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Astron. Astrophys. 358, 276-286 (2000) AcknowledgementsMy sincere thanks to the Referees on this manuscript. Without their helpful advice to a newcomer to the field, the results would not have reached their present form. This study has been partly supported by the Swedish Research Council for Engineering Sciences. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 2000 Online publication: June 26, 2000 ![]() |