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Rat brain dataset. (A) Optical image. (B) Schematic representation based on the rat brain atlas, reproduced from (Alexandrov et al., 2010) with permission from the American Chemical Society. (C–I) Segmentation maps, q=20, k=10. C. Straightforward k-means clustering of spectra. (D–F) SA method. (G–I) SASA method.
