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Figure 2
Experimental on-axis height deviation δhM(x, 0) from the spherical form of the grating substrate in the longitudinal direction at a sampling rate of 5 mm−1 (black) and its polynomial fit in the Legendre basis of 35th order (red). Residuals describe the difference between model and data.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 33| Part 4| July 2026|
https://doi.org/10.1107/S1600577526005254
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