Timing properties of the outflow. The photon distribution over escape time ﹩\mathstrut{\cal P} ( t/ t_{\mathrm{fp}\,}) ﹩, where ﹩t_{\mathrm{fp}\,}=l/ c﹩ is a free path time. This simulation is made for the incident spectrum as a power law with exponential cutoff for ﹩kT_{e}=0.1﹩ keV, ﹩\tau =4﹩, and ﹩\beta =0.1﹩. It is worth noting that the index ﹩b=0.057﹩ of the exponential distribution ﹩\mathrm{exp}\,( -bt/ t_{\mathrm{fp}\,}) ﹩ (red line) is very close to the best‐fit parameter values ﹩0.06\pm 0.005﹩ for the energy spectrum. We find that in all cases the best‐fit parameter b obtained from the photon distribution over escape time is very close to b obtained from the best‐fit analytical spectrum.