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Astron. Astrophys. 338, L13-L16 (1998) AcknowledgementsI thank M. Pakull and E. Janot-Pacheco for discussions and comments on an early version of this paper and I am grateful to the referee for suggesting several valuable improvements. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: September 8, 1998 ![]() |