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Figure 2
The NeXus/HDF5 files specify axes in the NeXus McStas coordinate system. The standard coordinate frame in NeXus is the McStas coordinate frame, in which the Z axis points in the direction of the incident beam, the X axis is orthogonal to the Z axis in the horizontal plane and pointing left as seen from the source, and the Y axis points upwards to form a right-handed axis system. The origin is in the sample.

IUCrJ
Volume 7| Part 5| September 2020| Pages 784-792
ISSN: 2052-2525
https://doi.org/10.1107/S2052252520008672