Polar contour map of the centroid residuals. The upper panel shows residuals inside the cavity, the middle panel residuals between the cavity and the outer edge of dust ring, and the lower panel the residuals in the outer disk. The radial spacing between each contour is ∼1.8 au, and the opacity of the lines increases with radius. We would like to emphasize that the bump between PA≈ − (110 − 70)° in the middle panel includes most of the residual points we detect with the peak variance method of discminer, which can be readily seen in the left panel of Fig. B.1.