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Multivariate analysis among the cor, phl, and xyl groups. (A): cor-phl; (B): cor-xyl; (C): phl-xyl; (1): PCA; (2): PLS-DA; (3): OPLS-DA; (4): permutation. R2X (cum): cumulative explained variance in the X-direction; R2Y (cum): cumulative explained variance in the Y-direction; Q2 (cum): cumulative predictive ability of the model; R2 and Q2: parameters of the permutation test, used to evaluate model overfitting.
