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Astron. Astrophys. 339, 610-614 (1998) AcknowledgementsWe thank Serge Koutchmy and the referee for their comments. This work was subsidized in part by NATO through the Cooperative Research Grant 940291. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: October 21, 1998 ![]() |