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. 2020 Dec 12;9(12):1855. doi: 10.3390/foods9121855

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© 2020 by the authors.

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 (http://creativecommons.org/licenses/by/4.0/).

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Principal components analysis (PCA). (a) 3D Plot of component weights for the geographical variables and the carbon, oxygen and hydrogen (δ¹³C, δ¹⁸O and δ²H) isotope composition of VOO samples; (b) 3D Score plot of VOO samples from France, Portugal and Turkey in 2016 and 2017.