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Astron. Astrophys. 353, 465-472 (2000) AcknowledgementsWe warmly thank J.P. Veran and E. Gendron for useful discussions, F. Lacombe for his help on the data reduction and Z. Tsetanov for his precious contribution in deriving the HST composite image seen by the WFAS. We acknowledge as well precious comments from an anonymous referee. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 2000 Online publication: December 17, 1999 ![]() |