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(a) Mean daily methane concentration during the baseline collection phase (week 1–3, before Polygain™) and during the following 3-week intervention period (week 4–6, After Polygain™). (b) Median daily methane concentration during the baseline collection phase (week 1–3, before Polygain™) and during the following 3iweek intervention period (week 4–6, After Polygain™). * Indicates statistical significance (p < 0.05).
