1. Department of Physics University of Alberta Edmonton Alberta Canada
2. School of Physics and Astronomy University of Minnesota Minneapolis MN USA
3. University of Calgary Calgary Alberta Canada
4. Johns Hopkins University Applied Physics Laboratory Laurel MD USA
5. Mullard Space Science Laboratory University College London London UK
6. NASA Goddard Space Flight Center Greenbelt MD USA
7. Department of Physics and Astronomy University of Iowa Iowa City IA USA
8. National Observatory of Athens Athens Greece