1. Department of Physics, University of Connecticut , 196 Auditorium Road, U-3046, Storrs, CT 06269-3046, USA
2. Center for Computational Astrophysics, Flatiron Institute , 162 5th Avenue, New York, NY 10010, USA
3. Harvard-Smithsonian Center for Astrophysics , 60 Garden Street, Cambridge, MA 02138, USA
4. Columbia Astrophysics Laboratory, Columbia University , 550 West 120th Street, New York, NY 10027, USA
5. Department of Astronomy, Van Vleck Observatory, Wesleyan University , 96 Foss Hill Drive, Middletown, CT 06459, USA
6. CIERA and Department of Physics and Astronomy, Northwestern University , 1800 Sherman Avenue, Evanston, IL 60201, USA
7. E. A. Milne Centre for Astrophysics, Department of Physics and Mathematics, University of Hull , Cottingham Road, Hull HU6 7RX, UK
8. DAIM, University of Hull , Cottingham Road, Hull, HU6 7RX, UK
9. Department of Physics and Astronomy , Pomona College, 333 N. College Way, Claremont, CA 91711, USA
10. Department of Astronomy, Columbia University , 550 West 120th Street, New York, NY 10027, USA
11. Black Hole Initiative – Harvard University , 20 Garden Street, Cambridge, MA 02138, USA
12. TAPIR, Mailcode 350-17, California Institute of Technology , Pasadena, CA 91125, USA
13. Department of Astrophysical Sciences , Princeton University, Princeton, NJ 08544, USA
14. Department of Physics, Center for Astrophysics and Space Sciences, University of California San Diego , 9500 Gilman Drive, La Jolla, CA 92093, USA