tokens: ACKNOWLEDGEMENTS JC thanks the Science and Technology Facilities Council and the Royal Astronomical Society for their financial support. DA thanks the Royal Society, and the International Space Science Institute ( ISSI ) for its support. ND is supported by a Vidi grant from the Dutch Organisation for Scientific Research (NWO). TB acknowledges financial contribution from the agreement ASI-INAF n.2017-14-H.0 between Istituto Nazionale di Astrofisica (INAF) and the Agenzia Spaziale Italiana (ASI). The authors acknowledge the use of astropy (Astropy Collaboration et al. 2013 ), numpy (Jones et al. 2001 ), and matplotlib (Hunter 2007 ) libraries for python . We also acknowledge the use of public data from the RXTE (Bradt et al. 1993 ) archive, as well as FTOOLS (Blackburn 1995 ) for data manipulation. Results provided by the ASM/ RXTE teams at MIT and at the RXTE Science Operations Facility and Guest Observer Facility at NASA’s Goddard Space Flight Centre.
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