I appreciate you for your useful guidance I want to determine the minimum distances between COM (center of mass) of a surfactant molecule and that of number of other surfactants but g_mindist compute the distances between one group and a number of other groups. It is not quite clear for me that g_mindist can do it?please guide me about it. -- gmx-users mailing list gmx-users@gromacs.org http://lists.gromacs.org/mailman/listinfo/gmx-users * Please search the archive at http://www.gromacs.org/Support/Mailing_Lists/Search before posting! * Please don't post (un)subscribe requests to the list. Use the www interface or send it to gmx-users-requ...@gromacs.org. * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists