tokens: AZ acknowledges funding from the European Research Council under the European Union's Seventh Framework Programme (FP/2007-2013)/ERC Grant Agreement no. 617001. NDK acknowledges partial support by the ‘RoboPol’ project, which is implemented under the ‘ARISTEIA’ Action of the ‘Operational Program Education and Lifelong Learning’ and is co-funded by the European Social Fund (ESF) and National Resources. This research has made use of NASA's Astrophysics Data System. This research has made use of data and/or software provided by the High Energy Astrophysics Science Archive Research Center (HEASARC), which is a service of the Astrophysics Science Division at NASA/GSFC and the High Energy Astrophysics Division of the Smithsonian Astrophysical Observatory.
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