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. 2020 Sep 23;9(10):1343. doi: 10.3390/foods9101343

Figure 2.

Figure 2

Averaged UV-Visible spectra of the 8 botanical species after SNV pre-treatment of data. For each species, the four averaged spectral profiles of the Calibration set (Table 2) are highlighted in grey while in red are reported the External Test set samples (Table 3).