Abstract
The error treatment given by Blow & Crick [Acta Cryst. (1959). 12, 794-802] in the isomorphous replacement method can be readily introduced into direct methods when they are used to handle the single isomorphous replacement (SIR) or the one-wavelength anomalous scattering (OAS) data. The 'best phase relationship' is defined similarly to the 'best Fourier'. Expressions of the 'best phase' and the 'figure of merit' for individual reflection have been derived for the SIR or OAS case. These enable initial signs to be obtained for a set of ΔϕH without knowing the sign of any one ΔϕH in advance. Finally, a weighting scheme is proposed for the refinement of signs and magnitudes of ΔϕH.
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