tokens: We thank the referee for providing a helpful report. We also thank Taysun Kimm, Chris Matzner, and Jim Stone for helpful comments and suggestions on the manuscript. This work was supported by Grants No. AST-1312006 and PHY-1144374 from the National Science Foundation. MAS is supported by the Max-Planck/Princeton Center for Plasma Physics. Part of this project was conducted during a visit to the KITP at U.C. Santa Barbara, which is supported by the National Science Foundation under Grant No. PHY-1125915. Simulations were performed on the computational resources supported by the PICSciE TIGRESS High Performance Computing Center at Princeton University.
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