1. UK Astronomy Technology Centre, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK
2. Institute for Astronomy, University of Edinburgh, Blackford Hill, Edinburgh EH9 3HJ, UK
3. Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, UK
4. The Open University, Walton Hall, Kents Hill, Milton Keynes MK7 6AA, UK
5. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
6. SOFIA-USRA, NASA Ames Research Center, MS 232-12, Moffett Field, CA 94035, USA
7. European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748 Garching b. München, Germany
8. Academia Sinica, Institute of Astronomy and Astrophysics, Taipei 10617, Taiwan
9. Department of Physics & Astronomy, University of California Los Angeles, Los Angeles, CA 90095, USA