Figure 4

Fitted annual regression models to δ18O for precipitation (e) and river water (a–d) during 2018–2019. (f) is the fitted annual regression models to δ18O for precipitation at Chengdu City during 1996–1997.
Fitted annual regression models to δ18O for precipitation (e) and river water (a–d) during 2018–2019. (f) is the fitted annual regression models to δ18O for precipitation at Chengdu City during 1996–1997.