Illustration of the radiative acceleration for a model with 10 M_⊙ and T_* ≈ 115 kK which is not capable of launching a wind from the “hot iron bump” and thus is dynamically not converged: In the inner part, the total radiative acceleration (red dashed line) approaches Γ_rad = 1, but does not surpass it sufficiently to launch a wind that could be maintained in the following deceleration region.