Figure 3.

The pairwise distance distribution function adapted from X-ray solution scattering (SAXS) combined with crystallography and computation: defining accurate macromolecular structures, conformations and assemblies in solution [3]. Pair-wise distances between each atom are represented. The distances are symmetric and are represented twice by the double arrows. The P(r) function will be zero whenever a particular distance is not defined by the geometry of the sample.