1. School of Physics and Astronomy, Cardiff University, The Parade, Cardiff, CF24 3AA, UK
2. UK Astronomy Technology Centre, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK
3. Sterrenkundig Observatorium, Universiteit Gent, Krijgslaan 281 S9, B-9000 Gent, Belgium
4. Institute for Astronomy, University of Edinburgh, Royal Observatory, Edinburgh EH9 3HJ, UK
5. Astrophysics Group, Imperial College, Blackett Laboratory, Prince Consort Road, London SW7 2AZ, UK
6. Institut für Astrophysik, Universität Wien, Türkenschanzstrabe 17, A-1180 Wien, Austria
7. Instituto de Astrofísica de Canarias (IAC), E-38205 La Laguna, Tenerife, Spain
8. Dpto. Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Tenerife, Spain
9. INAF – Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, I-35122 Padova, Italy
10. School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
11. CAPES Foundation, Ministry of Education of Brazil, 70040-020 Brasília, DF, Brazil
12. European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching bei München, Germany
13. Department of Physical Science, The Open University, Milton Keynes MK7 6AA, UK
14. Astronomical Observatory Institute, Faculty of Physics, Adam Mickiewicz University, ul. Słoneczna 36, PL-60-286 Poznań, Poland
15. UPMC Univ. Paris 06, UMR7095, Institut d’Astrophysique de Paris, F-75014 Paris, France
16. CNRS, UMR7095, Institut d’Astrophysique de Paris, F-75014 Paris, France
17. Centre for Extragalactic Astronomy, Department of Physics, Durham University, South Road, Durham, DH1 3LE, UK
18. Leiden Observatory, Leiden University, PO Box 9513, NL-2300 RA Leiden, the Netherlands
19. Purple Mountain Observatory/Key Lab of Radio Astronomy, Chinese Academy of Sciences, Nanjing 210008, China
20. Institut d’Astrophysique Spatiale, CNRS, Univ. Paris-Sud, Université Paris-Saclay, Bât. 121, F-91405 Orsay Cedex, France
21. Graduate University of the Chinese Academy of Sciences, 19A Yuquan Road, Shijingshan District, Beijing 10049, China