Correlations between virial masses. The lines labelled in the upper left of every panel refer to Y and X axis respectively. 1st column: correlations between C iii]-based virial masses and masses derived from the other lines. The black dashed line represents the 1:1 relation. Intercept and scatter for all the relations are given in Table 6. 2nd, 3rd and 4th columns: M_BH measurements for Mejia-Restrepo et al. (2016, (black points), Ho et al. (2012, green points) and this work (red points) samples obtained with the prescriptions by Mejia-Restrepo et al. (2016, see the main text for details on the used prescriptions and the luminosities). Black dashed lines represent the 1:1 relation. M_BH estimates for our sources are given in Table 5.