Data items in the EM_MAP_SYMMETRY category record details about the symmetry of the assembly in the map.
_em_map_symmetry.map_id 1 _em_map_symmetry.id 1 _em_map_symmetry.plane_group_name_H-M . _em_map_symmetry.enforced_symmetry . _em_map_symmetry.equiv_pos_as_xyz .