Dear Stefano de Gironcoli and L.F.Huang, Thank you so much for your help and quick reply. I understand your mean and I will do it right now. Thanks again for your kind help.
Wishing you a sparkling Christmas and bright happy New Year! Best Regards, Li Niu Ph.D. Candidate, Center for Composite Materials, Harbin Institute of Technology, Harbin, Heilongjiang, 150080, China ___________________________________________________________ ????????????????? http://card.mail.cn.yahoo.com/