1. School of Physics and Astronomy, Cardiff University, Queen’s Building, The Parade, Cardiff CF24 3AA, Wales, UK
2. ASTRON, the Netherlands Institute for Radio Astronomy, Oude Hoogeveensedijk 4, NL-7991 PD Dwingeloo, The Netherland
3. Faculty of Physics, Ludwig-Maximilians-Universität, Scheinerstr. 1, D-81679 Munich, Germany
4. UK ALMA Regional Centre Node, Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Oxford Road, Manchester M13 9PL, UK
5. Kapteyn Astronomical Institute, University of Groningen, PO Box 72, NL-9700 AB Groningen, The Netherlands
6. INAF-Astronomical Observatory of Capodimonte, via Moiariello 16, Naples I-80131, Italy
7. Astronomy Research Unit, University of Oulu, FI-90014 Oulu, Finland
8. Sterrenkundig Observatorium, Department of Physics and Astronomy, Universiteit Gent, Krijgslaan 281 S9, B-9000 Gent, Belgium
9. Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
10. Sterrenkundig Observatorium, Universiteit Gent, Krijgslaan 281 S9, B-9000 Gent, Belgium
11. Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
12. Observatório do Valongo, Universidade Federal do Rio de Janeiro, Ladeira Pedro Antônio 43, 20080-090 Rio de Janeiro, RJ, Brazil
13. Astronomy Department, Yale University, P.O. Box 208101, New Haven, CT 06520-8101, USA
14. INAF - Osservatorio Astronomico di Cagliari, Via della Scienza 5, I-09047 Selargius (CA), Italy
15. Heidelberg Institute for Theoretical Studies, Schloss-Wolfsbrunnenweg 35, D-69118 Heidelberg, Germany
16. Astronomy Department, Yale University, PO Box 208101, New Haven, CT 06520-8101, USA
17. National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903-2475, USA
18. Physics Department, New Mexico Tech, 801 Leroy Place, Socorro, NM 87801, USA
19. National Radio Astronomy Observatory, Socorro, NM 87801, USA