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(a) First, second, and third principal components (PC1, PC2, and PC3, respectively) from PCA analysis of Raman spectra at 10 selected locations of different Omicron subvariants and (b) loading vectors of second and third principal components PC2 and PC3 as computed over a PCA analysis of the Raman spectral region 600–1800 cm–1. The plot clearly separated the XE and BA.2.75 subvariants but suffered deficiencies in locating all other Omicron subvariants.
