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Examples of Ek planes.

Such planes are readily found in the diagrams of ITA83 as planes parallel to just one axis and projected as dashed lines, e.g. xxz in P4bm and $P\bar 42_1m$ (Nos. 100 and 113). In particular, Table 3 is exactly in conformity with the distinction shown between Ek and En planes. See, for instance, the dashed and dot-dashed lines for R3m and R3c (Nos. 160 and 161).

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