1. Department of Astronomy, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa
2. Astrophysics, Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH, UK
3. Department of Physics and Electronics, Rhodes University, PO Box 94, Makhanda 6140, South Africa
4. South African Radio Astronomy Observatory, 2 Fir Street, Black River Park, Observatory, Cape Town 7925, South Africa
5. Inter-University Institute for Data Intensive Astronomy, and Department of Physics and Astronomy, University of the Western Cape, Robert Sobukwe Road, 7535 Bellville, Cape Town, South Africa
6. Department of Physics and Astronomy, University of the Western Cape, Robert Sobukwe Road, 7535 Bellville, Cape Town, South Africa
7. CEA, IRFU, DAp, AIM, Université Paris-Saclay, Université de Paris, CNRS, F-91191 Gif-sur-Yvette, France
8. INAF – Osservatorio Astronomico di Brera, via Brera 28, I-20121 Milano, Italy
9. Centre for Astrophysics Research, Department of Physics, Astronomy and Mathematics, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK
10. CSIRO Astronomy and Space Science, PO Box 1130, Bentley, WA 6102, Australia
11. Instituto de Astrofísica e Ciências do Espaço, Universidade de Lisboa, OAL, Tapada da Ajuda, P-1349-018 Lisboa, Portugal
12. Departamento de Física, Faculdade de Ciências, Universidade de Lisboa, Edifício C8, Campo Grande PT1749-016 Lisbon, Portugal
13. Purple Mountain Observatory and Key Laboratory for Radio Astronomy, Chinese Academy of Sciences, 8 Yuanhua Road, 210034, Nanjing, China
14. School of Astronomy and Space Science, University of Science and Technology of China, Hefei, Anhui, 230026, China
15. Dipartimento di Fisica e Astronomia, Universitá di Bologna, via P. Gobetti 93/2, I-40129 Bologna, Italy
16. INAF, Istituto di Radioastronomia, Via Gobetti 101, I-40129 Bologna, Italy
17. Hamburger Sternwarte, University of Hamburg, Gojenbergsweg 112, D-21029 Hamburg, Germany
18. The Inter-University Institute for Data Intensive Astronomy (IDIA), Department of Astronomy, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa
19. School of Science, Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia
20. Faculty of Physics, Ludwig-Maximilians-Universität, Scheinerstr 1, D-81679 Munich, Germany
21. Centre for Extragalactic Astronomy, Department of Physics, Durham University, Durham DH1 3LE, UK
22. South African Astronomical Observatory, PO Box 9, Observatory 7935, Cape Town, South Africa
23. National Radio Astronomy Observatory, 1003 Lopezville Road, Socorro, NM 87801, USA
24. A&A, Department of Physics, Faculty of Sciences, University of Antananarivo, B.P. 906, Antananarivo 101, Madagascar
25. Department of Physics, University of Pretoria, Private Bag X20, Hatfield 0028, South Africa
26. International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia
27. GEPI, Observatoire de Paris, CNRS, Université Paris Diderot, 5 place Jules Janssen, F-92190 Meudon, France
28. Centre for Radio Astronomy Techniques and Technologies, Department of Physics and Electronics, Rhodes University, Grahamstown 6140, South Africa
29. USN, Observatoire de Paris, CNRS, PSL, UO, Nançay, 18330, France