Mr Blaha, Thank you for your advice. I get it. Haiming Li 2006-10-13 -------------- Haiming Li Beijing Synchrotron Radiation Facility Institute of High Energy Physics Chinese Academy of Sciences 19 Yu Quan Lu, 100049 Beijing, P.R. China Tel: +86 10 8823 3052 ; +86 135 8190 2824 E-mail:lihm at ihep.ac.cn -- USTC Alumni Email System