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. 2019 Jul 6;24(13):2480. doi: 10.3390/molecules24132480

Figure 2.

Figure 2

(a) Raw near-infrared (NIR) spectra of all 90 samples; (b) section from the raw NIR spectra showing the wavenumber region used for PLSR model calculation; (c) first derivate (13 smoothing points) and standard normal variate (SNV)-transformed NIR spectra region used for total hydroxycinnamic derivatives (THCD) in mg/kg and gallic acid equivalents (GAE)% PLSR model calculation; and (d) second derivate (23 smoothing points) and SNV-transformed NIR spectra region used for rosmarinic acid (RA)% PLSR model calculation.