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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Test-set prediction results based on benchtop (XDS) data to predict pine bark extract concentration: (A) Y-fit plot using PLSR; (B) Y-fit plot using SVR; (C,D) corresponding regression vectors.