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Astron. Astrophys. 334, L65-L68 (1998)

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Acknowledgements

We would like to thanks D. Dal Fiume, A.N. Parmar and L. Piro for their constant help and scientific support. This research has made use of data obtained through the High Energy Astrophysics Science Archive Research Center (HEASARC), provided by NASA's Goddard Space Flight Center. This work was partially supported through grants from the Agenzia Spaziale Italiana.

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© European Southern Observatory (ESO) 1998

Online publication: May 15, 1998

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