Figure 2
NGT with edge-centre and face-centre atoms. The ODs of the (a) vertex, (b) edge-centre, (c) face-centre of a triangle, (d) face-centre of a square and (e) face-centre of a rhombus. The divisions assigned by 1–4 in part (a) generate vertices in the same local configuration in part (f), and the divisions assigned by 1–3 in part (c) generate triangles in the same local configuration in part (g). The rates in parts (f) and (g) are the frequencies of each local configuration. The positions derived from the ODs in parts (a)–(d) are represented by the same colour in part (h). |