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Gibbs free energy changes of secondary fermentation reactions as specified in Table 1, based on interspecies hydrogen or formate transfer in sediment cores taken in Lake Constance at three different water depths (2 m, 10 m, and 80 m). In panels f and g, energetics of fermentations according to Syntrophobacter are shown with solid lines, and those according to Smithella are shown with dashed lines.
