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Astron. Astrophys. 346, L37-L40 (1999) AcknowledgementsWe are grateful to Thomas Blöcker for many fruitful discussions. This work has been supported by the Deutsche Forschungsgemeinschaft through grants La 587/15-1 and 16-1. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1999 Online publication: June 17, 1999 ![]() |