Emerging spectrum of a compact object through an outflowing plasma. The incident spectrum inside the outflowing plasma is taken to be ﹩\varphi _{\mathrm{Comp}\,}( E) \propto E^{-\alpha }\mathrm{exp}\,( -E/ E_{*}) ﹩ (see eq. [9]) where energy index ﹩\alpha =0.5﹩ and high‐energy cutoff is at ﹩E=E_{*}=130﹩ keV. Outflow parameters are ﹩kT_{e}=0.1﹩ keV and ﹩\tau =4﹩. The photon emerging spectrum (crosses) is compared to the incident spectrum (dashed line) and the analytical downscattering spectrum (solid line; see eq. [A8]). For ﹩\beta =0.1﹩, 0.3, 0.5, and 0.8, the best‐fit parameters are ﹩b=0.06﹩, 0.10, 0.18, and 0.38, respectively. The low‐energy downscattering bump effect is not seen in the emergent spectra.