Residual significance map for PKS 2155−304, in equatorial coordinates (J2000). Results derived with the 3D likelihood analysis with Gammapy are displayed. We apply a convolution with a top-hat kernel of 0.1° radius to reduce statistical fluctuations. The position of PKS 2155−304 is indicated by the “×”. Upper panel: distribution of significance values, together with the fit of a normal distribution (red line).
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