Velocity and temperature gradients in SFCT stellar models with the new boundary conditions discussed in this paper. Left panel: velocity profile in the outer layers. Right panel: Temperature gradient of the medium ∇ in the same region. Both are displayed as a function of log P in the atmosphere of the 1.0 M_⊙ at the Sun’s position (log L/L_⊙ = 0 and log T_eff = 3.762). The new boundary conditions are applied for log P ≤ 6.0. In both panels we show the results for the MLT and SFCT as indicated.