The data items in the NEF_DISTANCE_RESTRAINT_LIST category provides additional details about the list of distance of restraints.
_nef_dihedral_restraint_list.sf_category nef_distance_restraint_list _nef_dihedral_restraint_list.sf_framecode nef_distance_restraint_list_ambig_2 _nef_dihedral_restraint_list.potential_type square-well-parabolic-linear