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. 2024 Mar 6;6(1):21. doi: 10.1007/s42773-024-00309-2

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© The Author(s) 2024, corrected publication 2024

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Fig. 3 — Linear correlations between (a) the molar O/C (oxygen/carbon) ratio of biochar and effect size of 7-day compressive strength, (b) the natural log-transformed specific surface area of biochar and effect size of 7-day compressive strength, (c) the molar O/C ratio of biochar and effect size of 28-day compressive strength, and (d) the natural log-transformed specific surface area of biochar and effect size of 28-day compressive strength. Points in each figure represent paired records. The simple linear regression lines with 95% confidential intervals are shown, with the number of records (n) presented. The horizontal dash lines represent the value of 0