Based on observations carried out with the Strömgren Automatic Telescope (SAT) at ESO, La Silla, Chile.

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When the individual analyses are finished, Tables 12-20 will gradually be made 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/374/980

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