1. School of Physics and Astronomy, Institute for Astronomy, University of Edinburgh , Royal Observatory, Blackford Hill, EH9 3HJ Edinburgh, UK
2. Sub-Department of Astrophysics, University of Oxford , Keble Road, Oxford OX1 3RH, UK
3. Department of Physics and Astronomy, University of the Western Cape , Robert Sobukwe Road, 7535 Bellville, Cape Town, South Africa
4. Centre for Extragalactic Astronomy, Department of Physics, Durham University , Durham DH1 3LE, UK
5. Institute for Computational Cosmology, Department of Physics , Durham University, Durham DH1 3LE, UK
6. Department of Physics and Electronics, Rhodes University , PO Box 94, Makhanda, 6140, South Africa
7. South African Radio Astronomy Observatory , 2 Fir Street, Black River Park, Observatory, Cape Town, 7925, South Africa
8. Inter-University Institute for Data Intensive Astronomy, University of the Western Cape , Robert Sobukwe Road, 7535 Bellville, Cape Town, South Africa
9. Jodrell Bank Centre for Astrophysics , Alan Turing Building, University of Manchester, Oxford Road, Manchester M13 9PL, UK
10. Instituto de Astrofísica e Ciências do Espaço, Universidade de Lisboa , OAL, Tapada da Ajuda, PT1349-018 Lisboa, Portugal
11. Departamento de Física, Faculdade de Ciências, Universidade de Lisboa , Edifício C8, Campo Grande, PT1749-016 Lisbon, Portugal
12. Purple Mountain Observatory, Chinese Academy of Sciences , Nanjing 210023, China
13. Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, School of Natural Sciences, The University of Manchester , Manchester M13 9PL, UK
14. The Inter-University Institute for Data Intensive Astronomy, Department of Astronomy, University of Cape Town , Private Bag X3, Rondebosch 7701, South Africa
15. School of Science, Western Sydney University , Locked Bag 1797, Penrith, NSW 2751, Australia
16. CSIRO Astronomy and Space Science , PO Box 1130, Bentley, WA 6102, Australia
17. International Centre for Radio Astronomy Research (ICRAR), University of Western Australia , Crawley, WA 6009, Australia
18. South African Astronomical Observatories , P.O. Box 9, Observatory, Cape Town, 7935, South Africa
19. Department of Astronomy, University of Cape Town , Private Bag X3, Rondebosch 7701, South Africa
20. International Centre for Radio Astronomy Research, Curtin University , Bentley, WA 6102, Australia
21. Physics Department, University of Johannesburg , 5 Kingsway Ave, Rossmore, Johannesburg, 2092, South Africa
22. Centre for Astrophysics Research, School of Physics, Astronomy and Mathematics, University of Hertfordshire , College Lane, Hatfield, Hertfordshire AL10 9AB, UK
23. University Observatory, Faculty of Physics, Ludwig-Maximilians-Universität , Scheinerstr. 1, D-81679 Munich, Germany
24. INAF-Istituto di Radioastronomia , Via P. Gobetti 101, 40129 Bologna, Italy
25. National Radio Astronomy Observatory , 520 Edgemont Road, Charlottesville, VA 22903, USA
26. Department of Physics, University of Antananarivo , P.O. Box 906, Antananarivo, Madagascar