Fig. 1
Left panel: significance skymap of the Perseus cluster above 150 GeV. The positions of NGC 1275 (white cross), which coincides with the cluster center, and the head-tail radio galaxy IC 310 (black cross) are marked. Right panel: significance skymap of the Perseus cluster region above 630 GeV. The central white circle marks the 0.15° region used to derive constraints (see main text for details). The quoted energy thresholds are obtained assuming a spectral index of 4 as observed in NGC 1275.
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