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. 2019 Oct 1;5(10):e02547. doi: 10.1016/j.heliyon.2019.e02547

Fig. 2.

Fig. 2

Principal component analysis (PCA) of NMR spectra. NMR spectra reflecting the metabolites composition of urines in each patient were analyzed with an unsupervised method (PCA) resulting in a classification of CHD patients in two distinct clusters (RED and BLACK). PC1 and PC2: principal component 1 and 2.