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Astron. Astrophys. 343, 325-332 (1999) AcknowledgementsWe thank for support from the grants GACR-202/99/0261 of the Grant Agency of the Czech Republic and GAUK-36/97 from the Grant Agency of the Charles University. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1999 Online publication: March 1, 1999 ![]() |