ner_tags: O O O B-Person I-Person B-Person I-Person O B-Person I-Person O O O O O O O O O O O O B-Software O B-URL O B-Citation I-Citation O O B-Model I-Model O O O O B-Software B-Citation I-Citation O B-Person O O O O B-Fellowship I-Fellowship I-Fellowship I-Fellowship I-Fellowship I-Fellowship I-Fellowship
tokens: ACKNOWLEDGEMENTS We thank Henrik Latter, Eugene Vasiliev, and Antranik Sefilian for useful conversations. The orbit integration in Section 7 was done using galpy ( http://github.com/jobovy/galpy ; Bovy 2015 ). The N -body calculations were done with mercury (Chambers 1999 ). CH is funded by a Science and Technology Facilities Council (STFC) studentship.