tokens: The results reported in this article are based in part on data obtained from the Chandra X-ray Observatory (NASA) Data Archive and from the Data Archive of XMM–Newton , an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA. EC, IK, RS acknowledge partial support by grant No. 14-22-00271 from the Russian Scientific Foundation. GP acknowledges support by the German BMWI/DLR (FKZ 50 OR 1408 and FKZ 50 OR 1604) and the Max Planck Society.
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