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Astron. Astrophys. 331, 581-595 (1998)
Footnotes1. Tables 2 and 4 are also available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html © European Southern Observatory (ESO) 1998 Online publication: February 16, 1998 ![]() |