Based on observations collected at the very large telescope (VLT), European Southern Observatory, Chile, under programme 71.B-0537.

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Tables A.1-A.3 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/448/155

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