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Acknowledgements.

RP wishes to thanks the members of the Laboratory of Atmospheres, GSFC/NASA for fruitful discussions, mainly during the very stimulating TOMS Science Team Meetings. This work was partially financed by ANPCyT (Agencia Nacional de Promoción Científica y Tecnológica) of Argentina, FOMEC (Fondo para el Mejoramiento de la Enseñanza Universitaria, Ministerio de Educación de la Nación), Universidad Nacional de Rosario and CONICET. The technical computational assistance of Pablo Garcia at the Astronomical Observatory of Rosario, Argentina, is kindly appreciated.