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(a), (c) Integrated far-field intensity as a function of the waveguide translation yields a beam width of 37 µm and an angular acceptance of 
= 0.131° at 11.5 keV (35 nm C guiding layer, 
= 690 µm waveguide length). The InSn alloy acts as a beam-blocking material up to 15.5 keV at = 300 µm as no contributions of the primary beam are observed in the waveguide translation scans (d).
