Astron. Astrophys. 331, 519-523 (1998)

Acknowledgements

We thank Dr. G. Matt for helpful discussions, and Dr. D. Smith who provided us with the Ginga data. This research has made use of SAXDAS linearized and cleaned event files produced at the BeppoSAX Science Data Centre. G.M., G.G.C.P., M.C., A.C., and L.B. acknowledge financial support from the Italian Space Agency.

© European Southern Observatory (ESO) 1998

Online publication: February 16, 1998
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