Distributions of model parameters as a function of ﹩{N}_{{\rm{H}}{\rm{I}}}﹩ and normalized impact parameter for our updated photoionization models. These models assume a Bayesian prior for ionization parameter as a function of ﹩{N}_{{\rm{H}}{\rm{I}}}﹩, which is shown as 1σ, 2σ, and ﹩3\sigma ﹩ contours in the top panel. Each panel has a solid line with a dotted extrapolation that shows the relationship found by Werk et al. (2014) for COS-Halos absorbers. As in Figure 7, symbol size is indicative of our confidence in the photoionization models, with higher-confidence absorbers having larger plot symbols. The dashed line in the bottom panel is our power-law fit to the combined targeted, serendipitous, and COS-Halos data, and is described in Section 5.4.