a) NAC image showing the Apis region and its surroundings. Note the region’s dark tone in comparison to Ash and its flat appearance in comparison to Atum. Arrows point to locations of the boundaries between adjacent regions b) and c) Cropped parts of a NAC image showing the polygonal fracture patterns in the region. The view in b) is rotated 110° anticlockwise with respect to a). Note the large 30 m-long boulder in c) (arrow), which appears to be fractured as well.
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