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The origin-free modulus sum function SM refines the set Φ of phases of the structure factors by maximizing the coincidence between the experimental origin-free modulus function and the calculated one in terms of the ρ(Φ)2 density function [Rius, J. (1993). Acta Cryst. A49, 406–409]. Maximization is normally achieved through the recursive application of a Fourier-based algorithm. The purpose of the present study is: (i) to show that ρ(Φ)2 can be replaced by |ρ(Φ)| in SM; (ii) to illustrate the viability of the corresponding phasing algorithm with experimental data.

Supporting information

cif

Crystallographic Information File (CIF) https://doi.org/10.1107/S2053273320004945/ae5083sup1.cif
CIF for actinomycin directly obtained from the E map

pdf

Portable Document Format (PDF) file https://doi.org/10.1107/S2053273320004945/ae5083sup2.pdf
Summary of test calculations (25 trials) for actinomycin


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