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Figure 7
The SAD phase ambiguity. If the positions of anomalous scatterers are known, their scattering contribution can be calculated. (a) With the accurately measured amplitudes of two Friedel mates, FT+ and [F_{T}^-}], there are two possible solutions for the total protein phase φT placed symmetrically around φA − 90°, the direction of the anomalous vector [F''_{A}]. (b) If the measurement errors of the Friedel amplitudes are taken into account, the protein phase can be described by a predictable probability distribution.

Journal logoBIOLOGICAL
CRYSTALLOGRAPHY
ISSN: 1399-0047
Volume 58| Part 11| October 2002| Pages 1958-1967
doi:10.1107/S0907444902016645
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