ner_tags: O O O B-Person I-Person O O O O O O O O O O O O O O O O O O O B-Organization B-Grant O O O O O O O O B-Grant I-Grant I-Grant I-Grant O O O B-Organization I-Organization I-Organization I-Organization B-Grant I-Grant I-Grant O O O O O O B-Organization I-Organization I-Organization B-Organization B-Organization O B-Grant O B-ComputingFacility O O O B-Organization I-Organization I-Organization I-Organization I-Organization B-Organization B-Person O O O O B-Grant I-Grant I-Grant B-Grant I-Grant I-Grant I-Grant I-Grant O O O O O O O O O O B-ComputingFacility I-ComputingFacility I-ComputingFacility O B-Organization I-Organization B-Grant O B-Grant
tokens: Acknowledgements We thank Thomas Tauris for his very useful comments. This work was supported in part by the National Science Foundation under Grant No. NSF PHY11-25915. This research has partially been funded by the Interuniversity Attraction Poles Programme initiated by the Belgian Science Policy Office (IAP P7/08 CHARM). It further was supported by the Netherlands Research Council NWO (NWO grant \#621.016.701 for LGM-II) and by the Netherlands Research School for Astronomy (NOVA). SdM acknowledges support by a Marie Sklodowska-Curie Action (H2020 MSCA-IF-2014, project id 661502). Part of the numerical computations were carried out on the Little Green Machine at Leiden University (612.071.305 and 621.016.701).