Sample continuum-divided CO₂ absorption features on Callisto. Sampled regions include a spaxel from near the center of the Valhalla impact basin, a spaxel from the CO₂ enrichment near the Lofn/Heimdall impacts in the southern hemisphere, and a spaxel from the center of the trailing hemisphere. The vertical lines at the bottom of the plot indicate the best-fit band center for each spaxel. The uncertainties in the band centers are given in parentheses.