Angular dependence of the radiative force parameter for models M₁, M₂, and M₃ (when M(τ) = 0; thin dashed lines) and models , , and (when M(τ)≠0; thick lines). The horizontal line marks the value . Just below this value, the matter undergoes a pure accretion process (type 1 solution), while above this value, it transitions to a type 5 outflow solution (which we discard). Each pair of models (M_i, ) uses the same boundary conditions.