tokens: This work was supported in part by the Specialized Research Fund for State Key Laboratories, NSFC under grants 41874201, 41531071, 11873018, 11790302, and 11761131007. We thank the STEREO /PLASTIC team and NASA’s CDAWeb for making these data available. The authors also would like to thank Drs. L. Xiang, Y. F. Hao, and H. Y. Sun for their useful suggestions and discussions.
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