Fig. 10
Histogram comparing the photon spectrum index (Γ) distribution for the γ-ray samples 2FHL (all sources), 2WHSP∗ (all γ-ray detected 2WHSPs down to TS = 10), and 2WHSP(new) (only the 150 new γ-ray detections). Note that this is a qualitative comparison given that Γ parameter for the 2FHL sample is measured in the 50 GeV−2 TeV energy band.
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