| Affiliation: | University of Manchester, Jodrell Bank Observatory, Macclesfield, Cheshire, SK11 9DL;Kapteyn Astronomical Institute, Postbus 800, NL-9700 AV Groningen, the Netherlands;Department of Physics, University of California, Davis, CA 95616, USA;Joint Institute for VLBI in Europe, Postbus 2, 7990 AA Dwingeloo, the Netherlands;KIPAC, Stanford University, 2575 Sand Hill Road, Menlo Park, CA 94025, USA;ASTRON, Postbus 2, 7990 AA, Dwingeloo, the Netherlands;National Radio Astronomy Observatory, PO Box O, 1003 Lopezville Road, Socorro NM, 87801-0387, USA;California Institute of Technology, Pasadena, CA 91125, USA;Department of Physics and Astronomy, University of Pennsylvania, 209 South 33rd Street, Philadelphia, PA 19104, USA |
