1. Jodrell Bank Centre for Astrophysics, Department of Physics & Astronomy, The University of Manchester , Manchester M13 9PL, UK
2. Institute for Astronomy, The University of Edinburgh, Royal Observatory , Edinburgh EH9 3HJ, UK
3. Department of Physics, College of Sciences, Northeastern University , Wenhua Road, Shenyang, 11089, China
4. Department of Physics and Astronomy, University of the Western Cape , Robert Sobukwe Road, Cape Town, 7535, South Africa
5. South African Radio Astronomy Observatory (SARAO) , 2 Fir Street, Cape Town, 7925, South Africa
6. Shanghai Astronomical Observatory, Chinese Academy of Sciences , 80 Nandan Road, Shanghai, 200030, China
7. Dipartimento di Fisica, Università degli Studi di Torino , via P. Giuria 1, I-10125, Torino, Italy
8. INFN - Istituto Nazionale di Fisica Nucleare , Sezione di Torino, via P. Giuria 1, I-10125, Torino, Italy
9. Department of Physics & Astronomy, Queen Mary University of London , London, E1 4NS, UK
10. Higgs Centre for Theoretical Physics, School of Physics and Astronomy, The University of Edinburgh , Edinburgh EH9 3FD, UK
11. Institute of Particle Physics & Astrophysics, Department of Physics, ETH Zurich , 8093 Zurich, Switzerland
12. Centre for Astrophysics & Supercomputing, Swinburne University of Technology , PO Box 218, Hawthorn, VIC 3122, Australia
13. Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto CAUP , Rua das Estrelas, PT4150-762 Porto, Portugal
14. NAOC-UKZN Computational Astrophysics Center (NUCAC), University of Kwazulu-Natal , Durban, 4000, South Africa
15. School of Chemistry and Physics, University of KwaZulu-Natal, Westville Campus , Private Bag X54001, Durban, South Africa