Figure 4.

Interpretation of a segmentation map of the MALDI-imaging dataset. Spatial segmentation analysis of the MALDI-imaging dataset from Figure 2 with our algorithm from [30]. A. Segmentation map (two clusters) overlaid with the optical photo of the section. B. Mean spectrum of spectra from the second cluster. C. Pseudo-colored images of m/z-values spatially co-localized with the second cluster; each title shows the m/z-value, Pearson correlation between the image and the cluster spatial map, and 90%-quantile image intensity.