Fig. 1.
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Normalized histograms of the galactic latitude b (top) and the X-ray to r-band flux ratio log10(FX/Fr) (bottom) for the sources of the reference sample. The four classes, AGN, star, XRB, and CV, are shown. The green spikes present in the first panel correspond to latitudes of galaxies in which many XRBs were found in the literature (e.g., M31, NGC5457, and NGC1399).
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