1. The University of Tokyo, Department of Physics, Tokyo
2. Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science, Sagamihara, Kanaga
3. Kyoto University, Department of Astronomy, Kyoto
4. Hiroshima University, School of Science, Higashi-Hiroshima
5. Tokyo University of Science, Department of Physics, Yamazaki, Noda, Chiba
6. Waseda University, Research Institute for Science and Engineering, Shinjuku, Tokyo
7. Kyoto University, Department of Physics, Sakyo, Kyoto
8. Laboratoire APC, Paris
9. CEA Saclay, Gif sur Yvette
10. Institute of Physical and Chemical Research, Wako, Saitama
11. Yamagata University, Faculty of Science, Yamagata