The residuals of dividing Cybele’s spectrum against the model are shown (as crosses) together with the spectra of organics with different composition. In yellow is the spectrum of a sample of Insoluble Organic Material from Orthous-Dauna et al. (2010) showing the contribution of the aliphatic structure. The purple line is the spectrum of an average of six polycyclic aromatic hydrocarbons from Colangeli et al. (1992).The red line is the spectrum of ice tholin from Khare et al. (1993).