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Figure 23
Three possible choices (orange) of the asymmetric unit (ASU) in a unit cell with P21 space-group symmetry. In all three cases, the 21 screw shown in the diagrams generates the second half of the unit cell, i.e. fills in the white volume.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 43| Part 5| August 2010| Pages 1150-1171
doi:10.1107/S0021889810026956
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