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Figure 27
The repeat distance along the 21 axis is effectively halved and constellations of identical motifs are repeated in this direction every half of the cell length (left). In consequence, for space group P21, reflections 0k0 with k odd are absent. There is no such effect in directions that are not exactly parallel to the screw axis (right).

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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