1. TAPIR, Mailcode 350-17, California Institute of Technology, Pasadena, CA 91125, USA
2. Department of Astronomy and Theoretical Astrophysics Center, University of California Berkeley, Berkeley, CA 94720, USA
3. Department of Physics, University of Connecticut, 196 Auditorium Road, U-3046, Storrs, CT 06269-3046, USA
4. Center for Computational Astrophysics, Flatiron Institute, New York, NY 10011, USA
5. CIERA and Department of Physics & Astronomy, Northwestern University, Evanston, IL 60208, USA