Dear *Erik Marklund* what do you meant from See the reference for the pdb file format? is b-factor a file? please guide me more. I am beginner in gromacs. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://maillist.sys.kth.se/pipermail/gromacs.org_gmx-users/attachments/20100628/f61647de/attachment.html>