tokens: We thank Mary Putman, David Schiminovich, Yong Zheng, and our referee for their useful discussions and thoughtful feedback, which have helped us improve various drafts of this manuscript. Many thanks to Lauren Corlies for sharing her C loudy models used in our mock observations. We acknowledge support from NSF grants AST-1312888, AST-1615955, and DGE-1644869 and NASA grant NNX15AB20G, as well as computational resources from NSF XSEDE and Columbia University’s compute cluster. Simulations were run on the Texas Advanced Computing Center Stampede supercomputer and were performed using the publicly available Enzo code ( http://enzo-project.org ) and analyzed with the yt package (Turk et al. 2011 ). Enzo is the product of a collaborative effort of many independent scientists from numerous institutions around the world. Their commitment to open science has helped make this work possible. The Flatiron Institute is supported by the generosity of the Simons Foundation.
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