...García-Vargas1
Present address: GTC Project, Instituto de Astrofísica de Canarias, Vía Láctea S/N, 38200 la Laguna (Tenerife), Spain.
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...Mollá3
Present address: Departement de Physique, Université de Laval, Chemin Sainte Foy, Quebec G1K 7P4, Canada.
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...discussed
Tables 1 to 10 are only available in electronic form at CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html
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Copyright The European Southern Observatory (ESO)