Sensitivity analysis of the 2.7 µm band center to minor amounts of H₂O ice and salts. In each panel, the black spectrum is the Ceres average spectrum from J.-P. Combe et al. (2016); the orange spectrum corresponds to (a) the H₂O ice spectrum from J.-P. Combe et al. (2016) and (b) the brine spectrum (Sol. 3) from E. C. Thomas et al. (2019); the blue spectrum represents a mixture of the Ceres average with (a) H₂O ice or (b) salts. The band centers of the Ceres average and the mixtures are noted. The vertical dashed lines illustrate the diagnostic features of H₂O ice and salts.