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tokens: Resources supporting this work were provided by the NASA High-End Computing (HEC) Program through the NASA Advanced Supercomputing (NAS) Division at Ames Research Center. We thank Tom Quinn and James Wadsley for use of the proprietary code Gasoline , and Charlotte Christensen for help in creating the simulations. The pynbody package (Pontzen et al. 2013 ) was used in portions of this analysis.