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Figure 5
The upper two panels compare the intensity measured on one of the EXED detector panels (there were four detector panels in total, two forward and two backward) after counting foreground and background for 4 h each. The detector pixels are not square. The data in panels (a) and (b) are displayed using a logarithmic colour scale, and the features seen in both are discussed in the main text. The effect of the perforated beamstop is clear in these panels. Panel (c) shows the foreground minus the background, un-smoothed and with a linear colour scale. The double diffraction signals present in the foreground and background cancel, but Poisson errors in the large counts near the main beam are seen in the difference signal. As indicated by the geometry in Fig. 1[link], the VL signal is diffracted at different angles depending on wavelength, so is spread out on the detector. For this magnet rotation angle, they appear as faint diagonal streaks to the right of the beam centre; one of them is inside the red ellipse in panel (c).

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 55| Part 5| October 2022| Pages 1314-1323
https://doi.org/10.1107/S1600576722008226
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