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tokens: We would like to thank the reviewer for comments that improved the clarity of the presentation. DF was supported by the DoD SMART Scholarship. TP was partially supported by the NSF grant AST-1109113 and the DOE grant DE-FG52-09NA29548. This research used resources of the National Energy Research Scientific Computing Center, which is supported by the Office of Science of the US Department of Energy under Contract No. DE-AC02-05CH11231, and the Air Force Research Laboratory. The software used in this work was in part developed by the DOE Flash Center at the University of Chicago. The data analysis was performed in part using the yt Project (Turk et al. 2011 ), and VisIt (Childs et al. 2012 ). This research has made use of NASA's Astrophysics Data System Bibliographic Services.