Hi, I must have done something wrong when I sent out the request. Now I am getting a FLOOD of messages. Thank you all and I already got what I need. Hui Li -- Dept. of Space Physics and Astronomy (713) 527-8101 ext 2651 (OFFICE) Rice University, P.O. Box 1892 (713) 285-5143 (FAX) Houston, Texas 77251-1892 E-MAIL: lip@spacsun.rice.edu