Top: absorbance spectra (–log(reflectance)) of CO₂ ice (50 K) measured using INGMAR (e.g., E. Hénault et al. 2025) and CO₂ clathrates (110 K; A. Oancea et al. 2012). These laboratory spectra are compared to G395M reflectance data of Ariel trailing and Umbriel trailing, converted to absorbance (–log(reflectance)) and offset vertically for clarity. Bottom: scaled versions of the CO₂ ice and CO₂ clathrates spectra, and linear combinations of these two laboratory spectra, fit to the G395M data, offset vertically for clarity. These scaled spectra of CO₂ ice and CO₂ clathrates provide reasonable matches to the 4.38 and 4.4 μm features, respectively. Additional features near 4.36 and 4.41 μm are not well matched by these laboratory species. These scaled spectral data offer useful but nonunique solutions, and other scaled combinations warrant study in future work.