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Figure 1
Geometric definition of partiality, accounting for the mosaic structure of the crystal. For a still shot taken with monochromatic X-rays of wavelength λ, a reciprocal lattice point (blue ball centered on Q) partially intersects the Ewald sphere. The intersection area, which is actually a spherical cap, is approximated by a circle of radius rp, which is determined by rh, the distance from Q to the Ewald sphere, and rs, the resolution-dependent radius of the reciprocal lattice point as described in the text. Partiality is defined as the intersection area-to-ball volume ratio for lattice point Q, normalized by the intersection area-to-ball volume ratio of the F000 spot at reciprocal space origin O.

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