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Fig. 11 The sp2 /sp3 carbon ratio in International Humic Substances Soceity (IHSS) Florida peat, plant-extracted materials (PEMs), humic acids (HAs) and models of HA structure. The uncertain assignment of the 96108 ppm region of several models and the variability in Schulten and Schnitzer's model are taken into account by error bars. In Stevenson's model, the amino acid sidechains (labeled as -R in his model) were not counted due to their vague definition
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