1. Department of Physics, Durham University, South Road, Durham DH1 3LE, UK
2. School of Physics, The University of Sydney and ARC Centre of Excellence for Dark Matter Particle Physics, Sydney, NSW 2006, Australia
3. Dunlap Institute for Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON M5S 3H4, Canada
4. Department of Physics, Princeton University, Jadwin Hall, Princeton, NJ 08544, USA
5. Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91011, USA
6. Columbia Scientific Balloon Facility, 1510 Farm Road 3224, Palestine, TX 75803, USA
7. StarSpec Technologies Inc., Unit C-5, 1600 Industrial Road, Cambridge, ON N3H 4W5, Canada
8. Laboratoire d’Astrophysique, EPFL, Observatoire de Sauverny, 1290 Versoix, Switzerland
9. University of Toronto Institute for Aerospace Studies (UTIAS), 4925 Dufferin Street, Toronto, ON M3H 5T6, Canada
10. NASA Wallops Flight Facility, Balloon Program Office, 34200 Fulton St., Wallops Island, VA 23337, USA
11. Department of Physics, Northeastern University, 360 Huntington Ave., Boston, MA 02115, USA
12. Department of Physics, Washington University in St. Louis, 1 Brookings Drive, St. Louis, MO 63130, USA
13. Department of Physics, University of Toronto, 60 St. George Street, Toronto, ON M5S 1A7, Canada
14. Division of Engineering Science, 40 St. George Street, Room 2110, Toronto, ON M5S 2E4, Canada
15. Palantir Technologies, 1875 Lawrence St., Denver, CO 80202, USA
16. California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125, USA
17. Academia Sinica Institute of Astronomy & Astrophysics, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan