| Affiliation: | National Radio Astronomy Observatory, PO Box O, Socorro, NM 87801, USA;Department of Physics and Astronomy, University of Pennsylvania, 209 S. 33rd Street, Philadelphia, PA 19104-6396, USA;University of Manchester, Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL;Kapteyn Astronomical Institute, Postbus 800, 9700 AA Groningen, the Netherlands;NFRA, Postbus 2, 7990 AA Dwingeloo, the Netherlands;California Institute of Technology, 105-24, Pasadena, CA 91125, USA;Space Telescope Science Institute, Baltimore, MD 21218, USA;Harvard–Smithsonian Center for Astrophysics, 60 Garden Street, MS-51, Cambridge, MA 02138, USA |
