1. Laboratoire d’astrophysique, École Polytechnique Fédérale de Lausanne (EPFL) , Observatoire, CH-1290 Versoix , Switzerland
2. GEPI, Observatoire de Paris, Université PSL , CNRS, Place Jules Janssen, F-92195 Meudon , France
3. Instituto de Astrofísica de Canarias , E-38205 La Laguna, Tenerife , Spain
4. Universidad de La Laguna, Dept. Astrofísica , E-38206 La Laguna, Tenerife , Spain
5. Max-Planck-Institut für Astronomie , Königstuhl 17, D-69117 Heidelberg , Germany
6. Observatoire astronomique de Strasbourg, Université de Strasbourg, CNRS , UMR 7550, F-67000 Strasbourg , France
7. STFC UK Astronomy Technology Centre, Royal Observatory , Blackford Hill, Edinburgh EH9 3HJ , UK
8. Department of Physics and Astronomy, University of Victoria , PO Box 3055, STN CSC, Victoria, BC V8W 3P6 , Canada
9. Kapteyn Astronomical Institute, University of Groningen , Landleven 12, 9747 AD Groningen , the Netherlands