On February 27, 2015, the Comisión Nacional de Hidrocarburos (CNH) published in the Federal Gazzette (or Diario Oficial de la Nación, DOF) the Call for Bidders No. CNH-R01C02/2015, the Bidding Guidelines and the Model Production Sharing Contract (PSC) for five mature contract areas located in shallow waters off the Gulf of Mexico coastlines of Veracruz, Tabasco and Campeche.