Figure 1.

Sections of the rotation function calculated from AiV1 diffraction data processed in space group I23. Stereographic plots of (a) κ = 180°, (b) κ = 120°, (c) κ = 90° and (d) κ = 72° rotation-function sections were calculated using 12–7 Å resolution AiV1 diffraction data and a 150 Å radius of integration. The plots were contoured in 0.5σ increments of the rotation-function values starting from 1.0σ. Peaks of shared crystallographic and icosahedral symmetry are highlighted with red circles in (a) and (b). All of the remaining non-noise peaks belong to NCS symmetry. Fivefold symmetry peaks corresponding to the twin domains are differentiated by blue and green circles in (d).