Table 4 Synergistic level of urbanization and ecological environment in the Chengdu–Chongqing urban agglomeration from 2001 to 2020.

Chengdu metropolitan area	2001	2020	Average value^①	Chongqing metropolitan area	2001	2020	Average value^①
Chengdu	0.3282	0.8245	0.5584	Chongqing	0.3712	0.8419	0.6050
Zigong	0.1755	0.5161	0.3277	Wanzhou	0.1864	0.5320	0.3412
Luzhou	0.1239	0.4630	0.2582	Qianjiang	0.0968	0.5399	0.2685
Deyang	0.1969	0.5419	0.3453	Fulin	0.1940	0.6840	0.3992
Mianyang	0.1440	0.4633	0.2810	Changshou	0.1810	0.6652	0.3960
Suining	0.1356	0.4794	0.2769	Jiangjin	0.1712	0.5900	0.3415
Neijiang	0.1572	0.4625	0.2978	Hechuan	0.1619	0.5722	0.3312
Leshan	0.1329	0.4489	0.2706	Yongchuan	0.1989	0.6812	0.3984
Nanchong	0.1234	0.4553	0.2565	Nanchuan	0.1282	0.4945	0.2675
Meishan	0.0940	0.4104	0.2390	Qijiang	0.1167	0.5857	0.3069
Yibin	0.1136	0.4487	0.2602	Dazu	0.1120	0.6415	0.3178
Guang’an	0.0971	0.4522	0.2515	Bishan	0.1755	0.7200	0.3846
Dazhou	0.0961	0.3740	0.2040	Tongliang	0.1581	0.6778	0.3492
Ya’an	0.1147	0.3844	0.2356	Tongnan	0.1074	0.6103	0.2832
Ziyang	0.0920	0.3881	0.2405	Rongchang	0.1464	0.6778	0.3482
				Kaizhou	0.0782	0.4487	0.2175
				Liangping	0.1048	0.5242	0.2453
				Fengdu	0.0635	0.4821	0.2081
				Dianjiang	0.0922	0.5123	0.2520
				Zhongxian	0.0839	0.5045	0.2305
				Yunyang	0.0565	0.4661	0.1872
Average value^②	0.1417	0.4742	0.2869	Average value^②	0.1421	0.5929	0.3180

Average value^① refers to the 20-year average of the synergistic level of each city between 2001 and 2020. Average value^② refers to the average synergistic level of all cities in the Chengdu metropolitan area and Chongqing metropolitan area in 2001 and 2020, as well as the average synergistic level from 2001 to 2020.

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