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Figure 4
(a) Unit-cell axes for XUBNIR (red = a, green = b, blue = c), and after transformation by: (b) a mirror plane perpendicular to the a axis, (c) a twofold rotation about the a axis, (d) a mirror plane perpendicular to the c axis, (e) a twofold rotation about the c axis. All five of the unit-cell `boxes' superimpose because β ≃ 90°. Note that the mirror operations change the right-handed coordinate system to left handed, whereas the twofold rotations preserve the handedness. Diagrams generated using Mercury (Macrae et al., 2020BB26).

Journal logoCRYSTALLOGRAPHIC
COMMUNICATIONS
ISSN: 2056-9890
Volume 77| Part 5| May 2021| Pages 452-465
https://doi.org/10.1107/S205698902100342X
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