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Free R-factor calculations were used to define the optimal weights on symmetry and similarity restraints in the experimental charge-density analysis of a small organic compound with two molecules in the asymmetric unit. An anharmonic model was applied to the N atoms of the amino groups and to one nitro group in order to account for the high residual density peaks in harmonic refinement and to obtain a better charge-density model.
addenda and errata
A correction to the article by Zarychta et al. [(2011). Acta Cryst. B67, 250-262].
