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Figure 1
Schematic representation of a scattering experiment. (a) An incident beam is shown scattering from two point scatterers (represented by the black dots) within a globular macromolecule. The diffracted rays are in phase with each other but out of step by λ at the scattering angle [2{\rm{\theta }}] shown, causing constructive interference. The accumulation of these events at low angles gives rise to the scattering pattern of the macromolecule. (b) In a typical small-angle scattering experiment, diffraction from high-scattering-density macromolecules in a low-scattering-density solution gives rise to a scattering pattern on an area detector. q is the scattering vector [{{\bf k}_{\rm s}}- {{\bf k}_{\rm i}}]. The radial average of the scattering pattern about the position of the direct main beam gives rise to the scattering curve I(Q) in reciprocal space.

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