Fig. 1
Value of ΔΓ as a function of the redshift z. The black line is the theoretical break obtained with the Franceschini et al. (2008) model. The uncertainties due to the energy resolution of IACTs (dark gray), the different threshold energies (medium gray), and the systematic errors of 0.2 (light gray) are shown. The FSRQs and the BL Lacs with uncertain redshift are shown for illustration.
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