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The carbon isotopic composition of the DIC (δ13CDIC) over time with the different treatments as a result of the initial labeling with 13C-glucose (g) and 13C-methane (m) and the addition of hematite (A). (B) Magnified view of A showing elevated 13C enrichment in the hematite treatment relative to methane and the killed control. The error is smaller than the symbol.
