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Figure 4
Diffraction spot profile as a function of detector distance. Diffraction spots close to the beamstop begin to show the characteristic annular microbeam profile once the sample-to-detector distance exceeds about 500 mm. This (−2−21) reflection, which occurs at 18.8 Å, was produced by a large 100 µm-diameter good-quality lysozyme crystal. The upper row of images has been contrast-enhanced to make the halo visible. The lower row of surface plots has been scaled to uniform height for easy comparison. In actuality, the 136 mm profile is six times taller than the 876 mm profile.

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