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. 2015 Jul 7;6(8):2766–2777. doi: 10.1364/BOE.6.002766

Fig. 2.

Fig. 2

Raman spectra of first three principal component loadings of the PCA, where (a) is PC #1, (b) PC #2, and (c) PC #3; (d) PC #1 loading of the PCA plotted with the spectrum obtained by subtracting the averaged healthy spectrum from that of severe.