I thank K.S. de Boer and the Heidelberg-Tübingen team for permission to use the G.O. and P.I. data on Magellanic Cloud star spectra for this study and for their great support. I thank K.S. de Boer for helpful comments on this work. When this paper was prepared, PR was supported by a grant from the DARA (now DLR) under code 50 QV 9701 3.
© European Southern Observatory (ESO) 2000
Online publication: July 13, 2000