Fig. 1From: Early warning indicators for mesophilic anaerobic digestion of corn stalk: a combined experimental and simulation approachA comparison of experimental and simulated CH4 yields (a1, a2) and CH4/CO2 ratios (b1, b2) related to the laboratory experiments. Data presented in subplots a1 and b1 represent R1, while those in subplots a2 and b2 represent R2Back to article page