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The analysis of NIR images of medicinal plants. PCA score image (t1) of Echinacea sp. leaf powders based on color amplitudes (a). The corresponding score plot (PC1 vs. PC3) shows minimal separation of the pixel clusters (b). (EAL—E. angustifolia leaf, EPL—E. purpurea leaf, EPaL—E. pallida leaf). Reproduced in compliance with CC BY license from Ref. [80].
