Figure 1: Structures of some of the magic number clusters. On the right is the complete structure, in the middle the corresponding disclination network and on the left the structure that is at the centre of the cluster. All three have the same orientation.

Figure 2: Schematic representations of the disclination networks for the particularly stable clusters. The terminal disclination lines have been omitted for clarity. The networks, thus drawn, are analogous to the carbon backbones of a series of hydrocarbons.

Jonathan Doye