Fig. 11

a Cumulative SFD of both confirmed and candidate positive relief features of Region B (solid line) and Model 1’s extrapolation (dotted line). b Cumulative SFD of both confirmed and candidate positive relief features of Region B (solid line) and Model 2’s extrapolation (dotted line). c Shaded relief image of the DTM of Region B-equivalent area with the Model 1’s extrapolation of positive relief features; d shaded relief image of the DTM of Region B-equivalent area with the Model 2’s extrapolation of positive relief features