Mean properties of the velocity fields of the three stellar simulations (G2V is the solid yellow line, K0V is the dashed orange line, and M2V is the dot-dashed brown line) averaged over time and surfaces of constant number of pressure scale heights N_p (Eq. (5)) versus N_p. Left panel: ratio of RMS horizontal and RMS vertical velocities. Middle panel: RMS vertical velocity. Right panel: Mach number. Three top axes on each column: geometrical height for the three stars.