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174 Gerardo J. Aguirre-Dı ´az et al.

(CSIC) en Barcelona, Espan ˜a’’ during 2006 and 2007. We also appreciate the financial aid from
Posgrado de Ciencias de la Tierra of UNAM during 2006. Financial support for this work was
obtained from UNAM through PAPIIT research grants IN-120999, IN-115302, and IN-114606 to
Gerardo J. Aguirre-Dı ´az, and from CONACYT research grants 33084-T and P-46005 to Gerardo J.
Aguirre-Dı ´az.

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