1. National Astronomical Observatory (NAOJ), Mitaka, Tokyo 181-8588, Japan.
2. Kwasan and Hida Observatories, Kyoto University, Yamashina, Kyoto 607-8471, Japan.
3. Lockheed Martin Solar and Astrophysics Laboratory, B/252, 3251 Hanover Street, Palo Alto, CA 94304, USA.
4. High Altitude Observatory, National Center for Atmospheric Research, Post Office Box 3000, Boulder CO 80307–3000, USA.
5. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA), Sagamihara, Kanagawa 229-8510, Japan.