Fig. 3
Energy spectrum of PKS 2155−304 obtained from the H.E.S.S. II mono analysis (2013 data, shown by blue circles with confidence band) in comparison with the contemporaneous Fermi-LAT data with an energy threshold of 0.1 GeV (red triangles and confidence band), 10 GeV (green band), and 50 GeV (purple band) and contemporaneous CT1–4 data (grey squares). In all cases the confidence bands represent the 1σ region. The right-hand y-axis shows the equivalent isotropic luminosity (not corrected for beaming or EBL absorption). The inset compares the H.E.S.S. confidence band with the Fermi-LAT catalogue data (3FGL, 1FHL and 2FHL, see Sect. 4.4.2).
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