Acceleration stratification for a hydrodynamically consistent model. The wind acceleration (thick red diamond line) is compared to the repulsive sum of inertia and gravitational acceleration g(r) (black line). The fact that these two curves are (almost) identical illustrates that the hydrodynamic equation is fulfilled throughout the stellar atmosphere. For a more convenient illustration, all terms are normalized to g(r). The input parameters of the model are compiled in Table 1 while the resulting quantities can be found in Table 3.