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. 2018 May 15;8:7572. doi: 10.1038/s41598-018-25862-2

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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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Comparison of hemispheric model temperatures, pseudoproxies and real proxy reconstructions over the past Millennium. Real proxy temperature reconstructions (black, grey shaded area indicating: 90% ensemble range), model truth (red) and pseudoproxy reconstructions using synthetic proxies based on local (blue) and hemispheric mean (yellow) correlations for the CESM1-CAM5 (member 1) simulation over the past Millennium. (a) SH, (b) NH and (c) standardized NH-SH difference. A 30-year loess filter was applied to all curves. Data in (a) and (b) are centered on the climatological base period of 1961–1990.