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Figure 6
Fitting example with concave elliptic cylinder height data. The red dot indicates the location of chief ray intersection from the fitting. (a) Fitting results with fixed p, q, and θ, and optimized xi and β. (b) Fitting results by including θ in the optimization to further minimize coma-like residuals.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 33| Part 2| March 2026| Pages 278-288
https://doi.org/10.1107/S1600577525011282
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