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Fig. 3.

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Distribution of pulsar phases of γ-ray candidate events detected with Fermi-LAT around the Crab Nebula. The distribution includes events with a reconstructed arrival direction that is within 1° of the Crab Nebula’s position. The shaded regions indicate the intervals for the Bridge emission (0.09 ≤ ϕ ≤ 0.22, not relevant here) and Off region (0.51 ≤ ϕ ≤ 0.89) derived with the QB algorithm. The grey shaded areas indicate regions found by the HOP algorithm, which identifies “watersheds” between local maxima (Meyer et al. 2019). There are shown here for illustration only.

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