Fig. B.1

Corona approximated as an optically thin spherical region of radius Rc (violet region) centered at the compact object (point O), and emit hard X-rays. Inside the corona (ρ < Rc), the density of hard X-rays is uniform and isotropic. Outside (ρ > Rc), photons propagate radially outward. Gamma rays are injected on the disk axis with an inclination ψ toward the observer.
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