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. 2021 Mar 4;12(3):264. doi: 10.3390/mi12030264

Figure 4.

Figure 4

(A) Score plot resulting from the Principal Component Analysis performed on the spectra composing the Raman map acquired on adenine (red squares), cytosine (blue circles), guanine (green upward triangles) and thymine (magenta downward triangles) samples. (B) Spectral loadings corresponding to the first two principal components.