Overview of chemical families present in the S⁷⁺-over-irradiated residue: (A) Ar⁷⁺-irradiated ice); (B) S⁷⁺-over-irradiated residue); (C)S⁷⁺-irradiated ice). Error vs. m/z plots are shown for validation the molecular formula annotation. Pie charts represent the distributing of different chemical families, and H/C vs m/z and H/C vs O/C illustrate the distribution of the chemical families CHO, CHNO, CHOS and CHNOS. Dashed lines represent mean values.