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Figure 5
Errors for an atomic structure factor. (a) An atom has variation in position (indicated by purple arrow) and in scattering (indicated in green concentric circles). (b) The variation in the atom's position and scattering are Gaussian. (c) The atom at its mean position with its mean scattering has a structure factor Fatom (shown with a black vector). Variation in the atom's position corresponds to variation in the phase of Fatom (shown with a purple arrow) and variation in the scattering corresponds to variation in the length of Fatom (shown with a green arrow). (d) The distributions of the structure factors owing to variation in the atom's position and scattering combine to give a boomerang-shaped structure-factor distribution (indicated with black contours). Since the distribution of structure factors is symmetric about Fatom, the average structure factor is shorter than Fatom (by a fraction d, where 0 < d < 1) but in the same direction as Fatom (dFatom).

Journal logoBIOLOGICAL
ISSN: 1399-0047
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