Local spectra νF_ν versus photon energy E, from TITAN code, for different spin values at the i = 17.6°. The gray gradient of lines depicts outgoing spectra calculated at different radii, with the darkest line at r_in, and the lightest line at r_out. The colored lines show the simulation with maximum temperature, which is coherent with the dashed line in Fig. 2 and solid colored lines in Fig. 3. The parameters other than the spin and the viewing angle are set to be canonical values as depicted in Table 2.