Hi Justin, Thanks for your information. My atom group contains only 3 atoms, each of which is on one chain of a triple helix. Flat-bottomed is new for me. I went through section 4.3.2 in the manual, but still feel confused about how to get the parameters and how to apply constraints. Do you think flat-bottomed is suitable for my case?
Thank you, Ming -- Gromacs Users mailing list * Please search the archive at http://www.gromacs.org/Support/Mailing_Lists/GMX-Users_List before posting! * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists * For (un)subscribe requests visit https://maillist.sys.kth.se/mailman/listinfo/gromacs.org_gmx-users or send a mail to gmx-users-requ...@gromacs.org.