Fig. 4From: Early warning indicators for mesophilic anaerobic digestion of corn stalk: a combined experimental and simulation approachA comparison of experimental and simulated early warning indicator values in R1 during gradual overload (a) and sudden overload (b), and in R2 during gradual overload (c). Negative values indicate a decrease, while positive values indicate an increase in the value of the respective indicators, at the points of abrupt changes and relative to steady-state valuesBack to article page