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Figure 1
(a) Cation- and (b) anion-centered coordination polyhedra in SrFeF5. The numbers drawn as labels on the Fe3+ ions indicate in which way the helical chain is connected. The numbers shown next to the anionic coordination polyhedra indicate their respective counts within the doubled formula unit Sr[10]Sr[9]Fe2[6]F10. One fluoride anion shows a CN of 2 and is therefore shown with ionic bonds rather than a polyhedron. |

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