1. Physics Institute, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland
2. Leiden Observatory, Leiden University, PO Box 9513, 2300 RA Leiden, The Netherlands
3. Yale-NUS College, #01-220, 16 College Avenue West, 138527, Singapore
4. Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse, UPS-OMP, CNRS,
CNES, 9 av. du Colonel Roche, 31028 Toulouse Cedex 4, France
5. Institute of Astronomy, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Grudziadzka 5, 87-100 Torun, Poland
6. European Southern Observatory, Karl-Schwarzschild-Strasse 2, 85748 Garching bei München, Germany
7. Laboratory for Astrophysics, Leiden Observatory, Leiden University, PO Box 9513, 2300 RA Leiden, The Netherlands
8. Centre for Star and Planet Formation, Niels Bohr Institute & Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5-7, 1350 Copenhagen K, Denmark
9. Departments of Chemistry and Astronomy, University of Virginia, Charlottesville, Virginia 22904, United States
10. Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Colorado 80303, United States
11. Department of Chemistry, University of Colorado, Boulder, Colorado 80309, United States
12. Institute for Modeling Plasma, Atmospheres, and Cosmic Dust (IMPACT), University of Colorado, Boulder, Colorado 80303, United States