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PCA score image (t1) of Echinacea root and leaf powders showing distinction of the three species based on colour amplitudes (a). The corresponding score plot (PC1 vs. PC2) shows distinct pixel clusters coloured according to score values that correspond to the images (b). (EAL—E. angustifolia leaf, EPL—E. purpurea leaf, EPaL—E. pallida leaf, EAR—E. angustifolia root, EPR—E. purpurea root, EPaR—E. pallida root).
