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Astron. Astrophys. 349, L5-L8 (1999) AcknowledgementsWe are grateful to W.-R. Hamann and L. Koesterke for many useful discussions. This work has been supported by the Deutsche Forschungsgemeinschaft through grant La 587/16. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1999 Online publication: August 25, 1999 ![]() |