1. Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA.
2. Joint Institute for Laboratory Astrophysics, University of Colorado, and National Institute of Standards and Technology, Boulder, CO 80309-0440, USA.
3. University of Texas—Austin, McDonald Laser Ranging Operations, McDonald Observatory/Astronomy, Austin, TX 78712-1083, USA.
4. OCA/CERGA, Avenue Copernic, Grasse F-06130, France
5. McDonald Observatory, Fort Davis, TX 79734, USA.