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. 2016 Feb 10;6:20798. doi: 10.1038/srep20798

Figure 1. PCA for the data obtained by loading the 13C-CP/MAS-NMR spectra of HSs from Histosols and composted materials.

Figure 1

(A,C) PCA performed using pure spectra. (B,D) PCA performed through integration of regions of pure spectra.