Affiliation: | Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, 85741 Garching, Germany;Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 22, Japan;Institute of Astronomy, Madingley Road, Cambridge CB3 0HA;Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802, USA |