ner_tags: O O B-Person I-Person O O O O O O O O O O B-Software O O O O O O O O O O O B-Organization O O B-Grant O B-Grant O O B-Organization O O B-Grant O B-Grant O O O O O O O O O O B-Organization I-Organization I-Organization I-Organization I-Organization I-Organization I-Organization
tokens: We thank James Stone for helpful discussions and comments, as well as for making Athena++ publicly available. Financial support for this study has been provided by NSF via grants AST-1409524 and AST-1515763, and by NASA via grants 14-ATP14-0059 and 15-XRP15-2-0139. All simulations were carried out using facilities supported by the Princeton Institute of Computational Science and Engineering.