Maximum of the per-a₀ mean values for |F_disk,z∕F_drag,z| (see colorbar), mapped to a 2 AU × 2 AU grid. The gas drag clearly dominates over the (overestimated) disk gravity, especially in the wind region (base of the wind in black). Empty (white) regions above the sonic surface indicate that no particle has been recorded while in this cell, owing to the high grain speeds there (in contrast to Sect. 3, we did not interpolate between recorded particle positions).