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. 2023 Feb 7;106(1):00368504231152742. doi: 10.1177/00368504231152742

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© The Author(s) 2023

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (https://creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access page (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 4. — Spatial evolution maps of modified input-oriented Luenberger productivity index (MIL) in Yellow River basin: (a) Whole basin, (b) upstream region, (c) midstream region and (d) downstream region.