Comparing CO₂ exosphere to H₂O and CO₂ distribution on Ganymede’s surface. Top and bottom rows are for the leading and trailing hemispheres, respectively. A, D: CO₂ gas column density maps at a 3×3 smoothed resolution (this work); B, E: H₂O band depth at 4.5 μm (Paper I); C, F: CO₂-solid 4.3-μm band depth (Paper I). In these plots, unlike in Figs 1 and O.1, the same color scales and boxcar smoothing are used for leading and trailing.