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. 2020 Jun 30;7:201. doi: 10.1038/s41597-020-0530-7

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© The Author(s) 2020

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. 3 — Global mean surface temperature from the Temperature 12k database using different reconstruction methods. The fine black line is instrumental data for 1900–2010 from the ERA-20C reanalysis product²⁶. The inset displays an enlarged view of the past 2000 years. See Fig. 2 for additional explanation.