ner_tags: O O O B-Person I-Person O O O B-Software O O O B-Person I-Person O O O O O O O O O O O O O O B-Person I-Person B-Person I-Person B-Person I-Person B-Person I-Person O B-Person I-Person O O O O O O B-Person I-Person O O O O O O O O O O
tokens: ACKNOWLEDGEMENTS We thank Volker Springel for access to arepo . We thank Joel Primack for insightful questions about the spin parameter that motivated this project. We also thank Ramesh Narayan, Re’em Sari, Rachel Somerville, James Bullock, and Michael Boylan-Kolchin for enlightening discussions. We also thank Cristina Popa for her help in the early stages of this project.