1. Department of Physics 4-181 CCIS, University of Alberta, Edmonton, AB T6G 2E1, Canada
2. Max Planck Institute for Radio Astronomy, Auf dem Hügel 69, D-53121 Bonn, Germany
3. Department of Physics, Kavli Institute for Astrophysics & Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
4. PITT PACC, Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USA
5. Instituto de Astrofísica de Andalucía, CSIC, Apartado de correos 3004, E-18080 Granada, Spain
6. Instituto de Astronomía, Universidad Nacional Autonóma de México, A.P. 70-264, 04510 México, D.F., Mexico
7. Departamento de Física Teórica y del Cosmos, Universidad de Granada, Campus de Fuentenueva, E-18071 Granada, Spain
8. Instituto Carlos I de Física Teórica y Computacional, Universidad de Granada, E-18071 Granada, Spain
9. Instituto de Astrofísica de Canarias, Calle Vía Láctea s/n, E-38205 La Laguna, Tenerife, Spain
10. Departamento de Astrofísica, Universidad de La Laguna, E-38200 La Laguna, Tenerife, Spain
11. School of Physics and Astronomy, University of St. Andrews, SUPA, North Haugh, St. Andrews, KY16 9SS, UK
12. Departamento de Astrofísica y CC. de la Atmósfera, Universidad Complutense de Madrid, E-28040 Madrid, Spain
13. Dipartimento di Fisica e Astronomia ‘G. Galilei’, Universitá di Padova, vicolo dell'Osservatorio 3, I-35122 Padova, Italy
14. Department of Physics, Institute for Astronomy, ETH Zürich, CH-8093 Zürich, Switzerland
15. Finnish Centre for Astronomy with ESO (FINCA), University of Turku, Väisäläntie 20, FI-21500 Kaarina, Finland
16. Sydney Institute for Astronomy, School of Physics A28, University of Sydney, NSW 2006, Australia