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. 2020 Aug 31;412(25):6789–6809. doi: 10.1007/s00216-020-02839-7

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© The Author(s) 2020

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Fig. 8 — PCA analyses of measured constituents. Panels a and b show the scores plot of the first 2 principal component analysis of the concentration of the measured constituents by HPLC and NMR, respectively. Panels c and d show the loading plots from the concentration of the measured constituents by HPLC and NMR, respectively. 95% confidence intervals are shown with ellipses based on the color groups in panels a and b