N_Htor–λ_Edd plane. The solid black line shows the effective Eddington limit introduced by Fabian et al. (2006). The dashed cyan and dash-dotted green lines show this limit if the radiation pressure on dust is considered, assuming one and two times the galactic dust-gas ratio, respectively. The shaded areas show the three areas that cover the different stages according to the radiation-regulated unification model proposed by Ricci et al. (2017). The solid gray line shows the limit where the N_Htor could have an important contribution from the host galaxy. Symbols and colors follow the conventions used in the previous figures.