《Table 2 Statistics of geographical regions covered by datasets published》

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《全球变化科学研究数据出版成果分析（2014-2017）》

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Based on above criteria，343 datasets were categorized into 3 production levels（Table 4）:72.89%of the datasets were in level 2；24.49%of them were in level 3，and only 2.62%of the datasets were in level 4.