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. Author manuscript; available in PMC: 2020 Jul 2.
Published in final edited form as: Anal Chem. 2019 Oct 24;91(21):13703–13711. doi: 10.1021/acs.analchem.9b02992

Figure 2.

Figure 2.

(A) Optical image, unsupervised segmentation results, and ion overlays of prioritized features using segmentation. Features for ion overlays and replicates of segmentation results are shown in Figure S4. (B) Six mass spectra were extracted throughout the location of each segment with locations shown in PCA regions. The PCA of these mass spectra demonstrate the discrete chemical profiles of each segment.