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Polyhedral representations of the structures (color online), top normal to the surface and below from the side. The 3 × 1 and 4 × 1 octahedra are brown and tetrahedra are golden; in all the others, octahedra in the outermost layer are brown, dark blue are in the 2nd layerm while TiO5[] are purple in the top layer and light green in the second layer.
