Fig. 5

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Number of point sources as a function of detection significance in ARTSS12 in the 4–12 keV band (thick solid line). The dashed vertical line indicates the adopted threshold of S/N = 4.82, which corresponds to the expected 10% fraction of spurious sources. The thin solid line shows the expected number of spurious sources as a function of the detection significance. The inset shows a zoom-in near the detection threshold.
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