Comparing CO₂ exosphere to surface properties on Ganymede’s leading hemisphere. (A) Vertical CO₂ gas column density (in units of 10¹⁸ m⁻², this work, see also Fig. O.2); (B) Depth of CO₂-solid absorption band (Paper I); (C) Central wavelength of CO₂-solid absorption band (Paper I); (D) Reflectance at 3.65 μm (Paper I); (E) Central wavelength of H₂O Fresnel peak (Paper I); (F) Relative amplitude of the maximum reflectance between 3.5 and 4 μm (H₂O interband amplitude, Paper I). The north pole of the leading hemisphere possesses the most redshifted absorption band center of solid CO₂, consistent with CO₂ trapped in amorphous H₂O ice (Paper I). It also has the highest reflectance at 3.65 μm and H₂O interband amplitude, indicative of a higher density of facets in H₂O ice for the photons (i.e., smaller grains and/or more internal defects and/or higher micro-roughness or porosity), and the most blueshifted central wavelength of the H₂O Fresnel peak due to a higher proportion of amorphous water ice (Mastrapa et al. 2009).