Quasi-stationary surface density Σ_stat(r) for M = 10⁷ M_⊙ and α = α_cold at several values of Ṁ, indicated in the graphs in units of Ṁ_Edd (upper panel). Radial distributions of the critical points Σ⁺ for α_hot and Σ⁻ for α_cold together with the stationary distributions (middle panel). The latter are shown only for Σ_stat < Σ⁻. Superimposed are the radial dependencies of the critical points Σ_A and Σ_adv for α_hot (bottom panel). In all panels, α_cold = 0.01 (blue) and α_hot = 0.1 (orange). The curves are plotted starting from 5R_S.