Based on observations collected at the Haute-Provence Observatory (France).

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Table 1 is also available, and Full Table 8 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/491/951

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