Distribution of the X-HESS AGNs (in green) in the Γ − R_S/P plane zoomed in on the region where R_S/P ≤ 3.5. The sample of PG QSOs by Piconcelli et al. (2005) and the high-λ_Edd AGNs studied by Laurenti et al. (2022) are shown in brown and cyan, respectively. The dash-dotted black line indicates the best-fit relation for the PG QSOs. The solid black line describes the BCES x|y best-fit relation derived from the X-HESS AGNs, while the shaded area indicates the 90% confidence band.