1. Department of Physics, University of Alberta , Edmonton, AB T6G 2E1 , Canada
2. Sub-department of Astrophysics, Department of Physics, University of Oxford , Keble Road, Oxford OX1 3RH , UK
3. Center for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138 , USA
4. Raytheon , 1151 E Hermans Road, Tucson, AZ 85756 , USA
5. Steward Observatory, University of Arizona , 933 N Cherry Avenue, Tucson, AZ 85719 . USA
6. Sterrenkundig Observatorium, Universiteit Gent , Krijgslaan 281 S9, B-9000 Gent , Belgium
7. Department of Astronomy, University of Washington , Box 351580, Seattle, WA 98195-1580 , USA
8. Center for Computational Astrophysics, Flatiron Institute , 162 Fifth Avenue, New York, NY 10010 , USA
9. Department of Astronomy, University of Florida , PO Box 112055, Gainesville, FL 32611-2055 , USA
10. Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA) and Department of Physics and Astronomy, Northwestern University , 1800 Sherman Avenue, Evanston, IL 60201 , USA
11. Department of Astronomy, The Ohio State University , 140 West 18th Avenue, Columbus, OH 43210 , USA
12. Center for Cosmology and Astroparticle Physics , 191 West Woodruff Avenue, Columbus, OH 43210 , USA
13. Department of Astronomy and Astrophysics, University of California San Diego , 9500 Gilman Drive, San Diego, CA 92093 , USA
14. Department of Physics, The Ohio State University , Columbus, OH 43210 , USA