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Figure 22
Two possible choices of the unit-cell origin in the space group P212121, both at the midpoint of three non-intersecting pairs of parallel 21 axes. These two choices differ by a shift of the cell origin of ([1\over4], [1\over4], [1\over4]). In ITA, the variant shown on the left is adopted.

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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