Fig. A.1.
Histograms of the derived background rates per area of all considered observations of EPIC-pn, MOS1, and MOS2 (from top to bottom). The orange line shows the Lorentz fit to the histogram and the grey dash-dotted line the Half Cauchy probability distribution, with the scale given in the right axis. The dashed vertical line marks the 87% probability cut used to discard observations as high-background contaminated. The red histogram shows the distribution of observations that have a HIGH_BACKGROUND flag in 3XMM-DR7 for comparison. Insets: zoom to the highest background values.
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