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Astron. Astrophys. 337, 815-818 (1998) AcknowledgementsWe thank the RXTE team and M. Takeshima in particular for providing the realtime archival data and software support. We thank an anonymous referee and M. Finger for some valuable suggestions. This research has made use of computer systems of the optical CCD astronomy programme of TIFR. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: August 27, 1998 ![]() |