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tokens: ALS acknowledges support from NOVA (Nederlandse Onderzoekschool voor Astronomie). We thank Adam Ingram, Lucy Heil, Victoria Grinberg, Michiel van der Klis, and the participants of ‘The X-ray Spectral-Timing Revolution’ Lorentz Center workshop (2016 February) for useful discussions that contributed to the development of this paper. We also thank the anonymous referee for their helpful comments. This research has made use of data and software provided by the HEASARC; NASA's Astrophysics Data System Bibliographic Services; Numpy v1.9.3 and Scipy v0.16.0 (Jones et al. 2001 ); Astropy v1.0.4 (Astropy Collaboration et al. 2013 ); Matplotlib v1.4.3 (Hunter 2007 ); ipython v3.2.0 (Perez Granger 2007 ); and the AstroBetter wiki.