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Figure 2: Depth-to-diameter ratio distribution in different units within the Chryse Planitia. a): Bouguer gravity map of the Chryse and Acidalia Planitia overlain on the THEMIS day-time Infrared data. Thin white lines outline the boundary of four units where impact crater depth and diameter are analyzed. b-c): The depth-diameter scatter plot and kernel density distribution of depth/diameter ratio for b) the Chryse anomaly unit and small anomaly unit, J. Geophys. Res, vol.107, 2012. ,