1. Center for Computational Astrophysics, Flatiron Institute, 162 5th Avenue, New York, NY 10010, USA
2. Department of Physics, eXtreme Gravity Institute, Montana State University, Bozeman, MT 59717, USA
3. Department of Physics and Astronomy, The University of Mississippi, University, MS 38677-1848, USA
4. CENTRA, Departamento de Física, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais 1, P-1049 Lisboa, Portugal