Water-ice spatial distributions for SPHERE (top) and NIMS (bottom). The total water-ice abundance (left) is lowest toward the trailing apex and highest at high latitudes, where abundances are >50%. The grain size column (right) shows the ice size endmember with the highest individual abundance. The ice grain size varies with longitude, with larger (300 μm–1 mm) grains more abundant on the trailing hemisphere and smaller grains (100–300 μm) more abundant on the leading hemisphere.