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Comparison of ND, MD, ComGrad, and BLD measures: Case 1—high similarity and weakly winding contours; Case 2—low similarity and weakly winding contours; Case 3—medium similarity and strongly winding contours; Case 4—winding contours with concave and folded curves. The solid lines are reference contours and the dashed lines are test contours. For easy illustration, the linked lines between contours indicate measured distances.
