Figure 1
(a) A three-atom two-dimensional target structure: plane group pg; (b) the corresponding Patterson map, plane group p2mm; (c) the C map when the S atom is the only atom in the model structure. Its symmetry group is pm, but the Patterson S-atom substructure satisfies the p2mm symmetry; (d) the corresponding C'map, with p2mm symmetry.  [article HTML]

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