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Figure 3
Schematic illustration of likelihood function for partial translational ambiguity. This example illustrates the uncertainty in an acentric structure factor in space group P622 when a translation search is conducted over the xy plane, leaving the z coordinate undefined. For any particular xy combination, varying z will change the phases of two groups of six molecular transforms in concert. At the correct xy translation, the uncertainty in z corresponds to uncertainty in the relative phase angle between the two sums of six molecular transforms, shown as heavy arrows. This uncertainty is modeled as a Sim-like probability distribution, similar to that shown in Fig. 2[link](b).

Journal logoBIOLOGICAL
CRYSTALLOGRAPHY
ISSN: 1399-0047
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