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Comparison of the three different methods (Band integration, Cluster analysis, and Non-negative-matrix factorization (NMF)). a Overlay of all compounds from each method. The Raman images were rasterized, and 3D extruded for better visualizing the overlaying nature of the different compounds. b–g Sections of the Raman images (Figs. 2, 3, 4) from each method to compare each extracted layer. On the right the corresponding spectra
