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Astron. Astrophys. 331, 524-534 (1998) AcknowledgementsWe thank M. Samland and R. Spurzem for valuable discussions. J.K. thanks the Deutsche Forschungsgemeinschaft for financial support (project He 1487/13-1) and the Observatoire de Strasbourg for its generous hospitality. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: February 16, 1998 ![]() |