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Fig. 4. Ratio of Al needed to precipitate similar amounts of dissolved organic C at pH 4.5 and 3.8 (dissolved organic matter solutions from the Oa and Oi horizons of a beech and a spruce forest, different Al/C ratios). Ratios >1 mean that more Al was necessary at pH 4.5 to precipitate the same amount of C as at pH 3.8.