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Figure 3
Residual density maps, [\Delta\rho ({\bf{r}} )], in the (110) plane of the diamond lattice are shown for multipolar refinement against (a)–(c) the HC/Rietveld extracted Fobs, (d)–(f) the EHC/Rietveld extracted Fobs and (g)–(i) the static structure factors. (a), (d), (g) HC model subject to constraints on Uiso and s; (b), (e), (h) flexible HC model with refined Uiso and s; and (c), (f), (i) EHC model subject to constraints on Uiso and s. Positive (red) and negative (blue) contour lines are drawn employing a step width of 0.01 e Å−3 and including all structure factors to a [\sin (\theta)/\lambda] resolution of 1.70 Å−1. The black line represents the C—C bonding chain.

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