Acceleration stratification comparison between the WN4b β = 1 grid model (H19, black lines) and the PoWR^HD model (red lines) of WR1. The main wind deceleration terms (gravity g and wind inertia a_mech) are solid lines, while the main acceleration terms (radiative force a_rad and pressure gradient a_press) are dashed lines. The grey horizontal line depicts the accelerations equal to gravity. The reason for the difference in outermost radii is the same as in Fig. 3.