Topography at the SPLD basal interface, based on MARSIS measurements of SPLD thickness. A indicates a depression below a distal SPLD lobe. B indicates relative highs within the remnant Prometheus basin (basin rim indicated with arrows). C indicates depressions in near-polar region.Credits: NASA/JPL/ASI/ESA/Univ. of Rome/MOLA Science Team/USGS
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