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In basic solution, sulfur species that would disproportionate can be identified from the Frost diagram by looking for species that lie above a line connecting the two species involved in the disproportionation reaction. For example, sulfur(IV) (SO3^2-) lies above the line connecting sulfur(VI) (SO4^2-) and sulfur(II) (S2O3^2-), indicating that it can disproportionate into these species.