Dear all I am going to constructed a cell of (8 ,0 ) nanotubes with 48 carbon atom or 80 atom. but i dont know ,how much determine value of cell dm(1)? cell dm(1) =? -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.quantum-espresso.org/pipermail/users/attachments/20130524/4c14a3eb/attachment.html>