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Astron. Astrophys. 363, 863-868 (2000)

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Acknowledgements

We thank the referee, Thomas Boller, for useful comments. We acknowledge the BeppoSAX SDC team for providing pre-processed event files and for their constant support in data reduction. GM, GCP, FF and FN acknowledge financial support from ASI and MURST (grant COFIN 98-02-32).

This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.

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© European Southern Observatory (ESO) 2000

Online publication: December 5, 2000
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