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tokens: Acknowledgements This work has been partially supported through financial contribution from PRIN INAF 2014. The results are based on observations obtained with XMM–Newton , an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA, and on data obtained from the HEASARC archive. PE acknowledges funding in the framework of the NWO Vidi award A.2320.0076. EC acknowledges support from a VIDI grant from the Netherlands Organisation for Scientific Research (NWO). We thank Daniele Viganò who developed part of the software used in this work.