Model results for the relation between the photon index Γ and the observation angle θ for τ∥ = 2.5 and various values of R0. The two horizontal dotted lines place bounds on the range 2.3 < Γ < 2.6 and the two vertical dotted lines place bounds on the range 45 ± 15°. High-inclination systems are on the left and low-inclination ones are on the right.
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