About the Authors
- Yanguang Chen
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* E-mail: chenyg@pku.edu.cn
Affiliation Department of Geography, College of Urban and Environmental Sciences, Peking University, 100871, Beijing, China
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Performed the experiments: YC. Analyzed the data: YC. Contributed reagents/materials/analysis tools: YC. Wrote the paper: YC. Wrote an instruction using MS Word: YC. Made a calculation example using MS Excel: YC. Wrote programs based on Matlab: YC.