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Figure 4
The geometry for calculating the positions [{\bf Q}], in terms of incident angles and detector capture angles 2θ, used to construct the path lengths described by equation (6)[link]: l = a + b = [(d / \cos \alpha) [\sin (\Omega+\alpha)] + [\sin(2 \theta - \Omega - \alpha)]] [adapted from Fewster (2016BB6)].

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ISSN: 2053-2733
Volume 74| Part 5| September 2018| Pages 447-456
https://doi.org/10.1107/S2053273318003959
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