1. Max-Planck-Institut für extraterrestrische Physik, 85748 Garching, Germany;
2. Departments of Physics and Astronomy, University of California, Berkeley, California 94720, USA
3. School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel
4. Center for Computational Astrophysics, Flatiron Institute, New York, NY 10010, USA