Two-dimensional snapshots of a CD section at 30 min intervals showing the derivation of the distorted CD shape. Radial lines (light gray lines) are traced from the pulsar (red point; not in scale) in all directions. If a line intersects the surface of a shocked clump (light blue disks) before reaching the smooth-wind CD (black dashed line), then a distorted-CD point is placed at this location; otherwise, the intersection point of the radial line with the smooth-wind CD is added to the grid. The new grid of points (dark blue points on the blue line) representing the distorted CD is fitted by a spline (blue solid line).