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Astron. Astrophys. 350, 423-433 (1999) AcknowledgementsR.R. thanks the Deutsche Forschungsgemeinschaft for support (project Ru 488/7). Matthias Ehle is acknowledged for valuable comments to improve the paper. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1999 Online publication: October 4, 1999 ![]() |