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Figure S1. Variation in C yield with increasing production temperature. Error bars were added to the graph to show standard error of C % analysis, but are not visible due to the scale of the data (n = 2).

Figure S2. Influence of temperature on the (a) O : C ratio and (b) H : C ratio of biochar samples and parent biomass.

Figure S3. Comparisons between proximate and elemental analysis data to show correlations between (a) fixed C vs. O : C ratio, (b) fixed C vs. H : C ratio, (c) volatile matter vs. O : C ratio, (d) volatile matter vs. H : C ratio.

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