Fig. 8.

The following selected structures are illustrated: straight elongated clusters of model A⁵⁰ with β ε = 8 (a), the same elongated cluster as “a” from a different angle (b), two spiral elongated clusters of model B⁵⁰ with β ε = 10 (c), spherical clusters of model B⁵⁰ with β ε = 8 (d), mono-layer of model C⁵⁰ with β ε = 8 (e), and spherical shells of model D⁵⁰ with β ε = 8 (f). The blue boxes represent the periodic boundaries.