Fig. 4

(a) Spatial distribution of \(\:{\text{R}}_{\text{max-cum}}\) and (b) cumulative months. (the maps are based on the standard map produced under the supervision of the Ministry of Natural Resources of the People’s Republic of China: Approval number GS (2023) 2763, http:/bzdt.ch.mnr.gov.cn/, created by ArcMap, version 10.8, http://www.esri.com/).