1. Theoretical Division, LANL, Los Alamos, NM 87545, USA
2. Karagozian & Case, Inc., Glendale, CA 91203, USA
3. Steward Observatory, University of Arizona, Tucson, AZ 85721, USA
4. Monash Centre for Astrophysics, School of Physics and Astronomy, Monash University, Clayton 3800, Australia
5. Max-Planck-Institut für Astrophysik (MPA), D-85748 Garching, Germany