1. Center for Computational Astrophysics, Flatiron Institute , 162 Fifth Avenue, New York, NY 10010, USA
2. Center for Astrophysics, Harvard and Smithsonian , 60 Garden St. Cambridge, MA 02138, USA
3. Institute for Astronomy, University of Edinburgh , Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK
4. UK Astronomy Technology Centre , Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK
5. Centre for Astrophysics Research, University of Hertfordshire , College Lane, Hatfield AL10 9AB, UK
6. Leiden Observatory, Leiden University , PO Box 9513, NL-2300 RA Leiden, the Netherlands
7. INAF-IRA , Via P. Gobetti 101, I-40129 Bologna, Italy
8. Thüringer Landessternwarte , Sternwarte 5, D-07778 Tautenburg, Germany
9. CSIRO Space and Astronomy , ATNF, PO Box 1130, Bentley WA 6102, Australia