Contour plot of the normalization factor Φ0(ψ,Emin) for γν = 1 and a declination of 38° (corresponding to Mrk 421). Contours represent the constant levels of Φ0(ψ,Emin): from 2.5 × 10-19 [GeV/cm2 s] to 3.25 × 10-19 [GeV/cm2 s] with step of 0.25, from center to the border, for a scale factor of E0 = 1017 eV. The optimal choice of ψ,Emin corresponding to the minimum of Φ0(ψ,Emin) marked by the blue cross.
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