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Astron. Astrophys. 358, 373-377 (2000) AcknowledgementsWe wish to thank E. Landi Degl'Innocenti for fruitful discussions. Thanks are also due to the referee for helpful comments. The computations were performed on the work stations of the computer center of Observatoire de Paris.
© European Southern Observatory (ESO) 2000 Online publication: June 26, 2000 ![]() |