1. Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK
2. LESIA, Observatoire de Paris, CNRS, PSL Research University, Sarbonne Universite, Universite de Paris, Meudon, F-92190, France
3. Inter-University Institute for Data Intensive Astronomy, Department of Astronomy, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa
4. Department of Physics, Astrophysics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK
5. South African Radio Astronomy Observatory, 2 Fir Street, Black River Park, Observatory, Cape Town 7925, South Africa
6. Department of Astrophysics/IMAPP, Radboud University, PO Box 9010, NL-6500 GL Nijmegen, the Netherlands
7. South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa
8. Department of Physics and Electronics, Rhodes University, PO Box 94, Makhanda 6140, South Africa
9. Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
10. Department of Physics, The George Washington University, 725 21st Street NW, Washington, DC 20052, USA
11. Astronomy, Physics, and Statistics Institute of Sciences (APSIS), 725 21st Street NW, Washington, DC 20052, USA
12. Department of Astronomy, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa
13. IAU Office of Astronomy for Development, Cape Town 7935, South Africa
14. International Centre for Radio Astronomy Research – Curtin University, GPO Box U1987, Perth, WA 6845, Australia
15. National Radio Astronomy Observatory, Socorro, NM 87801, USA
16. Caltech, 1200 E. California Blvd. MC 249-17, Pasadena, CA 91125, USA
17. Anton Pannekoek Institute, University of Amsterdam, Postbus 94249, NL-1090 GE Amsterdam, the Netherlands
18. Netherlands Institute for Radio Astronomy (ASTRON), Oude Hoogeveensedijk 4, NL-7991 PD Dwingeloo, the Netherlands