The band depths and centers of Callisto’s 4.57 µm feature for three viewing geometries. The trailing hemisphere and Asgard-centered data were previously published by R. J. Cartwright et al. (2024). The centers of the following geologic units are marked with symbols: Valhalla, ⋆; Asgard, ∘; Lofn/Heimdall, △. The subobserver longitude of the observation is indicated in the panels. The projected angular size of Callisto varies slightly between each observation, so the spaxel scale is slightly different in each panel. Typical uncertainties are ±0.15% for the band depth and ± 0.001 µm for the band center.