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tokens: ACKNOWLEDGEMENTS We sincerely thank the referee for valuable suggestions on the paper. This research is in part based on the data obtained from the Chandra Data Archive, and has made use of software provided by the Chandra X-ray Center (CXC) in the application packages ciao, ChIPS , and Sherpa . This research has used observations obtained with XMM–Newton , and the ESA science mission, with instruments and contributions directly funded by ESA Member States and NASA. C-PH and C-YN are supported by a GRF grant from the Hong Kong Government under HKU 17300215P. WCGH acknowledges support from STFC in the UK through Grant No. ST/M000931/1.