Institution: | Institute for Theoretical Physics, University of Zürich, Winterthurerstrasse 190, CH–8057 Zürich, Switzerland;Kapteyn Astronomical Institute, University of Groningen, Postbus 800, 9700 AV Groningen, the Netherlands;Department of Astronomy and Astrophysics, The Pennsylvania State University, 525 Davey Lab, University Park, PA 16802, USA;Royal Greenwich Observatory, Madingley Road, Cambridge CB3 0EZ |