Fig. 1
Log-log plot of the critical luminosity compactness 
as a function of the injected γ-ray photon energy ϵγ, when the δ-function approximation for the cross section σγγ was used for two values of the magnetic field strength: B = 40 G (solid line) and B = 4 G (dashed line). The values calculated by SK using only catastrophic losses are marked with crosses.
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