1. Space Sciences Laboratory, University of California , 7 Gauss Way, Berkeley, CA 94720-7450, USA
2. Department of Astronomy, University of California , Berkeley, CA 94720, USA
3. Department of Physics, University of Nevada , Reno, NV 89557, USA
4. CRESST and X-ray Astrophysics Laboratory, NASA Goddard Space Flight Center , Greenbelt, MD 20771, USA
5. Department of Physics, University of Maryland , Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA
6. NASA Goddard Space Flight Center , Greenbelt, MD 20771, USA
7. Center for Research and Exploration in Space Science and Technology, NASA/GSFC , Greenbelt, Maryland 20771, USA
8. The Catholic University of America , 620 Michigan Avenue, N.E. Washington, DC 20064, USA
9. Université Grenoble Alpes, CNRS, IPAG , F-38000 Grenoble, France
10. Space Research Institute, Russian Academy of Sciences , Profsoyuznaya 84/32, 117997 Moscow, Russia
11. Stonehill College , 320 Washington Street, Easton, MA 02357, USA
12. Columbia Astrophysics Laboratory, Columbia University , New York, NY 10027, USA