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Astron. Astrophys. 336, L33-L36 (1998) AcknowledgementsThe Deutsche Studienstiftung and the Deutsche Forschungsgemeinschaft (Schm 885/5-1 & Ko 738/7-1) are gratefully acknowledged for financial support. We thank Susanne Friedrich for the careful reading of the manuscript and the referee Richard Allen for valuable comments.
© European Southern Observatory (ESO) 1998 Online publication: July 20, 1998 ![]() |