Mean vertical velocities of the data sample with 0 < M_G ≤ 1, in the same spatial volumes as in Fig. 5. The results of each bin in z are averaged over a larger area in the (X, Y)-plane for better visibility; the (X, Y)-grid is convolved with a 2D Gaussian with a standard deviation of 150 pc. The two right columns show the number count in the respective spatial volumes; these quantities account for the smoothing in the (X, Y)-plane and correspond to the effective number of stars that inform the value. A volume cell is masked when this effective stellar number count falls below 100.