Novel phasing method using the origin‐free modulus sum function expressed in terms of the absolute electron density

The origin‐free modulus sum function S M 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. A 49 , 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 S M ; (ii) to illustrate the viability of the corresponding phasing algorithm with experimental data.