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tokens: S.X. acknowledges the support for Program number HST-HF2-51400.001-A provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Incorporated, under NASA contract NAS5-26555. S.X. also thanks Chris McKee for useful conversations. S.J. acknowledges the support from the Sherman Fairchild Fellowship at Caltech. A.L. acknowledges the support from grant NSF DMS 1622353. Simulations were performed on Blue Waters supercomputer at NCSA, under the allocation PRAC NSF.1713353 supported by NSF. We have made use of NASA’s Astrophysics Data System and the yt astrophysics analysis software suite (Turk et al. 2010 ).