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tokens: This work made use of data from the NuSTAR mission, a project led by the California Institute of Technology, managed by the Jet Propulsion Laboratory, and funded by the National Aeronautics and Space Administration. We thank the NuSTAR Operations, Software and Calibration teams for support with the execution and analysis of these observations. This research has made use of the NuSTAR Data Analysis Software (NuSTARDAS) jointly developed by the ASI Science Data Center (ASDC, Italy) and the California Institute of Technology (USA). G.Y. acknowledges support from NASA under NuSTAR Guest Observer cycle-2, proposal number 15-NUSTAR215-0024. L.C.H. was supported by the National Key RD Program of China (2016YFA0400702) and the National Science Foundation of China (11473002, 11721303). Y.T. is supported by JSPS Grants-in-Aid for Scientific Research 15H02070 and 16K05296. F.G.X. and F.Y. are supported in part by National Key RD Program of China (grants 2016YFA0400804 and 2016YFA0400704), the Natural Science Foundation of China (grants 11873074, 11573051, 11633006, 11650110427, 11661161012, 11303008, and 11473002), and the Key Research Program of Frontier Sciences of CAS (grants QYZDJSSW-SYS008 and QYZDB-SSW-SYS033). F.G.X. is also supported by the Youth Innovation Promotion Association of CAS (ID. 2016243) and the Natural Science Foundation of Shanghai (No. 17ZR1435800). We thank the referee for a concise and thorough reading of the manuscript that led to an improved version of the article.