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. 2019 Jan 1;6:4. doi: 10.1038/s41438-018-0077-3

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — Heat map representation of pair-wise correlations between metabolites identified in ‘232’ × ‘1392’ for years 2013 (a) and 2014 (b). Each square indicates a given r value resulting from Pearson correlation analysis in a false color scale (red and blue indicate positive and negative correlations, respectively). The self-comparisons are indicated in white