Mach number of the inflow (solid lines) and outflow (dotted lines) solutions of Eq. (20) with M(τ) = 0. The supersonic part of the inflow solutions are depicted in orange, and the subsonic part is given in blue. In contrast, the supersonic outflow solution is depicted in blue and the subsonic one in orange. The vertical lines in each frame mark the position of the sonic radius. When the radiation dominates, the gas escapes from the gravitational potential of the accretor. With no force multiplier, no winds are developed for f_⋆ = f_disc = 0.5 (model M₁).