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Figure 13
Soft X-ray diffractions through a circular pinhole, using photons of different energies: auto-adaptive-gain mode. (a) 250 eV photons; (b) 399 eV photons; (c) 710 eV photons; (d) 1000 eV photons. Airy ring patterns are visible in the detector output; as expected, the spatial frequency of the rings is proportional to the photon energy. The horizontal white stripe artefact (negative pedestal shift) related to the region of maximum illumination is discussed in Section 5.3[link].

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