Two examples of simulated spectra emitted by the warm corona for τ_cor = 20 and two different values of χ: 1.35 (red) and 0.753 (blue). The best fit values for the photon index and high-energy cut-off when the spectra are fitted with a high-energy exponential cut-off power law are indicated in the figure. The simulation corresponding to the red spectrum is represented by the “x” in Fig. 3 and is in the parameter space which agrees with the spectral shape of the soft X-ray excess. On the contrary, the simulation corresponding to the blue spectrum is represented by the “+” in Fig. 3 and has a much steeper spectrum compared to the usual values of the soft X-ray excess. We also report in black the corresponding black-body spectrum emitted by the disk at the bottom of the warm corona.