1. Department of Physics and Astronomy, Università degli Studi di Padova , Vicolo dell’Osservatorio 3, I-35122, Padova , Italy
2. INAF - Osservatorio Astronomico di Padova , Vicolo dell’Osservatorio 5, I-35122, Padova , Italy
3. Instituto de Astrofísica de Canarias , Calle Via Láctea s/n, E-38205, La Laguna, Tenerife , Spain
4. Departamento de Astrofísica, Universidad de La Laguna , E-38206, La Laguna, Tenerife , Spain
5. Department of Physics and Astronomy, University of the Western Cape , Robert Sobukwe Rd, 7535 Bellville, Cape Town , South Africa
6. Inter-university Institute for Data Intensive Astronomy, Department of Physics and Astronomy, University of the Western Cape , 7535 Bellville, Cape Town , South Africa
7. Inter-university Institute for Data Intensive Astronomy, Department of Astronomy, University of Cape Town , 7701 Rondebosch, Cape Town , South Africa
8. INAF - Istituto di Radioastronomia , via Gobetti 101, I-40129 Bologna , Italy
9. School of Physics, H.H. Wills Physics Laboratory, Tyndall Avenue, University of Bristol , Bristol, BS8 1TL , UK
10. Faculty of Physics, Ludwig-Maximilians-Universität , Scheinerstr. 1, D-81679 Munich , Germany
11. Oxford Astrophysics, Denys Wilkinson Building, University of Oxford , Keble Rd, Oxford, OX1 3RH , UK
12. Department of Astronomy, University of Cape Town , Private Bag X3, Rondebosch 7701 , South Africa
13. South African Radio Astronomy Observatory , 2 Fir Street, Black River Park, Observatory, 7925 , South Africa
14. International Centre for Radio Astronomy Research (ICRAR), University of Western Australia , 35 Stirling Highway, Crawley, WA 6009 , Australia
15. ARC Centre of Excellence for All-Sky Astrophysics in 3 Dimensions (ASTRO 3D) , Australia
16. University Observatory, Faculty of Physics, Ludwig-Maximilians-Universität , Scheinerstr. 1, D-81679 München , Germany
17. Sterrenkundig Observatorium, Universiteit Gent , Krijgslaan 281 S9, 9000 Gent , Belgium
18. School of Science, Western Sydney University , Locked Bag 1797, Penrith, NSW 2751 , Australia
19. CSIRO, Space and Astronomy , PO Box 1130, Bentley, WA, 6102 , Australia
20. Aix Marseille Univ, CNRS, CNES, LAM , Marseille 13013 , France
21. Laboratory for Multiwavelength Astrophysics, School of Physics and Astronomy, Rochester Institute of Technology , 84 Lomb Memorial Drive, Rochester, NY 14623 , USA
22. Max Planck Institute for Extraterrestrial Physics , Giessembachstrasse 1, D-857498, Garching , Germany
23. National Radio Astronomy Observatory , 1003 Lopezville Road, Socorro, NM 87801 , USA