M_BH vs. , in the 10–20 keV band, for the final rev and VD sub-samples (chosen as explained in Sect. 5.2). Filled-blue circles indicate the rev sample data (Type I AGN) while open-red and filled-red squares indicate Type I and Type II AGN from the VD sample, respectively. The blue-dotted and the red-dashed lines show the best-fit lines to the rev and VD (Type I and Type II) data respectively. The solid green line shows the best fit relation using all the data in each panel.