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November 2006 issue
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Cover illustration: Determination of a one-dimensional structure by the charge flipping algorithm. Bottom curves: grey is the initial electron density obtained with a random choice of structure-factor phases; white is the result of charge flipping, i.e. the sign of the density below a threshold is reversed. Top curves: electron density after convergence (blue) and its flipped counterpart (red). Only the three atomic regions correspond to the true structure, small oscillations do not. See Oszlányi & Süto [Acta Cryst. (2004), A60, 134-141; (2005), A61, 147-152].
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