Fraction of the final energy gained by power-law photons with E_∞ > 10 keV in the most energetic scattering (left), and the energy gain of photons in the power-law tail with E_∞ > 10 keV as a function of the radial coordinate of the scattering (right). Only photons reaching an observer at an inclination of 33﹩\mathop{.}\limits^{\unicode{x000b0}}﹩6 are shown. The ergosphere extends up to 2r_g.