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Fig 1.

The theoretical framework.

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Fig 2.

Location of the Jianghan Plain, Hubei Province.

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Table 1.

Index system for the evaluation of UREC.

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Table 1 Expand

Fig 3.

Temporal evolution of the UREC index in 2013-2020.

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Fig 4.

Temporal evolution of indicators of UREC from 2013 to 2020.

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Fig 5.

Spatial evolution of the UREC index.

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Fig 6.

Spatial evolution of the indicators of the circulation content index.

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Fig 7.

Spatial evolution of the indicators of the circulation carrier index.

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Table 2.

Results of the analysis of the influencing factors of UREC based on stepwise regression.

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Table 2 Expand