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Astron. Astrophys. 325, 745-754 (1997) AcknowledgementsThis work is based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the AURA, Inc. for NASA under contract NSA5-26555. The research was supported by University of Michigan. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1997 Online publication: April 28, 1998 ![]() |