Candidate components of Titan’s surface examined in this work: (a) NH₃ in shades of red; (b) CH₄-like organic in shades of light green; (c) CO₂ in shades of turquoise; (d) H₂O in shades of blue; (e) laboratory tholins in yellow-orange; (f) bitumens in gray, and amorphous carbon in shades of green. These spectra are plotted in the spectral range of VIMS at different grain sizes (Bernard et al. 2006; Brassé et al. 2015; GhoSST database, http://ghosst.osug.fr).