AMENDMENT NO. 1 TO JOINT FILING AGREEMENT

Exhibit 3

AMENDMENT NO. 1 TO JOINT FILING AGREEMENT

     In accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, AEI and each of the Xxxxxxx Entities (as such term is defined in the Statement on Schedule 13D originally filed with the Securities and Exchange Commission on October 5, 2009 (the “Original Statement”)) entered into a Joint Filing Agreement, dated October 2, 2009 (the “Joint Filing Agreement”) in connection with the Original Statement (including amendments thereto) relating to the 12,642,668 American Depositary Receipts, representing 63,213,340 Class “B” Shares, par value Ps.1, of Transportadora de Gas del Sur S.A. and this Joint Filing Agreement was included as an Exhibit to the Original Statement.

     AEI and the Xxxxxxx Entities hereby wish to amend the Joint Filing Agreement to provide for Xxxxxxx Emerging Markets Debt and Currency Fund (“AEMDC”) to be joined as an additional party to the Joint Filing Agreement and AEMDC hereby agrees to be joined as an additional party to the Joint Filing Agreement and be bound by each and all of the provisions thereof.

     This Amendment may be executed in any number of counterparts all of which taken together shall constitute one and the same instrument.

     In witness whereof, the undersigned hereby execute this Amendment this 8th day of October, 2009.

		AEI
		By:		/s/ Xxxxxxx X. Xxxx
		Name:		Xxxxxxx X. Xxxx
		Title:		EVP, General Counsel
		XXXXXXX EMERGING MARKETS DEBT AND CURRENCY FUND
		By: Northern Trust (Guernsey) Limited as custodian for and on behalf of Xxxxxxx Emerging Markets Debt and Currency Fund
		By:		/s/ Xxxx Xxxxxxx                   Xxxxxx Xxxxxx
		Name:		Xxxx Xxxxxxx                        Xxxxxx Xxxxxx
		Title:		Authorised Signatory            Authorised Signatory

		XXXXXXX INVESTMENT MANAGEMENT LIMITED
		By:		/s/ Xxxxx Xxxxxxx
		Name:		Xxxxx Xxxxxxx
		Title:		Head of Legal
		XXXXXXX GROUP PLC
		XXXXXXX INVESTMENTS (UK) LIMITED
		XXXXXXX MANAGEMENT COMPANY LIMITED
		XXXXXXX GLOBAL SPECIAL SITUATIONS FUND 2 LIMITED
		XXXXXXX GLOBAL SPECIAL SITUATIONS FUND 3 LIMITED PARTNERSHIP
		XXXXXXX GLOBAL SPECIAL SITUATIONS FUND 4 LIMITED PARTNERSHIP
		XXXXXXX GLOBAL SPECIAL SITUATIONS FUND 5 LIMITED PARTNERSHIP
		XXXXXXX EMERGING MARKETS LIQUID INVESTMENT PORTFOLIO
		XXXXXXX EMERGING MARKETS GLOBAL INVESTMENT PORTFOLIO LIMITED
		XXXXXXX GROWING MULTI STRATEGY FUND LIMITED
		XXXXXXX SICAV EMERGING MARKETS DEBT FUND
		EMDCD LTD.
		FCI LTD.
		XXXXXXX CAYMAN SPC NO. 3 LIMITED ON BEHALF OF AND FOR THE ACCOUNT OF AEI SEGREGATED PORTFOLIO
		By: Xxxxxxx Investment Management Limited
		By:		/s/ Xxxxx Xxxxxxx
		Name:		Xxxxx Xxxxxxx
		Title:		Head of Legal