Supplementary Figure 5: IR spectra of ovarian cancer samples measured by different operators at the same institution.
From: Standardization of complex biologically derived spectrochemical datasets

a,b, Average (a) raw and (b) preprocessed spectra for cancer samples acquired with instrument A depending on the operator. c,d, Average (c) raw and (d) preprocessed spectra for cancer samples acquired with instrument B depending on the operator. e,f, Average (e) raw and (f) preprocessed spectra for cancer samples acquired with instrument C depending on the operator.