| Institution: | University of Manchester, Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL,; National Radio Astronomy Observatory, PO Box 2, Green Bank, WV 24944, USA,; Columbia Astrophysics Laboratory, Columbia University, 550 West 120th Street, New York, NY 10027, USA,; Australia Telescope National Facility, CSIRO, PO Box 76, Epping NSW 1710, Australia,; Osservatorio Astronomico di Bologna, via Ranzani 1, 40127 Bologna, Italy,; Cagliari Astronomical Observatory, Loc. Poggio dei Pini, Strada 54, 09012 Capoterra (Ca), Italy,; Massachusetts Institute of Technology, Center for Space Research, 70 Vassar Street, Cambridge, MA 02139, USA and; Physics Department, McGill University, 3600 University Street, Montreal, Quebec H3A 2T8, Canada |
