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Figure 7
Rotation-group refinement for a simulated reconstruction of TMV on the CXI endstation (see Table 1[link]). Shown here are the central sections of the reconstructed three-dimensional diffraction volume of TMV after 55 iterations. With 90 Intel Xeon X7542 (2.67 GHz) cores, this full reconstruction took less than 6 h, taking 15 min for each of the slowest refinement iterations using 204 960 rotation-group samples. Red dashed lines in the r.m.s. model change mark when the refinement level of the rotation group was increased by one. In the bottom right-hand plot, rows are colored by each photon pattern's most likely orientation number, which stabilizes after 20 iterations and thereafter quickly re-stabilizes when we increase the rotation-group refinement. The rows (pattern indices) are sorted according to the most likely orientation indices of the last iteration in each rotation-sampling block, which produces a smooth color spectrum along this final column. Since the number of quaternions (quat) increases with rotation refinement, blocks of higher refinement show a wider color spectrum. See §3.2.1[link] for details.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 49| Part 4| August 2016| Pages 1320-1335
doi:10.1107/S1600576716008165
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