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Astron. Astrophys. 358, L41-L44 (2000) AcknowledgementsThis work was supported by the Russian Foundation for Basic Research (projects no. 96-15-96930 and 00-02-17251). We thank Marat Gilfanov and Alexey Vikhlinin for helpful comments and discussions. Authors are grateful to referee of this paper, Ed Fenimore, for useful remarks.
© European Southern Observatory (ESO) 2000 Online publication: June 8, 2000 ![]() |