Left: C IV parameter space for our sample colored by the log of He II EQW. The error bars are the same as in Figure 2. Right: same plot colored by α _ox instead. The markers are the same as the top panel of Figure 4. Despite our cut on Γ to remove absorbed objects, it is clear that there are still factors that affect the usefulness of α _ox as an indicator of the shape of the ionizing SED in comparison to the log of He II EQW, such as variability.