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Astron. Astrophys. 337, 591-602 (1998) AcknowledgementsThis work is supported by the Grant agency of the Czech Republic (project no. 205-97-0700) and by Sandia National Laboratories. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: August 17, 1998 ![]() |