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. 2021 Aug 31;59(1):1170–1178. doi: 10.1080/13880209.2021.1969414

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© 2021 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.

This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 4. — The scores of orthogonal partial least squares discriminant analysis and their 200 times permutation tests: (A1) CG vs. MG score under positive ion mode; (A2) All groups score under positive ion mode; (B1) CG vs. MG score under negative ion mode; (B2) All groups score under negative ion mode (model parameters-A1: R²Y = 0.794, Q² = 0.728; A2: R²Y = 0.978, Q² = 0.876; B1: R²Y = 0.994, Q² = 0.968; B2: R²Y = 0.973, Q² = 0.894).