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. 2016 Aug 5;6:30350. doi: 10.1038/srep30350

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Copyright © 2016, The Author(s)

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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These sites located from north to south include Heihe (HH) in Heilongjiang province, Gongzhuling (GZL)in Jilin province, Hengshui (HS)in Hebei province, Zhengzhou (ZZ)in Henan province, Yanglin (YL)in Shanxi province, and Qiyang (QY) in Hunan province. The map was downloaded from Chinese National Basic Geographical Information System 1:4000000 database (http://www.cehui8.com/3S/GIS/20130702/205.html) and is edited using ArcGIS 9.3 (http://www.esri.com/).