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Astron. Astrophys. 337, 17-24 (1998) AcknowledgementsWe thank M. Mignoli and D. Maccagni for having observed fields 61 and 62, and H.Böhringer for his help with the photometric catalogue. This research has made use of the NASA/IPAC Extragalactic Database. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: August 6, 1998 ![]() |