Fig. 4

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Distributions of source (blue) and background (orange) extraction radii (upper panel) and distributions of source net counts and background counts in the 0.2–5 keV band (lower panel). The median values of the whole sample are marked with dotted vertical lines. The two-level shaded regions indicate the subsamples of the sources with source net counts ⩾10 and ⩾30, respectively.