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Figure 1 A displacement ellipsoid diagram showing the coordination around the cations. Atomic displacement parameters are given at the 50% probability level [Symmetry codes: (i) x,-y + ,z; (ii) −x + 1,-y − 1,z − 2; (iii) x + 1,y,z; (iv) x + 1,-y + ,z; (v) −x + 1,y + 1/2,-z + 1]. |