Ratio of BLR and dust continuum sizes as a function of (a) the AGN luminosity and (b) the Eddington ratio. The p-values of Spearman’s rank correlation coefficient are reported in the lower right corner of each panel for RM- and OI-measured samples. The notations are the same as in Fig. 2. The error bars are the quadrature sum of the uncertainties of R_BLR and R_d. Panel c displays the histograms of the ratios. The dashed lines indicate the averaged R_BLR/R_d based on the fitting of the R_BLR–R_d relations with β fixed to unity (see also Eq. (4)). R_BLR/R_d does not show a statistically significant correlation with the λL_λ(5100 Å) or the Eddington ratio. The linear scale of R_BLR/R_d is indicated on the right.