Fig. 4
Left panel: a simulated XRT image with five labeled sources, three AGNs (sources 0, 1, and 2) and two clusters (sources 3 and 4). Right panel: the cumulative net count profile for the sources shown in the upper panel. The KS-test results are given for each source in the inset frame. The two clusters are clearly identified as extended (with a profile above the PSF and a high KS-test probability) and the three AGNs as unresolved sources (with a profile consistent with that of the PSF and a low KS-test probability).
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