Astron. Astrophys. 345, L1-L4 (1999)

Acknowledgements

The authors thank R. Gualandi and S. Bernabei for their help during observations. The authors also thank F. Haberl the comment of which helped to improve this paper. This work was partially supported through ASI grants.

© European Southern Observatory (ESO) 1999

Online publication: April 12, 1999
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