...$+43^\circ$[*]
Tables1and5areavailableatCDStocdsarc.u-strasbg.fr(130.79.128.5)orviahttp://cdsweb.u-strasbg.fr/Abstract.html
Figure4isonlyavailableinelectronicformathttp://www.edpsciences.org
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Copyright The European Southern Observatory (ESO)