Probability distributions for the half-light radii of the V-band (solid) and full X-ray (dashed) emission. The gray area corresponds to predicted values of r _g , where the lower and upper limits are for M _BH = 0.9 × 10 ⁹  M _☉ (C iv; Morgan et al. 2010) and M _BH = 2.4 × 10 ⁹  M _☉ (Hβ; Assef et al. 2011), respectively.