Figure 3.

Stereographic projections showing self-rotation function search results for the X-ray diffraction data. The three viral capsids in the unit cell have the same orientation and the crystallographic threefold axis is parallel to the icosahedral threefold axis; thus, the self-rotation peaks from all three capsids overlap with each other. (a) The rotation function for κ = 72°, showing a search for fivefold icosahedral symmetry elements, using the observed data set in the 10–5.0 Å resolution range with a radius of integration of 120 Å. (b) The rotation function for κ = 120°, showing a search for threefold symmetry elements. (c) The rotation function for κ = 180°, showing a search for twofold symmetry elements.