Document:

Second Amendment, dated as of March 31, 2006

 Exhibit 10.1 
 EXECUTION VERSION 
 SECOND AMENDMENT TO THE 
 UNCOMMITTED SECOND AMENDED AND RESTATED 
 CREDIT AGREEMENT 
 This SECOND AMENDMENT, dated as of March 31, 2006 (this “Amendment”) to the
UNCOMMITTED SECOND AMENDED AND RESTATED CREDIT AGREEMENT, dated as of March 30, 2005 (as amended by the First Amendment dated November 28, 2005 (the “First Amendment”) and as otherwise amended, restated, supplemented or
modified prior to the date hereof, the “Credit Agreement”) among ATMOS ENERGY MARKETING, LLC (f/k/a Woodward Marketing, L.L.C.), a Delaware limited liability company (the “Borrower”), the financial institutions from
time to time parties thereto (the “Banks”), FORTIS CAPITAL CORP., a Connecticut corporation (“Fortis”), as Joint Lead Arranger and Joint Bookrunner, as Administrative Agent for the Banks, as Collateral Agent, as an
Issuing Bank, and as a Bank, BNP PARIBAS, a bank organized under the laws of France (“BNP Paribas”), as Joint Lead Arranger and Joint Bookrunner, as Documentation Agent (together with the Administrative Agent, the
“Agents”), as an Issuing Bank and as a Bank, and SOCIÉTÉ GÉNÉRALE, as Syndication Agent and as a Bank. 
 WHEREAS, the Borrower has requested that the Credit Agreement be extended beyond its currently scheduled expiration of March 31, 2006; 
 WHEREAS, the Borrower has requested, in addition to an extension of the Credit Agreement, that the parties hereto make certain other amendments to the Credit Agreement on the terms and subject to the conditions set
forth herein; and 
 WHEREAS, the financial institutions party hereto have indicated their willingness to consider to lend such amounts and
to consider to continue to issue and to participate in such Letters of Credit on the terms and conditions of this Amendment; 
 NOW,
THEREFORE, in consideration of the premises herein contained and for other good and valuable consideration, the receipt and sufficiency of which is hereby acknowledged, the parties hereto hereby agree as follows: 
 1. Defined Terms. Unless otherwise defined herein, terms defined in the Credit Agreement and used herein shall have the meanings ascribed to them
in the Credit Agreement. 
 2. Amendment to Section 1.01 of the Credit Agreement. Section 1.01 of the Credit Agreement is
hereby amended by deleting the definitions of “Applicable Margin,” “Cumulative Loss,” “Dollar Advance Cap,” “Eligible Accounts,” “Eligible Exchange Receivables,” “Expiration Date,”
“Maturity Date”, “Tier I Account Party” and “Tier II Account Party” in their respective entireties and substituting in lieu thereof the following: 

 “Applicable Margin” means (i) with respect to Base Rate Loans,
..250% per annum and (ii) with respect to Offshore Rate Loans and Letters of Credit, for any day, the applicable rate per annum set forth below, based upon the Excess Tangible Net Worth determined as the last day of the most recently ended
fiscal quarter: 
  

							
	 Excess Tangible Net Worth
	  	Applicable
Margin for
Offshore
Rate Loans	 	 Applicable Margin for
 Letters of Credit (other
than Swap-Related
Standby Letters of
Credit)
	 	Applicable
Margin for
Swap-Related
Standby Letters
of Credit
	 Less than or equal to $25,000,000
	  	1.625%	 	1.375%	 	1.875%
	 Greater than $25,000,000 and less than or equal to $50,000,000
	  	1.500%	 	1.250%	 	1.750%
	 Greater than $50,000,000 and less or equal to $75,000,000
	  	1.375%	 	1.125%	 	1.625%
	 Greater than $75,000,000
	  	1.250%	 	1.000%	 	1.500%

 For the purposes of the foregoing, the Excess Tangible Net Worth shall be determined based upon the
Borrower’s most recent consolidated financial statements delivered pursuant to Section 7.01(c), and each change in the Applicable Margin resulting from a change in the Excess Tangible Net Worth shall be effective during the period
commencing on and including the date of delivery to the Administrative Agent of such consolidated financial statements indicating such change and ending on the date immediately preceding the effective date of the next such change; provided
that the Excess Tangible Net Worth shall be deemed to be less than or equal to $25,000,000 at any time that an Event of Default has occurred and is continuing. 
 “Cumulative Loss” means, as of the date of any election of a Borrowing Base Sub-Cap, the consolidated net loss of the
Borrower and its Subsidiaries for the twelve (12) months of reported results through the most recent Compliance Certificate, as defined according to GAAP, but excluding from net income any gains or losses attributable solely to accounting
changes adopted by Borrower to achieve consistency with the consensus reached on Issue 02-3 (Issues Involved in Accounting for Derivative Contracts Held for Trading Purposes and Contracts Involved in Energy Trading and Risk Management Activities) by
the Emerging Issues Task Force (EITF) of the Financial Accounting Standards Board reflected in the minutes of the October 25, 2002 meeting of the EITF. 
  

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 “Dollar Advance Cap” means a cap upon Revolving Loans under the Borrowing Base Line with
the following limits: 
 (a) $35,000,000 at such times as the Borrowing Base Sub-Cap is $100,000,000; and 
 (b) $70,000,000 at such times as the Borrowing Base Sub-Cap is $150,000,000; and 
 (c) $105,000,000 at such times as the Borrowing Base Sub-Cap is $200,000,000; and 
 (d) $140,000,000 at such times as the Borrowing Base Sub-Cap is $250,000,000; 
 (e) $175,000,000 at such times as the Borrowing Base Sub-Cap is $300,000,000; 
 (f) $210,000,000 at such times as the Borrowing Base Sub-Cap is $350,000,000; 
 (g) $240,000,000 at such times as the Borrowing Base Sub-Cap is $400,000,000; 
 (h) $280,000,000 at such times as the Borrowing Base Sub-Cap is $450,000,000; 
 (i) $315,000,000 at such times as the Borrowing Base Sub-Cap is $500,000,000; 
 (j) $350,000,000 at such times as the Borrowing Base Sub-Cap is $550,000,000; 
 (k) $385,000,000 at such times as the Borrowing Base Sub-Cap is $575,000,000; 
 (l) $390,000,000 at such times as the Borrowing Base Sub-Cap is $580,000,000 
 “Eligible Accounts” means, at the time of any determination thereof, each of the Borrower’s Accounts as to which
the following requirements have been fulfilled to the satisfaction of the Required Banks: 
 (a) Such Account (i) if for
an amount in excess of $1,000,000, is acceptable to the Required Banks in their sole discretion and either (x) is the 

  

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result of a sale to a Tier I or Tier II Account Party, or (y) is secured by letters of credit in form acceptable to the Required Banks in their sole
discretion and issued by banks approved by the Required Banks in their sole discretion, or (ii) if for an amount of $1,000,000 or less, such Account will be included as a Tier II Account unless such Account has been previously approved by the
Required Banks as a Tier I Account; 
 (b) Borrower has lawful and absolute title to such Account; 
 (c) Such Account is a valid, legally enforceable obligation of the Person who is obligated under such Account for goods actually
delivered or to be delivered to such Account Debtor in the ordinary course of the Borrower’s business; 
 (d) Such
Account shall have excluded therefrom any portion that is subject to any dispute, offset, counterclaim or other claim or defense on the part of the Account Debtor or to any claim on the part of the Account Debtor denying liability under such
Account; provided, however, that in the event that the portion that is subject to any such dispute, counterclaim or other claim or defense is secured with a Letter of Credit, such portion secured by the Letter of Credit shall not be
excluded; 
 (e) Such Account is not evidenced by any chattel paper, promissory note or other instrument; 
 (f) Such Account is subject to a fully perfected first priority security interest in favor of the Administrative Agent pursuant to the
Loan Documents, prior to the rights of, and enforceable as such against, any other Person, and such Account is not subject to any security interest or Lien in favor of any Person other than the Liens of the Banks pursuant to the Loan Documents;

 (g) Such Account shall have excluded therefrom any portion which is not payable in Dollars in the U.S.; 
 (h) Such Account has been due and payable for 15 days or less (or 30 days or less, if the Account Debtor is a Governmental Authority)
from the date of the invoice and no extension or indulgence has been granted extending the due date beyond a 15 day period (or 30 days, as the case may be), except if such Account by its terms provides for a 15 day payment period, then such Account
shall be eligible for up to 30 days from the date of invoice, or as otherwise approved by the Required Banks in writing; and 
 (i) No Account Debtor in respect of such Account is (i) incorporated in or primarily conducting business in any jurisdiction outside of the U.S., unless such Account Debtor and the Account is approved by the Required Banks and the

  

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Borrower is notified in writing by the Administrative Agent, or (ii) an Affiliate of the Borrower, other than Atmos Energy Corporation, provided, that
as long as Atmos Energy Corporation maintains an S&P rating of BBB or a Moody’s rating of Baa2 or better, and such Accounts would otherwise qualify as Eligible Accounts, Accounts of Atmos Energy Corporation (and its Subsidiaries and
Affiliates that have been approved by Agents as Tier I Account Parties) may be included as Tier I Accounts to the extent that such Accounts do not exceed 50% of Borrower’s total Accounts, provided, further, should Atmos Energy Corporation not
maintain such ratings, and such Accounts would otherwise qualify as Eligible Accounts, Accounts of Atmos Energy Corporation may be included, subject to the approval of the Required Banks, as Eligible Accounts as a Tier I Account or a Tier II
Account. 
 (j) The balance of such Account shall be the net of, in each case (i) any accounts payable owing to
the Account Debtor by the Borrower on such Account and (ii) after application thereof to any Eligible Exchange Receivables, Unbilled Eligible Accounts, and Realizable Unrealized Profits with such Account Debtor, other offsets against amounts
owed to such Account Debtor, whether in respect of unbilled purchases, out-of-the-money positions or unperformed contracts for purchase. 
 “Eligible Exchange Receivables” means all enforceable rights of the Borrower to receive Product in exchange for the sale or trade of Product previously delivered to the exchange debtor by the Borrower
valued at an independent posting and which (a) are evidenced by a written agreement enforceable against the exchange debtor thereof, (b) are current pursuant to the terms of the contract or invoice, (c) are subject to a perfected,
first Lien in favor of the Administrative Agent for the benefit of the Banks subject only to Permitted Liens, and no other Lien, charge, offset or claim, (d) are not the subject of a dispute between the exchange debtor and the Borrower,
(e) are valued at Platt’s spot market price or an independent posting acceptable to the Required Banks in their sole discretion, (f) if arising pursuant to contracts involving an amount in excess of $1,000,000, are contracts by
exchangers pre-approved by the Required Banks in their sole discretion, or contracts secured by letters of credit in form acceptable to the Required Banks in their sole discretion and issued by banks approved by the Required Banks in their sole
discretion, (g) have not been otherwise determined by the Required Banks in their sole discretion to be unacceptable to them, and (h) are the net of, in each case (i) any payables owing to such exchange debtor by the Borrower
and (ii) after application thereof to any Eligible Accounts, Unbilled Eligible Accounts, and Realizable Unrealized Profits with such Account Debtor, other offsets against amounts owed to such exchange debtor, whether in respect of unbilled
purchases, out-of-the-money positions or unperformed contracts for purchase. The Product and Account relating to or creating any Eligible Exchange Receivable shall not be simultaneously included 

  

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in any other availability calculation, including, without limitation, Undelivered Product Value, Eligible Inventory or Eligible Accounts. 
 “Expiration Date” means the earliest to occur of: 
 (a) March 31, 2007; or 
 (b) the date demand for payment is made by the Administrative Agent; or 
 (c) the date an
Event of Default occurs. 
 “Maturity Date” means June 30, 2007. 
 “Tier I Account Party” means an Account Debtor that is approved by the Required Banks in their sole discretion as a Tier
I Account Party. 
 “Tier II Account Party” means any Account Debtor that is approved by the Required Banks
in their sole discretion as a Tier II Account Party. 
 3. Amendment to Section 1.01 of the Credit Agreement. Section 1.01
of the Credit Agreement is hereby further amended by deleting the reference to “UFJ Bank Limited, New York Branch” in the definition of “Banks” in such Section 1.01 and substituting in lieu thereof “The Bank of
Tokyo-Mitsubishi UFJ, Ltd. (as successor by merger to UFJ Bank Limited, New York Branch)”. 
 4. Amendment to Section 3.01 of
the Credit Agreement. Section 3.01(b) is hereby amended by deleting the lead-in language appearing in such Section 3.01(b) beginning with “Each Issuing Bank” and ending with “any Letter of Credit if:” in its
entirety and substituting in lieu thereof the following: 
 “Each Issuing Bank is under no obligation to consider the
Issuance of or to Issue any Letter of Credit unless all Banks shall have consented (deemed or explicit) to the Issuance of such Letter of Credit in their sole discretion; provided that with respect to Section 3.01(b)(iii), no Issuing
Bank shall Issue any Letter of Credit that fails to comply with the expiry date requirements of Section 3.01(b)(iii) without the prior, explicit consent of each Bank, and with respect to the other provisions of this Section 3.01(b), each
Issuing Bank is under no obligation to Issue any Letter of Credit if:” 
 5. Amendment to Section 3.02 of the Credit
Agreement. Section 3.02(a)(iv) is hereby amended by deleting such subsection in its entirety and substituting in lieu thereof the following: 
  

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 “(iv) the expiry date of the Letter of Credit, which date shall not, without the
prior, explicit consent of each Bank, be later than the earlier to occur of (A) 90 days after the proposed date of Issuance of such Letter of Credit or (B) the Maturity Date;” 
 6. Amendment to Section 8.13 of the Credit Agreement. Section 8.13 is hereby amended by deleting such subsection in its entirety and
substituting in lieu thereof the following: 
 “Change of Management. Borrower shall not permit any Change of
Management. For purposes of this Section 8.13, “Change of Management” shall mean that within any 90-day period no Significant Change shall occur without approval from the Agents. For purposes of this Section 8.13,
“Significant Change” shall mean that two or more of the Key Individuals are no longer in roles comparable or greater than their existing roles at the start of the 90-day period. For purposes of this Section 8.13, “Key
Individuals” shall mean (i) Mark Johnson, in the role of President, C. Richard Alford, in the role of Senior Vice President-Finance and Administration, and Marc Tronzo, in the role of Senior Vice President-Trading.” 
 7. Amendment to Schedule 2.01 of the Credit Agreement. Schedule 2.01 of the Credit Agreement is hereby amended by deleting the reference
to “UFJ Bank Limited, New York Branch” under the column entitled “Banks” in Section II of such Schedule 2.01 and substituting in lieu thereof “The Bank of Tokyo-Mitsubishi UFJ, Ltd. (as successor by merger to UFJ Bank
Limited, New York Branch)”. 
 8. Amendment to Schedule 11.02 of the Credit Agreement. Schedule 11.02 of the Credit
Agreement is hereby amended by deleting such schedule in its entirety and substituting in lieu thereof Schedule 11.02 as appended hereto as Exhibit A. 
 9. Representations. To induce the Administrative Agent and the Banks to enter into this Amendment, the Borrower ratifies and confirms each representation and warranty set forth in the Credit Agreement as if
such representations and warranties were made on even date herewith, and further represents and warrants that (a) no material adverse change has occurred in the financial condition or business prospects of the Borrower since the date of the
last financial statements delivered to the Administrative Agent and the Banks, (b) no Default or Event of Default has occurred and is continuing, and (c) the Borrower is fully authorized to enter into this Amendment. THE BORROWER
ACKNOWLEDGES THAT THE CREDIT AGREEMENT PROVIDES FOR A CREDIT FACILITY THAT IS COMPLETELY OPTIONAL ON THE PART OF THE BANKS AND THAT THE BANKS HAVE ABSOLUTELY NO DUTY OR OBLIGATION TO ADVANCE ANY REVOLVING LOAN OR TO ISSUE ANY LETTER OF CREDIT.
BORROWER REPRESENTS AND WARRANTS TO THE BANKS THAT BORROWER IS 

  

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AWARE OF THE RISKS ASSOCIATED WITH CONDUCTING BUSINESS UTILIZING AN UNCOMMITTED FACILITY. 
 10. Conditions Precedent. This Amendment shall become effective on the first date (the “Effective Date”) on which each of the
following conditions precedent shall have been satisfied: 
 (a) Fees and Expenses. The Agents and the Banks shall
have received payment of all fees and expenses owed to them by the Borrower as of the Effective Date; 
 (b) Delivered
Documents. On the Effective Date, the Administrative Agent shall have received executed originals of: 
 (i) this
Amendment, executed by a duly authorized officer of each of the Borrower and the Banks; 
 (ii) the Acknowledgement and
Consent set forth in Exhibit A hereto, each executed by a duly authorized officer of the party named therein, consenting to this Amendment and affirming the Loan Documents specified therein; 
 (iii) a legal opinion of counsel to the Borrower and counsel to Guarantor each addressed to the Administrative Agent and the Banks, in
form and substance acceptable to the Administrative Agent and the Banks; 
 (iv) copies of the resolutions of the members of
the Borrower authorizing the amendments and transactions contemplated hereby, certified as of the Effective Date by the Secretary of the Borrower, and certifying the names and true signatures of the officers of the Borrower authorized to execute,
deliver and perform, as applicable, this Amendment and all other documents to be delivered by the Borrower hereunder; and 
 (v) such other documents or certificates as the Administrative Agent or counsel to the Administrative Agent may reasonably request. 
 11. Miscellaneous. 
 (a) Limited Effect. Except as expressly consented to hereby, the Credit Agreement and the other
Loan Documents shall remain in full force and effect in accordance with their respective terms, without any consent, amendment, waiver or modification of any provision thereof; provided, however, that upon the Effective Date, all
references herein and therein to the “Loan Documents” shall be deemed to include, in any event, the Amendment to the Guaranty, dated as of October 1, 2003, the First Amendment to Subordination Agreement, dated as of February 18,
2004, Amendment No. 1 to the Security Agreement and Reaffirmation dated March 30, 2005, the First Amendment, dated November 28, 2005, to the Uncommitted Second Amended and 

  

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Restated Credit Agreement and this Amendment, and all other documents delivered to the Administrative Agent or any Bank in connection therewith. Each
reference to the Credit Agreement in any of the Loan Documents shall be deemed to be a reference to the Credit Agreement as amended hereby. 
 (b) Severability. In case any of the provisions of this Amendment shall for any reason be held to be invalid, illegal, or unenforceable, such invalidity, illegality, or unenforceability shall not affect any other provision hereof,
and this Amendment shall be construed as if such invalid, illegal, or unenforceable provision had never been contained herein. 
 (c)
Execution in Counterparts. This Amendment may be executed in any number of counterparts, all of which taken together shall constitute one and the same instrument, and any party hereto may execute this Amendment by signing one or more
counterparts. Delivery of an executed counterpart of a signature page to this Amendment by facsimile or telecopier shall be effective as delivery of an originally executed counterpart of this Amendment. 
 (d) GOVERNING LAW. THIS AMENDMENT SHALL BE GOVERNED BY, AND CONSTRUED AND INTERPRETED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW
YORK; PROVIDED, HOWEVER, THAT THE ADMINISTRATIVE AGENT, THE BANKS AND ALL AGENT-RELATED PERSONS SHALL RETAIN ALL RIGHTS UNDER FEDERAL LAW. 
 (e) Rights of Third Parties. All provisions herein are imposed solely and exclusively for the benefit of the Borrower, Administrative Agent, the Banks, Agent-Related Persons, and their permitted successors and
assigns, and no other Person shall be a direct or indirect legal beneficiary of, or have any direct or indirect cause of action or claim in connection with this Amendment or any of the other Loan Documents. 
 (f) COMPLETE AGREEMENT. THIS WRITTEN AMENDMENT AND THE OTHER WRITTEN AGREEMENTS ENTERED INTO AMONG THE PARTIES REPRESENT THE FINAL AGREEMENT
AMONG THE PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS AMONG THE PARTIES. 
 [SIGNATURES FOLLOW] 
  

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 IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed and delivered by
their proper and duly authorized officers as of the day and year first above written. 
  

			
	 BORROWER

	
	 ATMOS ENERGY MARKETING, LLC
(formerly known as Woodward Marketing, L.L.C.), a Delaware limited liability
company

		
	By:	 	 /s/ RONALD BAHR

		 	Name: Ronald Bahr
		 	Title: Vice President
	
	 GUARANTOR

	
	ATMOS ENERGY HOLDINGS, INC.
		
	By:	 	 /s/ LAURIE M. SHERWOOD

		 	Name: Laurie M. Sherwood
		 	Title: Vice President & Treasurer

			
	 FORTIS CAPITAL CORP.,
a Connecticut corporation, as Joint Lead Arranger and Joint Bookrunner, Administrative Agent,
Collateral Agent, Issuing Bank, and a Bank

		
	By:	 	 /s/ IRENE C. RUMMEL

		 	Name: Irene C. Rummel
		 	Title: Senior Vice President
		
	By:	 	 /s/ LEONARD RUSSO

		 	Name: Leonard Russo
		 	Title: Director

			
	 BNP PARIBAS,
a bank organized under the laws of France, as Joint Lead Arranger and Joint Bookrunner, Documentation
Agent, Issuing Bank and a Bank

		
	By:	 	 /s/ ZALI WIN

		 	Name: Zali Win
		 	Title: Managing Director
		
	By:	 	 /s/ RICHARD J. WERNLI

		 	Name: Richard J. Wernli
		 	Title: Director

			
	 SOCIÉTÉ GÉNÉRALE,
as Syndication Agent and as a Bank

		
	By:	 	 /s/ BARBARA PAULSEN

		 	Name: Barbara Paulsen
		 	Title: Director
		
	By:	 	 /s/ CHUNG-TAEK OH

		 	Name: Chung-Taek Oh
		 	Title: Associate

			
	 NATEXIS BANQUES POPULAIRES,
as a Bank

		
	By:	 	 /s/ DAVID PERSHAD

		 	Name: David Pershad
		 	Title: Vice President
		
	By:	 	 /s/ VINCENT LAURAS

		 	Name: Vincent Lauras
		 	Title: Managing Director

			
	 RZB FINANCE LLC,
as a Bank

		
	By:	 	 /s/ HERMINE KIROLOS

		 	Name: Hermine Kirolos
		 	Title: Group Vice President
		
	By:	 	 /s/ GRISELDA ALVIZO

		 	Name: Griselda Alvizo
		 	Title: Vice President

			
	THE BANK OF TOKYO-MITSUBISHI UFJ, LTD., as a Bank
		
	By:	 	 /s/ TAKESHI TAKAHASHI

		 	Name: Takeshi Takahashi
		 	Title: Senior Vice President & Group Head

			
	 BROWN BROTHERS HARRIMAN & CO., as a Bank

		
	By:	 	 /s/ JOHN C. SANTOS, JR.

		 	Name: John C. Santos, Jr.
		 	Title: Managing Director

			
	 THE ROYAL BANK OF SCOTLAND plc, as a Bank

		
	By:	 	 /s/ MATTHEW MAIN

		 	Name: Matthew Main
		 	Title: Managing Director

 SCHEDULE 11.02 
 LENDING OFFICES AND ADDRESSES FOR NOTICES 
 FORTIS CAPITAL CORP., 

As Administrative Agent and Collateral Agent 
 15455 N. Dallas Parkway 
 Suite 1400 
 Addison, TX 75001 
 Telephone: (214) 953-9313 
 Facsimile: (214) 969-9332 
 FORTIS CAPITAL CORP., 
 As Issuing Bank and a Bank 
 15455 N. Dallas Parkway 
 Suite 1400 
 Addison, TX 75001 
 Attention: Marla Jennings 
 Telephone: (214) 953-9313 
 Facsimile: (214) 969-9332 
 BNP PARIBAS 
 As Documentation Agent 
 787 Seventh Avenue 
 New York, New York 10019 
 Attention: Ed Chin 
 Telephone: (212) 841-2020 
 Facsimile: (212) 841-2536 
 SOCIÉTÉ GÉNÉRALE, 
 As Syndication Agent and as a Bank 
 1221 Avenue of the Americas 
 New York, New York 10020 
 Attention: Barbara Paulsen 
 Telephone: (212) 278-6496 
 Facsimile: (212) 278-7417 
 NATEXIS BANQUES POPULAIRES 
 As a Bank 
 1251 Avenue of the Americas, 34th Floor 
 New York, New York 10020

 Attention: David Pershad 
 Telephone: (212) 872-5015 
 Facsimile: (212) 354-9095 

 RZB FINANCE LLC  
 As a Bank 
 1133 Avenue of the Americas 
 New York, New York 10036 
 Attention: Hermine Kirolos 
 Telephone: (212) 845-4114 
 Facsimile: (212) 944-6389 
 THE BANK OF TOKYO-MITSUBISHI UFJ, LTD. 
 As a Bank 
 The Bank of Tokyo-Mitsubishi UFJ, Ltd., 
 1251 Avenue of the Americas 
 New York, New York 10020-1104 
 Attention: Shigeru Shimizu 
 Telephone: (212) 782-5565 
 Facsimile: (212) 782-6442 
 with a copy to: 
 The Bank of Tokyo-Mitsubishi UFJ, Ltd., 
 1100 Louisiana Street, 
 Suite 2800 
 Houston, Texas 77002 
 Attention: Lad Perenyi 
 Telephone: (713) 655-3817 
 Facsimile: (713) 658-0116 
 BROWN BROTHERS HARRIMAN & Co. 
 As a Bank 
 140 Broadway 
 New York, New York 10005 
 Attention: Paul Feldman 
 Telephone: (212) 493-7732 
 Facsimile: (212) 493-8998 

 THE ROYAL BANK OF SCOTLAND plc 
 As a Bank 
 101 Park Avenue, 6th Floor 
 New York, New York 10178 
 Attention: Alisa Williams 
 Telephone: (212) 401-3200 
 With copies to: 
 600 Travis St, Suite 6500 
 Houston, Texas 77002 
 Attention: Matthew Main 
 Telephone: (713) 221-2441 
 Facsimile: (713) 221-2430 

 EXHIBIT A TO 
 SECOND AMENDMENT 
 ACKNOWLEDGEMENT AND CONSENT 
 Reference is made to the SECOND AMENDMENT, dated as of March 31, 2006 (the “Second Amendment”), to the SECOND AMENDED AND RESTATED
CREDIT AGREEMENT, dated as of March 30, 2005 (as amended by the First Amendment dated November 28, 2005, the “First Amendment”, and as further amended, supplemented or otherwise modified from time to time, the “Credit
Agreement”), among ATMOS ENERGY MARKETING, LLC, a Delaware limited liability company (the “AEM”), FORTIS CAPITAL CORP., a Connecticut corporation (“Fortis”), as a Bank, as an Issuing Bank, and as
Administrative Agent for the Banks (in such capacity, the “Administrative Agent”), as Collateral Agent, as a Joint Lead Arranger and as a Joint Bookrunner, BNP PARIBAS, a bank organized under the laws of France (“BNP
Paribas”), as a Bank, as an Issuing Bank, as a Joint Lead Arranger, as a Joint Bookrunner and as Documentation Agent, SOCIÉTÉ GÉNÉRALE, as Syndication Agent and as a Bank (together with the Administrative Agent,
the “Agents”), and each other financial institution that may become a party thereto (collectively the “Banks”), (ii) that certain SECURITY AGREEMENT, dated as of December 1, 2001 (as amended by AMENDMENT NO. 1 TO
THE SECURITY AGREEMENT, dated as of March 30, 2005 and as further amended, restated, supplemented or otherwise modified in writing from time to time, the “Security Agreement”) executed by AEM as grantor (the
“Grantor”) and the Collateral Agent, (iii) that certain GUARANTY, dated March 30, 2005 (as further amended, restated, supplemented or otherwise modified in writing from time to time, the “AEH Guaranty”) executed for
the ratable benefit of the Banks by Atmos Energy Holdings, Inc. (“AEH”) as guarantor (the “Guarantor”), (iv) that certain ATMOS SUPPORT AGREEMENT, dated March 30, 2005 (as further amended, restated, supplemented or
otherwise modified in writing from time to time, the “Atmos Support Agreement”) executed by Atmos Energy Corporation, a Texas and Virginia corporation (“Atmos”) as support sponsor (the “Support
Provider”), and (v) that certain SUBORDINATION AGREEMENT dated as of March 30, 2005 (as further amended, restated, supplemented or otherwise modified in writing from time to time, the “Subordination Agreement”) by and
between Fortis and AEH (the “Subordinated Creditor,” together with the Security Agreement, the AEH Guaranty and the Atmos Support Agreement, collectively, the “Security Documents” and individually, a
“Security Document”) and acknowledged by the Borrower. Unless otherwise defined herein, capitalized terms used herein and defined in the Credit Agreement are used herein as therein defined. 
 Each of the Grantor, the Guarantor, the Support Provider and the Subordinated Creditor hereby: 
 (a) acknowledges that the Borrower has requested and the Second Amendment will effect an extension of the Termination Date until
March 31, 2007 and an extension of the Maturity Date until June 30, 2007; 

 (b) acknowledges that the Borrower has requested certain other amendments to the Credit
Agreement on the terms and subject to the conditions set forth in the Second Amendment; 
 (c) acknowledges that such
requests were in order and that the benefits of such extensions and other amendments pursuant to the Second Amendment will directly or indirectly accrue to such party; 
 (d) consents to the Second Amendment; 
 (e) confirms and agrees that its respective obligations under the applicable Security Documents shall continue in full force and effect and is hereby ratified and confirmed in all respects; 
 (f) acknowledges the receipt and sufficiency of such benefits and other good and valuable consideration to support its continuing
obligations under the applicable Security Documents, including as such obligations may be affected by the effectiveness of the Second Amendment; and 
 (g) with respect to the Guarantor, confirms and agrees that any reference in the recitals of the AEH Guaranty to “$250,000,000” shall be deemed to be a reference to “$580,000,000” consistent with
the Credit Amendment. 
 Each party hereto, in its capacity as grantor, guarantor, support provider and subordinated creditor, hereby
ratifies that certain Second Amendment to Credit Agreement. 
 [SIGNATURE PAGE FOLLOWS] 

 IN WITNESS WHEREOF, the parties hereto have caused this Acknowledgement and Consent to be duly executed
and delivered by their respective proper and duly authorized officers as of March __, 2006. 
  

			
	ATMOS ENERGY MARKETING, LLC
  as Grantor
		
	By:	 	  
	Title:	 	
	
	
	ATMOS ENERGY HOLDINGS, INC.,
  as Guarantor and
  as Subordinated Creditor
		
	By:	 	  
	Title:	 	
	
	
	ATMOS ENERGY CORPORATION,
  as Support Provider
	
		
	By:	 	  
	Title:	 	
		
	By:	 	  
	Title:Royalty Agreement, dated as of November 21, 2005

 Exhibit 10.11 
 Confidential treatment has been requested for portions of this exhibit. The copy filed herewith omits the information subject to the confidentiality request. Omissions are designated as [*]. A complete version of this exhibit has been filed
with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. 
 Execution Copy

 ROYALTY AGREEMENT 
 ROYALTY AGREEMENT, effective as of October 1, 2005, by and between AtriCure, Inc. (“AtriCure”) with offices at 6033 Schumacher Park Drive, West Chester, OH 45069, and Randall K. Wolf, M.D. (“Wolf”) with offices at
Department of Surgery, University of Cincinnati College of Medicine, ML 0558, Cincinnati, OH 45267-0558. 
 WITNESSETH

 WHEREAS, AtriCure is engaged in the business of, among other things, developing technologies that provide doctors alternative,
more expedient methods to ablate tissue during surgical procedures and treat the left atrial appendage in order to reduce the incidences of stroke; 
 WHEREAS, Wolf is the co-inventor of the Wolf Dissector (as defined below); 
 WHEREAS, through his working relationship with
AtriCure, Wolf has provided AtriCure with access to the Wolf Dissector to be used in AtriCure’s business; 
 WHEREAS, the parties desire
to enter into this Agreement to set forth the terms and conditions under which AtriCure will make royalty payments to Wolf with respect to such use of the Wolf Dissector. 
 NOW, THEREFORE, for good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, and in consideration of the mutual promises contained herein, AtriCure and Wolf hereby agree as
follows: 
 1. Royalties. AtriCure shall pay to Wolf royalties for AtriCure’s use of the Wolf Dissector, as well as for those
inventions, improvements or ideas contemplated in Section 2 below, at the royalty rates set forth in Schedule A hereto or at such other percentage rates as may be agreed to between AtriCure and Wolf (the “Royalties”). In no
event shall the Royalties be less than $50,000 per quarter during the term of this Agreement; however, in no event shall the Royalties in the aggregate exceed $2,000,000. The minimum fourth quarter 2005 Royalty of $50,000 shall be paid to Wolf in
the fourth quarter of 2005. Any further Royalty due Wolf for the fourth quarter of 2005 shall be paid no later than January 15, 2006. Thereafter, Royalties shall be paid quarterly within fifteen (15) days following the end of each quarter
during the term of this Agreement. 
 As used herein, the term “Wolf Dissector” shall mean the articulating, illuminating
disposable handpiece designed to perform a dissection or any evolution of such device, including, but not limited to, the integration of such device into the AtriCure bi-polar ablation system. 

 2. Inventions. Wolf agrees to provide AtriCure with any inventions, improvements or ideas made or
conceived by Wolf within the field of atrial fibrillation treatment, excluding (a) pharmacologic treatments for atrial fibrillation, (b) pharmacology for stroke prevention, (c) devices designed specifically for stroke prevention and
(d) fat pad isolation techniques developed for [*], during the term of this Agreement and for ninety (90) days after its termination. Wolf agrees that any such inventions or ideas shall be the sole property of AtriCure and Wolf shall
execute, acknowledge and deliver to AtriCure all such further documents and papers, including assignments, applications for patents and any and all other documents and papers as maybe reasonably requested by AtriCure to effectuate the provisions of
this Section 2 and to permit AtriCure to publish or protect said inventions, improvements and ideas by patent or otherwise in any and all countries and to vest title to said patents, inventions, improvements and ideas in AtriCure or its
nominees, their successors or assigns. Wolf shall render all such assistance as AtriCure may require in any patent office proceeding or litigation involving said inventions, improvements or ideas. 
 3. Confidential Information. Any “Confidential Information” acquired by Wolf from AtriCure or developed in the course of the
relationship established hereunder shall not be disclosed by Wolf to others or used Wolf for Wolf’s own benefit or the benefit of any third party without the prior written consent of AtriCure. “Confidential Information” includes: any
and all proprietary or confidential data, methods, techniques, processes, formulas, designs, drawings, models, trade secrets, inventions, ideas, know-how, technical information, business records, technical data, test results, financial data or
information, marketing data or plans, customer information, pricing information, product specifications, and any and all information of any nature whatsoever embodied or included in any of the foregoing, in whatever medium recorded or contained; but
shall not include: (a) information which is or becomes, through no fault of Wolf, generally known to the public; or (b) information received by Wolf on a non-confidential basis from a source other than AtriCure, provided that Wolf has no
reason to believe that such source is or was under a duty of confidentiality to AtriCure. Upon termination of this Agreement, Wolf will return to AtriCure all records, data, notes, reports and other documents or property containing Confidential
Information furnished by AtriCure or developed pursuant to the relationship established hereunder and all copies thereof in any medium. 
 4.
Insider Information. Wolf agrees that as a result of the relationship established hereunder with AtriCure, Wolf may periodically possess Confidential Information that is considered to be “material” and “non-public”
information. The term “material” is defined to be information that a reasonable investor would consider important in making an informed investment decision. The term “non-public” means not made generally known by press release,
conference call open to the public, or in a filing with the Securities and Exchange Commission. Wolf also understands that AtriCure has adopted an insider trading policy that contains certain black-out periods for holders of material non-public
information. That black-out period starts on the first day of the last month of a fiscal quarter and ends two full days following the release of earnings or other material non-public financial information. Wolf agrees not to buy, sell, pledge or
otherwise trade, in AtriCure’s stock or options, or enter into any transaction having the same economic effect, while in possession of material non-public Confidential Information without pre-clearing such trades with AtriCure’s Chief
Financial Officer. Wolf understands that this Agreement further requires that Wolf not disclose such Confidential Information to anyone until it otherwise becomes publicly available. 
  

	[*]	Certain information on this page has been omitted and filed separately with the Securities and Exchange Commission. Confidential treatment has been requested with respect to the
omitted portions. 

  

 - 2 - 

 5. Exclusivity. Wolf agrees that during the term of this Agreement, Wolf will not consult in the
field of cardiac surgery for any other company or entity that manufactures, markets or sells or is researching or developing any device in the field of invasive atrial fibrillation treatment, excluding (a) pharmacologic treatments for atrial
fibrillation, (b) pharmacology for stroke prevention, (c) devices designed specifically for stroke prevention and (d) fat pad isolation techniques developed for [*]. 
 6. Term. This Agreement shall be effective as of the date hereof. This Agreement shall terminate on December 31, 2009 unless otherwise
terminated earlier by either party hereto. 
 7. Termination for Cause. 
 (a) AtriCure shall have the right at any time to terminate this Agreement immediately for cause, which shall include any of the following reasons:

 i. If Wolf shall violate the provisions of Sections 2, 3, 4 or 5 of this Agreement, or shall fail to comply with any other
material term or condition of this Agreement and Wolf does not cure such failure within thirty (30) days of written notice thereof from AtriCure; or 
 ii. If Wolf shall (x) be convicted of a felony, or (y) commit an act of dishonesty, fraud or embezzlement against AtriCure or any of its respective subsidiaries or affiliates. 
 (b) Wolf has the right at any time to terminate this Agreement immediately for cause if Wolf notifies AtriCure of any breach of AtriCure’s
obligations hereunder and AtriCure fails to cure such breach within thirty (30) days of written notice thereof. 
 (c) At the date of
termination, AtriCure shall have no further obligation to Wolf and Wolf shall have no further rights or obligations hereunder, except as set forth in Sections 2, 3 and 4 above, which provisions shall survive the termination of this Agreement, and
except for AtriCure’s obligation for unpaid Royalties that have accrued but have not been paid as of the date of termination. 
 8.
Default. In the event of a breach or threatened breach of this Agreement by either party hereto, each party acknowledges that the other party may not have adequate remedy at law and may be entitled to seek such injunctive relief as may be
available to restrain the other party from violating the provisions hereof. The prevailing party in any successful injunctive action shall be entitled to reimbursement from the other party (including, without limitation, reasonable attorneys’
fees) in connection with such action. Nothing herein shall prohibit either party from pursuing other remedies available with respect to such breach or threatened breach by the other party hereto, including the recovery of damages. 
 9. Severability. If one or more of the provisions of this Agreement are deemed invalid or unenforceable, such provision shall be ineffective and
the remaining provisions will continue in full force and effect. 
  

	[*]	Certain information on this page has been omitted and filed separately with the Securities and Exchange Commission. Confidential treatment has been requested with respect to the
omitted portions. 

  

 - 3 - 

 10. Supersession. This Agreement constitutes the entire understanding between AtriCure and Wolf
with respect to the subject matter recited herein. The terms and conditions set forth in this Agreement shall supersede any and all prior or contemporaneous written or oral agreements regarding the subject matter contained herein, including, without
limitation, that certain agreement, effective as of April 1, 2005, by and between AtriCure and Wolf. 
 11. Governing Law. This
Agreement shall be governed by, construed and enforced in accordance with the laws of the State of Ohio. 
 12. Amendment. This
Agreement may be changed, modified or amended by a written agreement of both parties hereto expressly referring to this Agreement and stating that it changes, modifies or amends this Agreement or portions thereof. 
 13. Notices. All communications under this Agreement shall be in writing and shall be delivered by hand or facsimile or mailed by overnight
courier or by registered or certified mail, postage prepaid to the parties at the addresses first listed above. Any notice so addressed shall be deemed to be given: if delivered by hand or facsimile, on the date of such delivery; if mailed by
courier, on the first business day following the date of such mailing; and if mailed by registered or certified mail, on the third business day after the date of such mailing, except in the case of common proof of late arrival of such notice.

 14. Waiver. Failure of any party at any time or times to require performance of any provision hereof shall in no manner affect the
right of such party at a later time to enforce the same, and no waiver of any nature, whether by conduct or otherwise, in any one or more instances, shall be deemed to be considered as a further or continuing waiver of any other provision of this
Agreement. 
 15. Counterparts. This Agreement may be executed in any of separate counterparts, each of which shall be deemed to be an
original, but which together shall constitute one and the same instrument. 
 16. Assignment. This Agreement may not be assigned by
AtriCure without the consent of Wolf except to an affiliate of AtriCure, provided that such affiliate assumes AtriCure’s obligations under this Agreement; provided, further, that if AtriCure merges or effects a
consolidation or share exchange with or into, or sells or otherwise transfers substantially all of its assets to, another business entity, AtriCure shall assign its rights and obligations hereunder to that business entity without the consent of
Wolf. 
  

 - 4 - 

 IN WITNESS WHEREOF, AtriCure and Wolf have caused this Agreement to be duly executed and delivered as of
this 21st day of November 2005. 
  

			
	ATRICURE, INC.
		
	By:	 	 /s/ David Drachman

	Name:	 	
	Title:	 	
	
	 /s/ Randall K. Wolf, M.D.

	Randall K. Wolf, M.D.

  

 - 5 - 

 Schedule A 
  

																		
	 	  	 Projected MIS
 Revenue
	 	 	 % Revenue from
 Dissector
 Projected
	 	 	 Projected
 Dissector
 Revenue
	 	 	Royalty Rate	 	 	 Projected
 Royalties Paid

	 Q4 2005
	  	$	[*]	 	 	[*]	%	 	$	[*]	 	 	15.0	%	 	$	[*]
	 2006
	  	$	[*]	 	 	[*]	%	 	$	[*]	 	 	10.5	%	 	$	[*]
	 2007
	  	$	[*]	 	 	[*]	%	 	$	[*]	 	 	4.0	%	 	$	[*]
	 2008
	  	$	[*]	 	 	[*]	%	 	$	[*]	 	 	2.5	%	 	$	[*]
	 2009
	  	$	[*]	 	 	[*]	%	 	$	[*]	 	 	1.5	%	 	$	[*]
		  	 	 	 	 			 	 	 	 	 			 	 	 
	 TOTAL
	  	$	[*]	 	 			 	$	[*]	 	 			 	$	[*]
		  	 	 	 	 			 	 	 	 	 			 	 	 
	 Royalty % of MIS
	  	 	[*]	%	 			 				 			 		
	 Royalty % of Dissector
	  				 			 	 	[*]	%	 			 		

	[*]	Certain information on this page has been omitted and filed separately with the Securities and Exchange Commission. Confidential treatment has been requested with respect to the
omitted portions. 

  

 - 6 -

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