a) NAC image showing the Khepry and Aker regions as well as parts of Babi and Aten. For the exact boundary between the two regions refer to Fig. 2. Note the angular fractures, which are shown as close-up in d), which are associated with the ridge separating Aker from Babi (arrows) and further highlighted in Fig. 6b. b) NAC image showing parts of the Khepry region. Note the rough surface texture and the ponding of smooth deposits in topographic lows, which is further highlighted in c). Arrows point to parts of the boundary between Khepry and Aker. c) Close-up view of same image in b) showing one of the smooth patches in Khepry. d) Cropped NAC image showing the angular fractures in Aker, which measure ~200 m in length. The view has been rotated ~90° with respect to Fig. 3a for clarity.