Supplementary Figure 6: PCA scores for preprocessed spectra acquired by different operators at the same institution.
From: Standardization of complex biologically derived spectrochemical datasets
a,b, PCA scores for (a) healthy control and (b) cancer samples acquired with instrument A depending on the operator. c,d, PCA scores for (c) healthy control and (d) cancer samples acquired with instrument B depending on the operator. e,f, PCA scores for (e) healthy control and (f) cancer samples acquired with instrument C depending on the operator. Confidence ellipse was 95%, depicted in blue.
