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Principal component analysis (PCA) of all of physical–chemical parameters analyzed and the components extracted by PARAFAC analysis from the entire data set: Loading plot (a) and score plots (b) obtained of the two first principal components (PC1 and PC2). Codes: A, VOO1; B, VOO2; C, VOO3; D, VOO4. The numbers after the codes mean the months of the storage when the samples were collected.
