CO₂ gas distribution above Ganymede surface. First and second rows are for the leading side, at the original and 3×3 boxcar smoothed (for higher S/N) resolutions, respectively. Bottom row is for the trailing side at 3×3 smoothed resolution. Plots on the first column show the Pearson correlation coefficient between continuum-filtered residual CO₂ gas emission and a forward CO₂ fluorescence model at 105 K (Fig. H.1). Plots on the second and third column show the line-of-sight CO₂ column density and S/N inferred by fitting synthetic CO₂ fluorescence spectra (Appendix B). The color scales for the leading and trailing sides are different, and indicated above the plots. Pixel sizes are 0.1×0.1”. The green lines show the open-closed field-line boundary Duling et al. (2022)