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Figure 3
Residual electron density in the planes through C2A, C4A and C8AA (top) and C2B, C4B and C4AB (bottom); contour lines are drawn at 0.2 e Å−3. Covalent bonds in the heterocyclic cations clearly show up as local density maxima.

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COMMUNICATIONS
ISSN: 2056-9890
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