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Astron. Astrophys. 331, 485-492 (1998) AcknowledgementsI gratefully thank B. Fuchs and R. Wielen for many helpful discussions and encouragement during the course of this work. The comments of the referee M. Gerin helped to improve the presentation of the model and the results. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: February 16, 1998 ![]() |