Based on observations obtained with the Danish 1.5-m telescope at the European Southern Observatory, La Silla, Chile.

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Tables 1 and 2 are also, and Table A1 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/386/187

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