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tokens: ACKNOWLEDGEMENTS The authors thank Charlie Conroy for useful discussions and for providing comments on a draft of this paper. We thank Steve Finkelstein, Fred Davies, and Brad Greig for useful discussions and for providing: the model from Finkelstein et al. ( 2019 ), and posteriors from Davies et al. ( 2018 ) and Greig et al. ( 2019 ), respectively. We thank Austin Hoag for sharing the posterior from Hoag et al. ( 2019 ). CAM acknowledges support by NASA Headquarters through the NASA Hubble Fellowship grant HST-HF2-51413.001-A awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS5-26555. RPN gratefully acknowledges an Ashford Fellowship and Peirce Fellowship granted by Harvard University. ST is supported by the Smithsonian Astrophysical Observatory through the CfA Fellowship. JL is supported by an NSF Astronomy and Astrophysics Postdoctoral Fellowship under award AST-1701487. Software : ipython (Pérez Granger 2007 ), matplotlib (Hunter 2007 ), numpy (Van Der Walt, Colbert Varoquaux 2011 ), scipy (Oliphant 2007 ), astropy (Robitaille et al. 2013 ), dynesty (Speagle 2019 ).