Ratio of virial masses of S11 and this work as a function of redshift. The color-coded two-dimensional histogram refers to ratios in which the MBH virial masses have been obtained directly from the QSFIT results from Eq. (2) (left panel) and Eq. (3) (right panel). The redshift is binned with a step of 0.01, while the S11-QSFIT mass ratio is binned with a bin step of 0.05. The locus of the ratios obtained using M_mix as denominator is mapped with the density contours, which are drawn at 10%, 25%, 50%, 68% and 95% of the distribution; with M_mix being the MBH mass calculated using S11 FWHM and our AGN continuum luminosity. For each calibration the blue dashed line shows the equivalence between our mass estimate and M_S11.