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tokens: ACKNOWLEDGEMENTS We thank D. González Caniulef for helpful discussions. SWKE acknowledges support from the Science and Technology Facilities Council (STFC; grant number ST/N504488/1). MJP acknowledges support from STFC (grant number ST/N000811/1). MJP, AAB, and NPMK acknowledge support from the United Kingdom Space Agency (UKSA; grant number ST/P002323/1). This research has made use of data from the High Energy Astrophysics Science Archive Research Center (HEASARC) and the UK Swift Science Data Centre, provided by NASA’s Goddard Space Flight Center and the Department of Physics and Astronomy, Leicester University, UK, respectively.