Velocity lag in ESO 544-27. Left panel: velocity map. Right panel: vertical velocity profile. The velocity profile has been obtained by averaging the absolute velocity at each height. The black dashed line in both the map and the profile indicates the midplane. The black dots show the measured velocities, and the red lines show the fits to the velocity profile on both sides of the midplane. The absolute values of the slopes of the lines, or the lags above and below the midplane, are given in the right panel.