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Figure 4
Speckle contrast βres as a function of beam size a on the sample according to equation (13[link]). Calculated for photon energies of 8 (red), 15 (green) and 24 keV (blue) and for sample-to-detector distances L = 100 m (top lines) and L = 5 m (bottom lines).

IUCrJ
Volume 6| Part 5| September 2019| Pages 794-803
ISSN: 2052-2525
https://doi.org/10.1107/S2052252519008273