Figure 1: A single exposure from a stationary single crystal of wüstite, (false colour map, white = high intensity). High-energy X-rays (65.35 keV in this case) give a small wavelength, , and an almost flat Ewald sphere. Hence these data closely approximate the section. Every Bragg reflection (and also the origin) is surrounded by a motif of incommensurate scattering. Second-order incommensurate spots have been arrowed and some Miller indices noted for scale .