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Astron. Astrophys. 329, 769-775 (1998) AcknowledgementsThe authors are indebted to Prof. W. J. Baggaley for improving the language of the paper. The help of dr. A. Cellino is also appreciated. The second author's work has been supported by the grant No. 205/96/1197 of the Grant Agency of the Czech Republic. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: December 8, 1997 ![]() |