tokens: The research of V.F. and J.H. was supported by NASA grants NNX12AH44G, NNX13AF99G, NNX14AF43G, NNX14AJ53G, and NNX14AP24G, and by NSF grant AGS-0955700. Resources supporting this work were provided by the NASA High-End Computing (HEC) Program through the NASA Advanced Supercomputing (NAS) Division at Ames Research Center. The work of J.N. was supported by Narodowe Centrum Nauki through research project DEC-2013/10/E/ST9/00662. The authors thank P.A. Isenberg, K.-I. Nishikawa, G.P. Zank, and E.J. Summerlin for helpful discussions.
ner_tags: O O O B-Person O B-Person O O O B-Organization B-Grant I-Grant B-Grant B-Grant B-Grant O B-Grant O O B-Organization B-Grant I-Grant O O O O O O O O B-ComputingFacility I-ComputingFacility I-ComputingFacility B-ComputingFacility B-ComputingFacility O O B-ComputingFacility I-ComputingFacility I-ComputingFacility B-ComputingFacility B-ComputingFacility O B-Organization I-Organization I-Organization O O O B-Person O O O B-Organization I-Organization I-Organization O B-Grant I-Grant I-Grant O O O B-Person I-Person B-Person I-Person B-Person I-Person O B-Person I-Person O O O