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![[Figure 1]](me6192fig1mag.jpg)
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Figure 1
The Nexus McStas axis system is different from the CBF laboratory system. Seen from the source in McStas, Z points away from the source and the X axis points to the left, while in CBF Z points back into the source and X is along the principal goniometer axis, i.e. points into the goniometer block. A vector defined in McStas is brought by a 180° rotation around Nexus_X to the CBF system. Note that if the goniometer is at the opposite side, the transformation is around Nexus_Y (image courtesy of the Gold Standard paper, Bernstein et al., 2020  ). |
![[Figure 1]](me6192fig1.jpg)
 | IUCrDATA |
ISSN: 2414-3146
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