Fig. 3
Identification of the circular depressions on different sides of the comet nucleus surface: a) Seth; b) Ash and Atum; and c) Seth. The picture on the right-hand side of each panel is shown for comparison with the markings of the circular depression structures on the left-hand side. The depth-to-diameter ratios (d/D) are determined by using the digital data of the shape model.
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