α_ox as a function of (a) Eddington ratio and (b) bolometric luminosity. We find a strong anticorrelation of α_ox with both the parameters (see Table 3). The solid black lines show our best-fit relations and the shaded gray regions are the one sigma confidence interval for each relation. Our linear relation between α_ox and λ_Edd is flatter when compared to the one reported by Lusso et al. (2010; dashed red line), but consistent with Grupe et al. (2010; dotted green line) and Jin et al. (2012; dash-dotted blue line).