tokens: We thank the collaboration of Richard Saxton to the correction of the pile-up in the EPIC-pn camera, and fruitful conversations with Jordi José. This work is based on observations obtained with XMM-Newton , an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA. G.S. acknowledges support from the Faculty of the European Space Astronomy Centre (ESAC) and the Max-Planck-Institut für extraterrestrische Physik (MPE). We acknowledge the support of the Spanish MINECO grants AYA2014-59084-P (G.S.) and ESP2015-66134-R (M.H.), and the Generalitat de Catalunya grants SGR0038/2014 (G.S.) and SGR 1458/2014 (M.H.).
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