Emergent spectra (black, solid line) for different relative luminosities of ℓ = 0.01, 0.1, 0.5 and 1.0 for compositions of the solar ratio of H/He with Z = 20 Z_⊙ (upper panel) and Z = 40 Z_⊙ (middle panel); and pure iron (bottom panel) for log g = 14.0 is shown. Best-fit diluted blackbody function (red, dashed line) is also shown together with a blackbody function where T_bb = T_eff (blue, dotted line). Vertical dashed lines correspond to the observed (3−20) × (1 + z) keV range where the fitting is performed.