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Astron. Astrophys. 329, L5-L8 (1998) AcknowledgementsWe thank Dr. R.H. Mendez for his comments on a first version of this paper as well as an anonymous referee for his criticisms and suggestions. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: November 24, 1997 ![]() |