Topographic profiles over the honeycomb feature MAT05 on Septemper 20, 2014 (dashed red curve) and March 28, 2015 (solid blue curve), respectively. The path is as indicated in Fig. 15a. It is assumed that the red curve must overlie the blue curve. a) Profiles directly produced by shape-from-shading. The end points of both curves are registered to the shape model (Jorda et al. 2016), thereby removing the respective linear trends. The mean elevation difference is 1.3 m. b) Profiles detrended up to degree four. The mean elevation difference is 0.51 m.