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Astron. Astrophys. 333, 452-458 (1998) AcknowledgementsWe acknowledge support for this work from the Deutsche Forschungsgemeinschaft under SFB 328 (A.M.) and DFG Ma 1545/2-1 (F.R.). ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: April 20, 1998 ![]() |