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Fig. A.1.

image

Distribution of the square of the angle between the source position and event direction (left), and distribution of the reconstructed energy (right) for data (excess events) and MC simulations. The latter have been weighted such as to represent the power law fitted to the Fermi-LAT data with index Γ  =  4.1 and scaled by a factor η  =  0.84 (see text). The light blue histogram on the right panel is the corresponding distribution for the generated true energy, Etrue, for MC events passing the analysis cuts. This distribution has an average energy of 31 GeV and peaks at ∼20 GeV: ∼40% of events lie below the latter energy, 34% are in the 10–20 GeV range, and 6% have an energy below 10 GeV.

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