1. National Space Institute, Technical University of Denmark , Elektrovej 327, 2800 Kongens Lyngby, Denmark
2. Physics Dept., McGill University , 3600 Rue University, Montreal, QC, H3A 2T8, Canada
3. Anton Pannekoek Institute for Astronomy, University of Amsterdam , Postbus 94249, NL-1090 GE Amsterdam, the Netherlands
4. International Space Science Institute , Hallerstrasse 6, 3012 Bern, Switzerland
5. School of Physics & Astronomy, Monash University , VIC 3800, Australia
6. SRON Netherlands Institute for Space Research , Niels Bohrweg 4, 2333 CA Leiden, The Netherlands
7. Cosine measurement systems , Oosteinde 36, Warmond, 2361 HE, The Netherlands
8. ESA/ESTEC , Keplerlaan 1, 2201 AZ Noordwijk, The Netherlands
9. Dept. of Physics and Astronomy and National Superconducting Cyclotron Laboratory, Michigan State University , East Lansing, MI 48824
10. Department of Physics and Mathematics, Aoyama Gakuin University , 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5258, Japan