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tokens: E.Z. and J.H. acknowledge support from NASA grant NNX16AG83G. R.K. was partially supported by the Max-Planck/Princeton Center for Plasma Physics and NSF grant AST-1517638. This work was also carried out as part of the IBEX mission, which is part of NASA’s Explorer program. The work reported in this paper was performed at the TIGRESS High Performance Computing Center at Princeton University, which is jointly supported by the Princeton Institute for Computational Science and Engineering and the Princeton University Office of Information Technology’s Research Computing department.