Notes. The best-fitting spectral parameters. All errors are quoted at the 90% confidence level (Δχ² = 2.706). M_BH is in units of M_⊙. r_cor is in units of r_g = GM_BH/c², and log r_out (in the same units) is fixed at 5.0. The two upper lines give the black hole mass obtained from the fitting, the three lower lines are fits with the black hole mass fixed at values suggested by QPO (Gierlinski et al. 2008a). Other model parameters were frozen at the values favored by Middleton et al. (2011): kT_e = 0.195 keV, τ = 14.1, Γ = 2.33. The normalization of Fe II is in units of 10^-8, as in Table 1. Value of f_HST/SDSS is fitted as a constant, accounting for the SDSS and HST data sets coming from different epochs.