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Tecpetrol Internacional S.L.U. -- Moody's changes to negative the outlook on Argentine Companies

Moody's Investors Service ("Moody's") has changed to negative from stable the outlook for several companies operating in Argentina, while all ratings were affirmed. Pampa Energía S.A.'s CFR and senior unsecured notes' ratings were affirmed at B2. The outlook was changed to negative from stable.