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Astron. Astrophys. 363, 526-536 (2000) AcknowledgementsThis research was supported by contracts Pôle d'Attraction Interuniversitaire P4/05 (SSTC, Belgium) and FRFC F6/15-OL-F63 (FNRS, Belgium).
© European Southern Observatory (ESO) 2000 Online publication: December 11, 2000 ![]() |