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Figure 7
When images have asymmetry in their spatial resolution, one can define azimuthal angle ranges about the x and y axes (shown here as blue and red regions, respectively) to obtain separate estimates of spatial resolution of δres,x and δres,y. We used azimuthal angle ranges of ±30° about the x and y axes as a compromise between the mixing of ux and uy components and having too few `spatial frequency pixels' in each Fourier direction for each circle being averaged over.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 33| Part 2| March 2026| Pages 319-330
https://doi.org/10.1107/S1600577526000925
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