Fig. A.1.

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Observed X-ray surface brightness profiles of FULLphot sample (left), CEN sample (middle) and isolated sample (right), without masking X-ray sources. The data points are the observed X-ray surface brightness profile, the colored bands are the estimated background by taking the random points (purple), the minimum X-ray surface brightness (blue) and the mean X-ray surface brightness within 2-3 Mpc (red).
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