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Figure 8
A group–subgroup graph showing all the intermediate subgroups between the specified subgroup of type Cm and the parent space group [P{\overline 4}2_{1}m] (No. 113), as obtained calling the program Get_irreps. The graph shows all intermediate subgroups, including those with lattices different from the one that is required for the subgroup Cm. In the case of those subgroups which are isotropy subgroups listed in Fig. 7, the corresponding irrep is also indicated. The numbers for each subgroup are those in the list provided by the program (not shown here), where the subgroups are fully defined.

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CRYSTALLOGRAPHY
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