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Figure 1
Rotation axis l (in red). (a) Definition of the positive (trigonometric, right hand) direction of rotation. (b) Definition of the rotation axes by direction cosines. (c) Definition of the rotation axis by polar coordinates. (d) Example of a standard (h = ex, n = ey) and alternative (h′ = ey, n′ = −ex) choice for the azimuth axis.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 52| Part 4| August 2019| Pages 869-881
https://doi.org/10.1107/S1600576719007313
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