tokens: ACKNOWLEDGEMENTS DSE acknowledges the financial support of the Science and Technology Facilities Council through a studentship award. We would like to thank the anonymous referee for constructive comments that helped to improve this paper as well as Jose Oñorbe, Tilman Hartwig, Bhaskar Agarwal, and Marta Volonteri for their useful discussions and comments. This research made use of astropy , a community-developed core python package for Astronomy (Astropy Collaboration 2013 ).
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