Emergent spectra from the Monte Carlo simulations. The models plotted correspond to a fixed γ_min = 3.34 (v_⊥ = 0.52c) and optical depth τ = 0.1,0.25,0.5,0.75,1.0,1.25,1.5. The input source of photons follows a blackbody distribution with kT = 2.5 keV. The normalization of the input blackbody was chosen so that the hard component contributes about 5% of the 0.1−300 keV luminosity. In the energy range covered by current missions (< 300 keV) the hard tail shows no break.