tokens: We thank K. S. Cheng, C. W. Ng, K. L. Li, J. Takata, and A. K. H. Kong for valuable discussion. We acknowledge the use of data and software facilities from the FSSC, managed by the HEASARC at the Goddard Space Flight Center. This work is supported by the National Natural Science Foundation of China (NSFC) through grants 11633007, 11661161010, and U1731136.
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