The (16-4) structure consists of AlB2-type local structure and cubic framework constituted by large spheres. A cubic framework is occupied by an octahedron consisting of small spheres. The structural data of the (16-4) structure
at several radius ratios: $0.443$, $0.445$, $0.448$, $0.451$, $0.454$, $0.457$, $0.460$, $0.463$, $0.465$, and $0.468$, are downloadable