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(a) PCA-LDA Classification of pure ground Arabica (ARA1, ARA2, ARA3), Robusta (ROB1, ROB2, ROB3) and marketed blends B10%, B30% in the range 1300–1600 nm, N = 72, spectral pretreatment: Savitzky-Golay smoothing (window size 19) and 1st derivative; (b) PLSR analysis of the ground coffee mixtures and B10% and B30%, spectral pretreatment: Savitzky-Golay smoothing (window size 17) and SNV; (c) The respective regression vector in the 1300–1600 nm.
