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Figure 3
(a) The decay of contrast from fits to the negative binomial distribution for P(K = 2) after binning detector images along the direction of the angular misalignment for various bin sizes. The range of β grows smaller with increasing bin sizes since there are more speckle degrees of freedom, but the 60 µrad and collinear contrast profiles approach each other as well. (b) The characteristic decay time constant extracted from fitting a stretched exponential function to the change in contrast for various bin sizes in both the collinear and angular mismatch cases.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 27| Part 6| November 2020| Pages 1626-1632
https://doi.org/10.1107/S1600577520012345
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