Figure S1. Frequency distribution of alkalinity generating processes in the dataset used for the present study. (A) log₂ nitrogen burial, (B) log₂ denitrification, (C) log₁₀ net sulfate reduction and (D) log₁₀ potential net sulfate reduction when methanogenesis is inhibited (PSR). Process rates were converted to alkalinity generation according to Eq. [2]. Labels of x axes denote class minima.