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(a) Y-fit graph of the prediction of Robusta concentration in liquid mixtures N = 30; (b) PLSR analysis on the dataset containing marketed blends B10% and B30% and the mixtures, N = 36; (c) Regression vector of the predictive model (b) in the 800–1100 nm range. Spectral pre-processing: Averaging consecutive scans, Savitzky-Golay smoothing (window size 19), 1st derivative.
