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Astron. Astrophys. 363, 1051-1054 (2000) AcknowledgementsThis research has made use of computational resources of the Computing Center of the Slovak Academy of Sciences. Use of CCP7 library software is gratefully acknowledged. We cordially thank the anonymous referee for valuable comments.
© European Southern Observatory (ESO) 2000 Online publication: December 5, 2000 ![]() |