Dear Matias, Thank you very much for your suggestion. I will try it. With regards, Prasamsa Singh On Wed, 28 Feb 2007 00:39:59 -0600 "J. Matias Mendez Perez" <matias at TROPOSFERA.ATMOSFCU.UNAM.MX> wrote: > Matias --------- Prasamsa Singh Doctoral student, Hydrospheric & Atmospheric Research Center (HyARC) Nagoya University