| Affiliation: | Department of Astronomy, Columbia University, Mail Code 5246, 550 West 120th Street, New York, NY 10027, USA;Netherlands Foundation for Research in Astronomy, Postbus 2, 7990 AA Dwingeloo, the Netherlands;Kapteyn Astronomical Institute, University of Groningen, P.O. Box 800, 9700 AV Groningen, the Netherlands;Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH;Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden, the Netherlands;United States Naval Observatory/NVI, 2212 40th Pl NW #2, Washington, DC 20007, USA;School of Physics, University of Sydney, NSW 2006, Australia |
