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Figure 4
A schematic view of a type `A' layer, where only the Na+ cations and –SO3 groups are drawn, showing the variety of loops linking the cations. For intercationic distances, see Table 1 . The significance of the light- and dark-grey shaded areas is discussed in the Comment. [Symmetry codes: (i) −x + 1, −y + 1, −z + 1; (ii) −x + 1, y − , −z + ; (iii) x, y − 1, z; (iv) −x + 1, −y, −z + 1; (v) x, −y + , z − ; (vii) x, −y + , z + ; (viii) x, y + 1, z; (ix) −x + 1, y + , −z + .] |


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