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. 2025 Jul 29;58(Pt 4):1439–1446. doi: 10.1107/S1600576725005862

Table 1. Examples of groups of symmetry-equivalent reflections (h, k, ℓ)T that can be transformed into each other via rotations about a symmetry axis.

C denotes cubic crystal symmetry, T tetragonal, O orthorhombic, H hexagonal and R rhombohedral.

Crystal symmetry Symmetry axis (hsym, ksym, ℓsym) Reflections (hn, kn, ℓn)
C, T (2, 2, 0) (2, 0, ±2), (0, 2, ±2)
    (3, 1, ±1), (1, 3, ±1)
C, R (1, 1, 1) (1, 1, −1), (1, −1, 1), (−1, 1, 1)
    (4, 0, 0), (0, 4, 0), (0, 0, 4)
    (3, 1, 1), (1, 3, 1), (1, 1, 3)
C, T, O (0, 0, 4) (±1, ±1, 1)
C, T (0, 0, 4) (±3, ±1, 1), (±1, ±3, 1)
H (0, 0, 2) (±1, 0, 1), (0, ±1, 1), (±1, ∓1, 1)
    (±1, ±1, 2), ( 2, ±1, 2), (±1, ∓2, 2)