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. 2018 Feb 13;8:2962. doi: 10.1038/s41598-018-21339-4

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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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Spatial distribution of the length of water memory during the growing season, from 1982 to 2012, on a monthly basis. Areas with barren land (mean NDVI < 0.1 for all months), permanent ice, and the percentage of missing values greater than 5% in the CRU TS4.01 climate datasets are not shown. The inset shows the frequency distribution of water memory length. NDVI, Normalized Difference Vegetation Index. This map was produced using MATLAB R2016b (http://www.mathworks.com/products/matlab/).