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Figure 4
(a) A unit cell with two identical rigid units (ducks) related by a mirror line (horizontal line); the border indicates the unit-cell dimensions in the pm crystal. (b) The symmetry summed autocorrelation region of the two ducks shown in (a) (solid line) with space group p2/m, with regions corresponding to the two autocorrelation functions coloured to match the corresponding duck. Inversion symmetry through the origin (white circle) has generated a second mirror line (vertical line). (c) The full un-aliased autocorrelation of the unit cell, with the cross-correlation terms between the two ducks coloured in yellow. (d) The Patterson map of the crystal inside the unit-cell area (coloured) and outside the unit cell (in grey). (e) The Patterson map of the crystal confined to the unit-cell area and excluding the region occupied only by the aliased autocorrelation of the two ducks.

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ISSN: 2053-2733
Volume 75| Part 1| January 2019| Pages 25-40
https://doi.org/10.1107/S2053273318015395
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