tokens: ACKNOWLEDGEMENTS In this study, we make use of the numpy, scipy (Jones et al. 2001 ), and Astropy (Astropy Collaboration 2013 ) for python . The figures in this paper were produced using matplotlib (Hunter 2007 ) and inkscape ( https://inkscape.org ). CK and NCS acknowledge support by the Science and Technology Facilities Council (STFC), and from STFC grant ST/M001326/1. MK is funded by a Newton International Fellowship from the Royal Society. PS acknowledges support by the National Science Foundation (NSF) grant AST-1514737.
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