tokens: We would like to thank the referee for the very helpful comments that helped to improve the manuscript. We thank M. Kühnel and M. Nowak for the useful discussions. DJW and MJM acknowledge support from STFC Ernest Rutherford fellowships. This research has made use of data obtained with NuSTAR , a project led by Caltech, funded by NASA and managed by NASA/JPL, and has utilized the nustardas software package, jointly developed by ASDC (Italy) and Caltech (USA). This research has also made use of data obtained with XMM-Newton , an ESA science mission with instruments and contributions directly funded by ESA Member States. This work has made use of data supplied by the UK Swift Science Data Centre at the University of Leicester, and also of the XRT Data Analysis Software (XRTDAS) developed under the responsibility of the ASI Science Data Center (ASDC), Italy. This research has made use of a collection of ISIS functions (ISISscripts) provided by ECAP/Remeis observatory and MIT ( http://www.sternwarte.uni-erlangen.de/isis/ ).
ner_tags: O O O O O O O O O O O O O O O O O O O O B-Person I-Person O B-Person I-Person O O O O B-Person O B-Person O O O B-Organization B-Fellowship I-Fellowship I-Fellowship O O O O O O O O O B-Telescope O O O O O B-Organization O O B-Organization O O O B-Organization O O O O B-Software I-Software I-Software O O O B-Organization B-Location O B-Organization B-Location O O O O O O O O O O B-Telescope O O B-Organization O O O O O O O O O B-Organization O O O O O O O O O O O O B-Organization I-Organization I-Organization I-Organization I-Organization O O B-Organization I-Organization I-Organization O O O O B-Software I-Software I-Software I-Software B-Software O O O O O O B-Organization I-Organization I-Organization I-Organization B-Organization B-Location O O O O O O O O O B-Software I-Software B-Software O O B-Organization B-Observatory O B-Organization O B-URL O