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. 2015 Jan 27;2(Pt 2):177–187. doi: 10.1107/S2052252515000238

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© Schoch et al. 2015

This is an open-access article distributed under the terms of the Creative Commons Attribution Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.

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Self-rotation function analysis of the diffraction data. (a) The stereographic projection of the κ = 180° section of the self-rotation function calculated at 1.82 Å resolution in space group C2 was plotted at a contour level of 40% of the origin peak. The crystallographic twofold axis is at ω = 90°, ϕ = 90°. Six additional twofold axes are visible which form a crescent. (b) Signal of a recurrent peak at ω = 40°, ϕ = 0° as a function of κ that is not visible in (a). The peaks follow the term (n × 360°)/13 with the integer n ≤ 6, indicating 13-fold NCS. Combination of this axis with the crystallographic twofold axis leads to the twofold NCS axes visible in (a).