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. 2015 Oct 9;5:14638. doi: 10.1038/srep14638

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Loadings of the original data (diffuse reflection coefficients) to PCs from PCA composite samples stained in (a) tea, (b) coffee, (c) red wine, (d) Coca-Cola, (e) Colgate mouthwash, and (f) distilled water relative to the baseline group.