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. 2015 Nov 16;5:16630. doi: 10.1038/srep16630

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Copyright © 2015, Macmillan Publishers Limited

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Same as Fig. 2, but shows the linear trend (days/decade) of annual frequency of extremely cold days in the warming (1982–1997, a) and hiatus periods (1998–2013, b). Black points/lines in the shading color indicate the trends in those locations are significant in statistics (P < 0.05). We generated the two sub-panels (a,b) using Matlab and integrated the sub-panels into this figure.