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tokens: ACKNOWLEDGEMENTS The authors would like to thank Sean Fillingham, Michael Cooper, Alex Drlica-Wagner, Denis Erkal, and Josh Simon for useful discussions. TK and JSB were supported by NSF AST-1518291, HST-AR-14282, and HST-AR-13888. MBK acknowledges support from NSF grant AST-1517226 and CAREER grant AST-1752913 and from NASA grants NNX17AG29G and HST-AR-13888, HST-AR-13896, HST-AR-14282, HST-AR-14554, HST-AR-15006, HST-GO-12914, and HST-GO-14191 from the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS5-26555. Support for SGK was provided by NASA through the Einstein Postdoctoral Fellowship grant number PF5-160136 awarded by the Chandra X-ray Center, which is operated by the Smithsonian Astrophysical Observatory for NASA under contract NAS8-03060. MSP acknowledges that support for this work was provided by NASA through Hubble Fellowship grant #HST-HF2-51379.001-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. AGS was supported by an AGEP-GRS supplement to NSF grant AST-1009973. Numerical business was taken care of in a flash using computational resources of the Texas Advanced Computing Center (TACC; http://www.tacc.utexas.edu ), the NASA Advanced Supercomputing (NAS) Division and the NASA Center for Climate Simulation (NCCS), and the Extreme Science and Engineering Discovery Environment (XSEDE), which is supported by National Science Foundation grant number OCI-1053575. This work also made use of Astropy, 6 a community-developed core python package for Astronomy (Astropy Collaboration 2013 , 2018 ), matplotlib (Hunter 2007 ), numpy (van der Walt, Colbert Varoquaux 2011 ), scipy (Jones et al. 2001 ), ipython (Perez Granger 2007 ), pandas (McKinney 2010 ), mayavi (Ramachandran Varoquaux 2011 ), and the NASA Astrophysics Data System.