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Figure 7
Three-dimensional rotation of a NW. The angles θ, ϕ and ψ are the angles of rotations about the x, y and z axes, respectively, and referred to as roll, pitch and yaw angles in nautical notation. The angles θ and ϕ define a random orientation of the long axis of the NW and vary in the range 3–5°, as determined from the tilt measurements. The mean value of the angle ψ defines an average orientation of the side facets with respect to the incident X-ray beam, and its variation in the range 2–4° is determined from the twist measurements.

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ISSN: 2053-2733
Volume 77| Part 1| January 2021| Pages 42-53
https://doi.org/10.1107/S205327332001548X
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