In this schematic spectrum with a double bump at ϵb1 and ϵb2, we indicate for three different values of threshold energy ϵth,1, ϵth,2 and ϵth,3 the energies ϵ ≥ ϵth at which the observed photon flux can be maximum. These values are marked by circles for ϵth,1, diamonds for ϵth,2, and by squares for ϵth,3.
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