XmlmmCIF equivalent: chem_comp_plane_atom Data items in the CHEM_COMP_PLANE_ATOM category enumerate the atoms in a plane within a chemical component. XmlmmCIF equivalent: chem_comp_plane_atom/dist_esd This data item is the standard deviation of the out-of-plane distance for this atom. XmlmmCIF equivalent: chem_comp_plane_atom/plane_id This data item is a pointer to _chem_comp_plane.id in the CHEM_COMP_PLANE category. XmlmmCIF equivalent: chem_comp_plane_atom/atom_id The id of an atom involved in the plane. This data item is a pointer to _chem_comp_atom.atom_id in the CHEM_COMP_ATOM category. XmlmmCIF equivalent: chem_comp_plane_atom/comp_id This data item is a pointer to _chem_comp.id in the CHEM_COMP category.