Configuration leading to distortion seen in map of average positions of stars along vertical direction (middle panel) and in surface density of stellar component seen edge-on (along y, lower panel) for one selected time, t = 4.85 Gyr. The dashed arrows indicate the correspondence between the distortions rotated by the bending wave differently at different radii and the maxima and minima of the distributions of the stars in the face-on position map and edge-on density map.