Resulting acceleration stratification of the converged models with two different treatments of nonmonotonic velocity fields: The dashed red and black lines illustrate the two sides of the hydrodynamic equation of motion for a model where negative velocity gradients are ignored in the solution. The corresponding solid lines show the result for the alternative method where the nonmonotonic υ(r) is interpolated afterwards. The small inlet shows the resulting velocity fields for both models. In this example we show models with T_* = 125 kK, log L/L_⊙ = 5.475 and M = 15 M_⊙.