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Schematic layout of an SFX experiment. a) Injector-based and b) fixed target crystal delivery systems. XFEL beam is focused by beamline optics (K-B mirrors in this illustration) and diffracts from microcrystals delivered by an injector (a) or deposited on a solid support and rastered by a fast stage (b). Sample delivery is typically performed in vacuum or helium environment to reduce scattering from the direct beam.
