Distribution of the source fluxes in the 0.2–4.5 keV (XID) band. The diagrams show the number of sources at each flux bin, plotted versus the flux, using logarithmic scales. The inlay shows the number of sources for XID fluxes lower than 5 × 10-15 erg cm-2 s-1, on linear scales. The blue histogram gives the distribution of sources classified or identified as either SSSs, SNRs, XRBs or GlCs.
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