Fig. 14.
HRX for all the XBC sample vs. FX in the 0.5−10 keV band. The symbol coding is the same as in Fig. 7. XBCs that have been classified as BZBs are plotted as empty black circles, while BZQs and QSOs as black triangles and diamonds, respectively. The solid black line represents a threshold in FX above which 68% of all XBCs have already been identified and only as BZBs.
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