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Regression plots of the size of the AM-induced change in carbon exchange rate (CER) (A), stomatal conductance (gs) (B), and transpiration rate (E) (C) as a function of publication year. lnR is natural log of the AM/NM response ratio for each gas exchange parameter. Darker center line is the model prediction; lighter lines are 95% confidence intervals. Each symbol represents one study, with symbol size indicating its weighting.
