1. NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA
2. School of Physics and Astronomy, Cardiff University, Queens Buildings, The Parade, Cardiff CF24 3AA, United Kingdom
3. Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
4. NASA Headquarters, Washington, DC 20546, USA
5. Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
6. Department of Physics, Villanova University, Villanova, Pennsylvania 19085, USA
7. University of Maryland, College Park, Maryland 20742, USA
8. Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
9. National Institute of Standards and Technology, Boulder, Colorado 80305, USA
10. Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, Stanford, California 94305, USA
11. Department of Physics, Stanford University, Stanford, California 94305, USA
12. SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
13. Sigma Space, a Subsidiary of Hexagon US Federal, Lanham, Maryland 20706, USA
14. GST, Inc., Greenbelt, Maryland 20770, USA
15. ATA Aerospace, Greenbelt, Maryland 20770, USA