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tokens: Acknowledgments We would like to thank our referee, Roberto Soria, for useful comments on this paper. We gratefully acknowledge support from the Science and Technology Facilities Council (HE through studentship grant ST/K501979/1 and TR as part of consolidated grant ST/L00075X/1). The scientific results reported in this paper are based on data obtained from the Chandra Data Archive, and on archival observations obtained with XMMNewton , an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA.