Model spectra with different EBL absorption optical depths. It is indicated that, dependent of the EBL absorption optical depth, the photon spectra with the photon energy between 0.1 TeV and 10 TeV could be described by a relation dNγ(Eγ)/d with a small photon spectral index 1.5 < Γ < 2.5, and even flatter in a higher energy band.
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