yi@yonsei.ac.kr

¹ Department of Astronomy, Yonsei University, Seoul 120-749, Republic of Korea
² Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey, RH5 6NT, UK
³ National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85719, USA
⁴ Lowell Observatory, Flagstaff, AZ 86001, USA
⁵ Korea Astronomy and Space Science Institute, Hwaam 61-1, Yuseong, Daejeon 305-348, Republic of Korea
⁶ Observatories of the Carnegie Institution of Washington, 813 Santa Barbara St., Pasadena, CA 91101, USA
⁷ California Institute of Technology, MC 405-47, 1200 E. California Blvd., Pasadena, CA 91125, USA
⁸ Laboratory for Astronomy and Solar Physics, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
⁹ Department of Astronomy, Columbia University, New York, NY 10027, USA