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PCA score plot (a) and loading Bi plot (b) of CP (blue box) and SPP (red dot). CP and SPP were classified into two clusters. Peaks 3, 6, 7, 9, 10, and 1 are the most important components to distinguish CP and SPP, which will reduce during processing; peaks 2 and 8 are also the most important components for the differences between CP and SPP, which will increase during processing.
