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Astron. Astrophys. 361, 265-272 (2000) AcknowledgementsWe wish to thank the Swiss National Science Foundation (FNSRS) for the continuous support to this project. Support from Fundação para a Ciência e Tecnologia, Portugal, to N.C.S. in the form of a scholarship is gratefully acknowledged. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 2000 Online publication: September 5, 2000 ![]() |