Dear Stefano Baroni: Thank you for your suggestion. Best regards. -- Y. C. Cheng Department of Phyics Nanjing University Nanjing 210093 P. R. China Tel: 86-25-83592907 Email: yccheng.nju at gmail.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.quantum-espresso.org/pipermail/users/attachments/20080411/942f62ea/attachment.html>