Scarp (indicated by the red arrow) in Ma’at occurred between December 2, 2014 (a) and March 28, 2015 (b). The sharp edges (indicated by the green arrows) of a few tentative half-buried boulder had been exposed by the retreat of the surrounding dust deposits. Yellow arrows point to common features in two images as landmarks. The observation in (a) was taken at the phase angle of 91◦ with the pixel resolution of 0.52 m. b) was taken at the phase angle of 68◦ with the pixel resolution of 0.5 m (Table A.1).