Top panel: critical compactness ℓγ,cr as a function of the minimum energy of the γ-ray spectrum ϵmin for Γ = 1.6 (solid line) and Γ = 2 (dashed line). The numerically derived values for the two cases are shown with circles and triangles, respectively. Bottom panel: same as in top panel except for different photon indices, which are marked on the plot. Other parameters used are: ϵmax = 2.3 × 105 (in mec2 units), B = 40 G, and R = 3 × 1016 cm. In both panels the grey area denotes the region where ϵmin > ϵq; see text for the definition of ϵq.
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