Left: histogram of Γ values for our main sample. It is important to keep in mind that the Γ values included herein are estimates calculated from HRs and have larger errors than Γ values measured directly from the X-ray spectra. Right: histogram of Δα _ox values for our sample. The distribution is similar to that shown in Figure 4 of Gibson et al. (2008), which consists of RQ, non-BAL quasars.