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We document the similarities in composition between the equatorial basins TuiRegio, Hotei Regio, and other 5-$\mu$m-bright materials, notably the northpolar evaporites, by investigating the presence and extent of an absorptionfeature at 4.92 $\mu$m. In most observations, Woytchugga Lacuna, Ontario Lacus,MacKay Lacus, deposits near Fensal, some of the lakes and dry lake beds southof Ligeia, and the southern shores of Kraken Mare share the absorption featureat 4.92 \um observed in the spectra of Tui and Hotei. Besides Woytchugga and atFensal, these 5-$\mu$m-bright deposits are geomorphologically-substantiatedevaporites. Thus, the similarity in composition strengthens the hypothesis thatTui and Hotei once contained liquid. Other evaporite deposits, however, do notshow the 4.92 \um absorption, notably Muggel Lacus and the shores of LigeiaMare at the north pole. This difference in composition suggests that there aremore than one kind of soluble material in Titan's lakes that can createevaporite and/or that the surface properties at the VIMS wavelength scale arenot uniform between the different deposits (crystal size, abundance, etc). Ourresults indicate that the surface structure, composition, and formation historyof Titan's evaporites may be at least as dynamic and complex as their Earthcounterparts.

Compositional Similarities and Distinctions between Titan's Evaporitic Terrains