Upper panels: redshift distributions of BL Lacs (left panel) and of FSRQs (right panel) from the samples by Kühr et al. (1981) (solid points) and Jackson et al. (2002) (empty points), and the corresponding fits (solid and dashed lines, respectively). Lower panels: histograms of the Doppler factor as obtained by Ghisellini et al. (1993) (dashed lines) and Gu et al. (2009) (dotted lines) for BL Lacs (left panel) and core-dominated quasars (right panel). The solid line in the right panel is the fit of the two δ distributions for core-dominated quasars.
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