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Figure 4
Binary decorations of chiral spiral cyclic twins. Conditions are represented as [{\cal C}_{q}(p) \colon \langle p\bmod 2\rangle = q], where q ∈ {0, 1}. The symbols [\land] and [\lor] denote the logical AND and OR operators. Shown are the following cases: (a) alternating colours along k, condition [{\cal C}_{0}(k)]; (b) alternating colours along ℓ, [{\cal C}_{0}(\ell)]; (c) alternating colours along ℓ in groups of the same baseline level, [{\cal C}_{0}(\beta_{\ell})]; (d) alternating colours along ℓ in groups of the same t parameter, [{\cal C}_{0}(t_{\ell})]; (e) highlighting cis configurations; [{\cal C}_{0}(\alpha_{\ell-1} - \alpha_{\ell-2}) \lor {\cal C}_{0}(\alpha_{\ell} - \alpha_{\ell-1})]; (f) highlighting twin domains, [[{\cal C}_{0}(\beta_{\ell}) \land {\cal C}_{1}(k)] \lor [{\cal C}_{1}(\beta_{\ell}) \land {\cal C}_{0}(k)]]; (g) alternating colours in k and ℓ combined, [{\cal C}_{0}(k+\ell)]; (h) alternating colours in ℓ and alternating filling styles in k and ℓ combined (case of NiZr), [{\cal C}_{0}(\ell)] and [{\cal C}_{0}(k+\ell)].

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ISSN: 2053-2733
Volume 79| Part 6| November 2023| Pages 570-586
https://doi.org/10.1107/S2053273323008276
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