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Figure 2
Scattering geometry and the three coordinate systems used in pygid: (p1, p2) – pixel positions in the detector real-space coordinate system (green); (xlab, ylab, zlab) – laboratory reciprocal-space coordinate system used in transmission geometry (black); (xsmpl, ysmpl, zsmpl) – sample coordinate system in reciprocal space, rotated by the angle of incidence αi counter-clockwise around the ylab axis, for grazing-incidence geometry (red), direct beam (yellow) and scattered beam (blue) with horizontal (γ) and vertical (δ) scattering angles. The angle of incidence αi is exaggerated for clarity in the visualization.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 59| Part 1| February 2026| Pages 263-275
https://doi.org/10.1107/S1600576725010593
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