The intrinsic dust extinction of the AGN emission in the optical/UV due to the host galaxy, quantified by the parameter E(B − V)_HG, calculated from the optical/UV SED fitting (described in Sect. 6). (a) Distribution of the best-fit values of E(B − V)_HG and (b) E(B − V)_HG as a function of the redshift (upper limits shown as downward arrows). The solid black line shows the best-fit relation excluding the upper limits and the shaded gray region marks the one sigma confidence interval. We find a similar relation if we include the upper limits using survival analysis and hence, do not show it here.