... IX

Tables 3 and 4 are only 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/cgi-bin/qcat?J/A+A/410/359

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...1,

Research Associate, Department of Astronomy, University of Maryland, College Park, MD 20742, USA.

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...1,

Current address: Centro de Física, IVIC, Caracas 1020A, Venezuela.

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