Fig. 4: Bulge width and height measurements from topographic profiles.

The red line is a linear approximation of the present stream (profile P0) with a constant slope of 0.9°. The northern section of each profile is fitted to that trend. The part of the profile above the trend along the southern section is defined as the bulge. Dashed lines indicate how the dimensions of the bulge are defined along with values and uncertainties. For profiles P0 to P7, x-axis is the distance from the scarp toe in meters, y-axis is the elevation in meters.