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Fig. 2
Difference, ΔΓ, between the measured VHE and Fermi photon indices (or conventional limit 1.5) as a function of the redshift. Red inverted triangles denote the ΓVHE − ΓFer, and black triangles denote the ΓVHE − 1.5. The red dash line show the fitting of ΓVHE − ΓFer.
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