Holders in
      accordance with the terms hereof, or to any other Holder with respect to any
      request that they may make pursuant to Section 4(b) above.

     

    5.   Indemnification
      and Contribution.

     

    (a)   The
      Company
      agrees to indemnify and hold harmless the Initial Purchasers, each Holder and
      each Person, if any, who controls the Initial Purchasers or any Holder within
      the meaning of either Section 15 of the 1933 Act or Section 20 of the 1934
      Act,
      or is under common control with, or is controlled by, the Initial Purchasers
      or
      any Holder (each, a “Participant”),
      from and
      against all losses, claims, damages and liabilities (including, without
      limitation, any legal fees or other expenses reasonably incurred by a
      Participant in connection with defending or investigating any such action or
      claim) caused by any untrue statement or alleged untrue statement of a material
      fact contained in any Registration Statement (or any amendment thereto) pursuant
      to which Exchange Securities or Registrable Securities were registered under
      the
      1933 Act, including all documents incorporated therein by reference, or caused
      by any omission or alleged omission to state therein a material fact required
      to
      be stated therein or necessary to make the statements therein not misleading,
      or
      caused by any untrue statement or alleged untrue statement of a material fact
      contained in any Prospectus (as amended or supplemented if the Company shall
      have furnished any amendments or supplements thereto) forming a part of such
      Registration Statement, or caused by any omission or alleged omission to state
      therein a material fact necessary to make the statements therein, in the light
      of the circumstances under which they were made, not misleading, except insofar
      as such losses, claims, damages or liabilities are caused by any such untrue
      statement or omission or alleged untrue statement or omission based upon and
      in
      conformity with information relating to the Initial Purchasers or any Holder
      furnished to the Company in writing by the Initial Purchasers or any selling
      Holder expressly for use therein; provided
      that the foregoing
      indemnity with respect to any Prospectus shall not inure to the benefit of
      any
      Holder from whom the Person asserting any such losses, claims, damages or
      liabilities purchased Securities, or any Person controlling such Holder, if
      a
      copy of the final Prospectus (as then amended or supplemented if the Company
      shall have furnished any amendments or supplements thereto) was not sent by,
      or
      delivered on behalf of, such Holder to such Person at or prior to the written
      confirmation of the sale of the Securities to such Person, if the final
      Prospectus (as so amended or supplemented) would have cured the defect giving
      rise to such loss, claim, damage or liability. In connection with any
      Underwritten Offering permitted by Section 3, the Company will also enter into
      an underwriting agreement pursuant to which the Company will agree to indemnify
      the Underwriters, if any, selling brokers, dealers and similar securities
      industry professionals participating in such Underwritten Offering, their
      officers and directors and each Person who controls such Persons (within the
      meaning of either Section 15 of the 1933 Act or Section 20 of
      the 1934
      Act) to the same extent as provided above with respect to the indemnification
      of
      the Holders, if requested in connection with any Registration Statement for
      such
      Underwritten Offering.

     

    (b)   Each
      Holder
      agrees, severally and not jointly, to indemnify and hold harmless the Company,
      the Initial Purchasers and the other selling Holders, and each of their
      respective directors and officers who sign the Registration Statement and each
      Person, if any, who controls the Company, the Initial Purchasers and any other
      selling Holder within the meaning of either Section 15 of the 1933 Act or
      Section 20 of the 1934 Act to the same extent as the foregoing indemnity from
      the Company to the Initial Purchasers and the Holders pursuant to Section 5(a),
      but only with reference to information relating to such Holder furnished to
      the
      Company in writing by such Holder expressly for use in any Registration
      Statement (or any amendment thereto) or any Prospectus (or any amendment or
      supplement thereto).

     

    (c)   In
      case any
      proceeding (including any governmental investigation) shall be instituted
      involving any Person in respect of which indemnity may be sought pursuant to
      either paragraph (a) or paragraph (b) above, such Person (the “Indemnified
      Party”)
      shall promptly
      notify the Person against whom such indemnity may be sought (the “Indemnifying
      Party”)
      in writing, but
      the failure to so promptly notify the Indemnifying Party shall not negate the
      obligation to so indemnify such Indemnified Party unless the Indemnifying Party
      is materially prejudiced by such delay, and the Indemnifying Party, upon request
      of the Indemnified Party, shall retain counsel reasonably satisfactory to the
      Indemnified Party to represent the Indemnified Party and any others the
      Indemnifying Party may designate in such proceeding and shall pay the fees
      and
      expenses of such counsel related to such proceeding. In any such proceeding,
      any
      Indemnified Party shall have the right to retain its own counsel, but the fees
      and expenses of such counsel shall be at the expense of such Indemnified Party
      unless (i) the Indemnifying Party and the Indemnified Party shall have mutually
      agreed to the retention of such counsel or (ii) the named parties to any such
      proceeding (including any impleaded parties) include both the Indemnifying
      Party
      and the Indemnified Party and, in the opinion of counsel to the Indemnifying
      Party, representation of both parties by the same counsel would be inappropriate
      due to actual or potential differing interests between them. It is understood
      that the Indemnifying Party shall not, in connection with any proceeding or
      related proceedings in the same jurisdiction, be liable for (a) the fees and
      expenses of more than one separate firm (in addition to any local counsel)
      for
      the Initial Purchasers and all Persons, if any, who control the Initial
      Purchasers within the meaning of either Section 15 of the 1933 Act or Section
      20
      of the 1934 Act, (b) the fees and expenses of more than one separate firm (in
      addition to any local counsel) for the Company, its directors, its officers
      who
      sign the Registration Statement and each Person, if any, who controls the
      Company within the meaning of either such Section and (c) the fees and expenses
      of more than one separate firm (in addition to any local counsel) for all
      Holders and all Persons, if any, who control any Holders within the meaning
      of
      either such Section, and that all such fees and expenses shall be reimbursed
      as
      they are incurred. In such case involving the Initial Purchasers and Persons
      who
      control the Initial Purchasers, such firm shall be designated in writing by
      the
      Initial Purchasers. In such case involving the Holders and such Persons who
      control Holders, such firm shall be designated in writing by the Majority
      Holders. In all other cases, such firm shall be designated by the Company.
      The
      Indemnifying Party shall not be liable for any settlement of any proceeding
      effected without its written consent but, if settled with such consent or if
      there be a final judgment for the plaintiff, the Indemnifying Party agrees
      to
      indemnify the Indemnified Party from and against any loss or liability by reason
      of such settlement or judgment. No Indemnifying Party shall, without the prior
      written consent of the Indemnified Party, effect any settlement of any pending
      or threatened proceeding in respect of which such Indemnified Party is or could
      have been a party and indemnity could have been sought hereunder by such
      Indemnified Party, unless such settlement includes an unconditional release
      of
      such Indemnified Party from all liability on claims that are the subject matter
      of such proceeding.

     

    (d)   If
      the
      indemnification provided for in paragraph (a) or paragraph (b) of this Section
      5
      is unavailable to an Indemnified Party or insufficient in respect of any losses,
      claims, damages or liabilities, then each Indemnifying Party under such
      paragraph, in lieu of indemnifying such Indemnified Party thereunder, shall
      contribute to the amount paid or payable by such Indemnified Party as a result
      of such losses, claims, damages or liabilities in such proportion as is
      appropriate to reflect the relative fault of the Indemnifying Party or parties
      on the one hand and of the Indemnified Party or parties on the other hand in
      connection with the statements or omissions that resulted in such losses,
      claims, damages or liabilities, as well as any other relevant equitable
      considerations. The relative fault of the Company and the Holders shall be
      determined by reference to, among other things, whether the untrue or alleged
      untrue statement of a material fact or the omission or alleged omission to
      state
      a material fact relates to information supplied by the Company or by the Holders
      and the parties’ relative intent, knowledge, access to information and
      opportunity to correct or prevent such statement or omission. The Holders’
      respective obligations to contribute pursuant to this Section 5(d) are several
      in proportion to the respective principal amount of Registrable Securities
      of
      the applicable Holder that were registered pursuant to a Registration
      Statement.

     

    (e)   The
      Company
      and each Holder agree that it would not be just or equitable if contribution
      pursuant to Section 5(d) above were determined by pro rata allocation or by
      any
      other method of allocation that does not take account of the equitable
      considerations referred to in Section 5(d) above. The amount paid or payable
      by
      an Indemnified Party as a result of the losses, claims, damages and liabilities
      referred to in Section 5(d) above shall be deemed to include, subject to the
      limitations set forth above, any legal or other expenses reasonably incurred
      by
      such Indemnified Party in connection with investigating or defending any such
      action or claim. Notwithstanding the provisions of this Section 5, no Holder
      shall be required to indemnify or contribute any amount in excess of the amount
      by which the total price at which Registrable Securities were sold by such
      Holder exceeds the amount of any damages that such Holder has otherwise been
      required to pay by reason of such untrue or alleged untrue statement or omission
      or alleged omission. No Person guilty of fraudulent misrepresentation (within
      the meaning of Section 11(f) of the 1933 Act) shall be entitled to contribution
      from any Person who was not guilty of such fraudulent misrepresentation. The
      remedies provided for in this Section 5 are not exclusive and shall not limit
      any rights or remedies which may otherwise be available to any Indemnified
      Party
      at law or in equity.

     

    The
      indemnity and
      contribution provisions contained in this Section 5 shall remain operative
      and
      in full force and effect regardless of (i) any termination of this Agreement,
      (ii) any investigation made by or on behalf of the Initial Purchasers, any
      Holder or any Person controlling the Initial Purchasers or any Holder, or by
      or
      on behalf of the Company, its officers or directors or any Person controlling
      the Company, (iii) acceptance of any of the Exchange Securities and (iv) any
      sale of Registrable Securities pursuant to a Shelf Registration
      Statement.

     

    6.   Miscellaneous.

     

    (a)   No
      Inconsistent
      Agreements.
      The Company has
      not entered into, and on or after the date of this Agreement will not enter
      into, any agreement which is inconsistent with the rights granted to the Holders
      of Registrable Securities in this Agreement or otherwise conflicts with the
      provisions hereof. The rights granted to the Holders hereunder do not in any
      way
      conflict with and are not inconsistent with the rights granted to the holders
      of
      the Company’s other issued and outstanding securities under any such
      agreements.

     

    (b)   Amendments
      and
      Waivers.
      The provisions of
      this Agreement, including the provisions of this sentence, may not be amended,
      modified or supplemented, and waivers or consents to departures from the
      provisions hereof may not be given unless the Company has obtained the written
      consent of Holders of at least a majority in aggregate principal amount of
      the
      outstanding Registrable Securities affected by such amendment, modification,
      supplement, waiver or consent; provided,
      however,
      that no amendment,
      modification, supplement, waiver or consent to any departure from the provisions
      of Section 5 hereof or this paragraph (b) shall be effective as against any
      Holder of Registrable Securities unless consented to in writing by such
      Holder.

     

    (c)   Notices.
      All notices and
      other communications provided for or permitted hereunder shall be made in
      writing by hand-delivery, registered first-class mail, telecopier, or any
      courier guaranteeing overnight delivery (i) if to a Holder, at the most current
      address given by such Holder to the Company by means of a notice given in
      accordance with the provisions of this Section 6(c), which address initially
      is,
      with respect to the Initial Purchasers, the address set forth in the Purchase
      Agreement; and (ii) if to the Company, initially at the Company’s address set
      forth in the Purchase Agreement and thereafter at such other address, notice
      of
      which is given in accordance with the provisions of this Section
      6(c).

     

    All
      such notices
      and communications shall be deemed to have been duly given at the time delivered
      by hand, if personally delivered; five Business Days after being deposited
      in
      the mail, postage pre-paid, if mailed; when answered back, if telexed; when
      receipt is acknowledged, if telecopied; and on the next Business Day if timely
      delivered to an air courier guaranteeing overnight delivery.

     

    Copies
      of all such
      notices, demands, or other communications shall be concurrently delivered by
      the
      Person giving the same to the Trustee, at the address specified in the
      Indenture.

     

    (d)   Successors
      and
      Assigns.
      This Agreement
      shall inure to the benefit of, and be binding upon, the successors, assigns
      and
      transferees of each of the parties, including, without limitation and without
      the need for an express assignment, subsequent Holders of Registrable
      Securities; provided
      that nothing
      herein shall be deemed to permit any assignment, transfer or other disposition
      of Registrable Securities in violation of the terms of the Securities and the
      Purchase Agreement. If any transferee of any Holder shall acquire Registrable
      Securities, in any manner, whether by operation of law or otherwise, such
      Registrable Securities shall be held subject to all of the terms of this
      Agreement, and by taking and holding such Registrable Securities such Person
      shall be conclusively deemed to have agreed to be bound by and to perform all
      of
      the terms and provisions of this Agreement and such Person shall be entitled
      to
      receive the benefits hereof. The Initial Purchasers shall have no liability
      or
      obligation to the Company with respect to any failure by a Holder to comply
      with, or any breach by any other Holder of, any of the obligations of such
      Holder under this Agreement.

     

    (e)   Purchases
      and
      Sales of Securities.
      The Company shall
      not, and shall use its reasonable best efforts to cause its affiliates (as
      defined in Rule 405 under the 1933 Act) not to, purchase and then resell or
      otherwise transfer any Securities.

     

    (f)   Third
      Party
      Beneficiary.
      Each Holder shall
      be a third party beneficiary to the agreements made hereunder between the
      Company, on the one hand, and the Initial Purchasers, on the other hand, shall
      be bound by all of the terms and provisions of this Agreement and shall have
      the
      right to enforce such agreements directly to the extent it deems such
      enforcement necessary or advisable to protect its rights or the rights of
      Holders hereunder.

     

    (g)   Counterparts.
      This Agreement
      may be executed in any number of counterparts and by the parties hereto in
      separate counterparts, each of which when so executed shall be deemed to be
      an
      original and all of which taken together shall constitute one and the same
      agreement.

     

    (h)   Headings.
      The headings in
      this Agreement are for convenience of reference only and shall not limit or
      otherwise affect the meaning hereof.

     

    (i)   Governing
      Law.
      This Agreement
      shall be governed by, and construed in accordance with, the laws of the State
      of
      New York.

     

    (j)   Severability.
      In the event that
      any one or more of the provisions contained herein, or the application thereof
      in any circumstance, is held invalid, illegal or unenforceable the validity,
      legality and enforceability of any such provision in every other respect and
      of
      the remaining provisions contained herein shall not be affected or impaired
      thereby.

     

    
      
        
          --

        

        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

    IN
      WITNESS WHEREOF, the parties have executed this Agreement as of the date first
      written above.

     

    

     

    
      	 	
              COLORADO
                INTERSTATE GAS COMPANY

               

              By:
                /s/Daniel
                B. Martin 

            
	 	
              Name:
                Daniel
                B. Martin

              Title:
                Senior
                Vice President

            

    

    
      
        
          --

        

        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

    

    
      	
               

               

              Confirmed
                and
                accepted as of the date first above written:

               

              Citigroup
                Global Markets Inc.

              Credit
                Suisse
                First Boston LLC

              ABN
                AMRO
                Incorporated

              BNP
                Paribas

              Greenwich
                Capital Markets, Inc.

              HVB
                Capital
                Markets, Inc.

              SG
                Americas
                Securities, LLC

               

              By:
                Citigroup
                Global Markets Inc.

               

              By:
                 

              Name:

              Title::

               

            	 

    

    

     

    SCHEDULE
      I

     

    Initial
      Purchasers

     

    Citigroup
      Global
      Markets Inc.

    Credit
      Suisse First
      Boston LLC

    ABN
      AMRO
      Incorporated

    BNP
      Paribas

    Greenwich
      Capital
      Markets, Inc.

    HVB
      Capital
      Markets, Inc.

    SG
      Americas Securities, LLC

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