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Fig. D.1

image

Slopes of N(γ) related to the underlying Q(γ). The scenario in the top panel is suggested for all blazars in which the observed photon index is significantly greater than ~ 1.5. It represents a N(γ) in which electrons are injected down to a γb close to the minimum energy, so that we would be observing the emission related to the N(γ) ∝ γ−(s2+1) region. The bottom panel is suggested to explain all blazars in which the observed photon index is significantly smaller than ~ 1.5, being related to N(γ) ∝ γs1, plus a possible additional hardening due to photon starving. Then, depending on γmin and γcool (multiplied by Γ), spectral breaks can be detected or not within the observing band.

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