Comparison between the KERRBB BH mass estimates M_BH, fit (inferred from the SED fitting procedure) and the SE BH masses M_BH, SE computed using the equation of Vestergaard & Peterson (2006) and the Hβ line (we excluded the two high-redshift sources, PG 1247+267 and S5 0836+71, for which we only have information on the CIV line; see Table A.2). The blue shaded area, the dashed black line, the reported labels, and the uncertainty bars are the same as in Fig. 2.