Institution: | 1Department of Physics, University of Durham, South Road, Durham DH1 3LE; 2Astronomy Technology Centre, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ; 3Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT; 4Department of Astronomy, Caltech, Pasadena, CA 91125, USA; 5Institute of Astronomy, Madingley Road, Cambridge CB3 0HA; 6Observatoire de Toulouse, 14 avenue E. Belin, 31400 Toulouse, France |