1. European Southern Observatory; Karl-Schwarzschild-Str. 2; 85748; Garching; Germany
2. Gemini Observatory; Northern Operations Centre; 670 N. A‘ohoku Place; Hilo; HI; 96720; USA
3. Sub-Department of Astrophysics; Department of Physics; University of Oxford; Denys Wilkinson Building, Keble Road; Oxford; OX1 3RH
4. Centre for Astrophysics Research; University of Hertfordshire; Hatfield; Herts; AL1 9AB
5. Physics Department; New Mexico Institute of Mining and Technology; Socorro; NM; 87801; USA
6. Department of Astronomy; University of California; Campbell Hall; Berkeley; CA; 94720; USA
7. Observatoire de Paris; LERMA and CNRS; 61 Av. de l‘Observatoire; F-75014; Paris; France
8. Laboratoire AIM Paris-Saclay; CEA/IRFU/SAp - CNRS - Université Paris Diderot; 91191; Gif-sur-Yvette Cedex; France
9. University of Massachussets Amherst; Amherst; MA; 01003; USA
10. Max-Planck Institut für extraterrestrische Physik; PO Box 1312; D-85478; Garching; Germany
11. Space Telescope European Coordinating Facility; European Southern Observatory; Karl-Schwarzschild-Str. 2; 85748; Garching; Germany
12. Max-Planck-Institut für Astrophysik; Karl-Schwarzschild-Str. 1; 85741; Garching; Germany
13. Centre for Astrophysics & Supercomputing; Swinburne University of Technology; PO Box 218; Hawthorn; VIC; 3122; Australia
14. Netherlands Institute for Radio Astronomy (ASTRON); Postbus 2; 7990; AA Dwingeloo; the Netherlands
15. Dunlap Institute for Astronomy & Astrophysics; University of Toronto; 50 St. George Street; Toronto; ON; M5S 3H4; Canada