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. 2018 May 2;9:1767. doi: 10.1038/s41467-018-04207-7

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© The Author(s) 2018

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. 6 — Logistic regression analysis. Non-linear relationships between 10-year scPDSI and a regional temperature and b seasonal NAO for 1500–2012, as presented by the logistic regression coefficients as estimated by Eq. 2 (see Methods; positive sign correspond to positive correlation). The corresponding statistical significance is presented in Supplementary Fig. 4