Depressions were detected in three regions: Left foot & right foot, Rahe, and Hemenway. The black solid lines show the results of the edge detection technique. The red contours indicate the relative elevation labeled with depth (m). The outermost contours of each region represent the borders of the detected depressions. The x- and y-axes of each region are projected distances (km). In each plot, the horizontal and vertical axes indicate arbitrary Cartesian coordinates on the triaxial ellipsoid surface.