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Astron. Astrophys. 329, 863-872 (1998) AcknowledgementsWe thank S. Paltani for precious help and advice on the use of PCA and we are very grateful to the anonymous referee for his detailed comments, which helped us strongly to improve this work. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: December 16, 1997 ![]() |