Affiliation: | 1. Herzberg Institute of Astrophysics, National Research Council, Ottawa, Canada K1A 0R6;1. Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass. 02138, USA;2. California Institute of Techology, Pasadena, Ca. 91125, USA;3. State University of New York, Stonybrook, L.I., NY 11790, USA |