...$\vec{Newton}$

Based on observations obtained with XMM-Newton , an ESA science mission with instruments and contributions directly funded by ESA Member States and the USA (NASA).

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...ROSAT /PSPC

This is an extension of the previously published catalog of 396 sources (Supper et al. 1997, Su97).

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... count rate

Some of the sufficiently bright sources were excluded from our analysis because of the confusion with nearby sources or because they were too close to the chip edge.

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