The National Radio Astronomy Observatory is operated by AUI, Inc. under a cooperative agreement with the US National Science Foundation. IRAM is operated by CNRS (France), the MPG (Germany) and the IGN (Spain). We owe the staff at IRAM (Grenoble) and the Plateau de Bure our thanks for their assistance in taking the data.
© European Southern Observatory (ESO) 2000
Online publication: June 20, 2000