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Figure 2
Introduction of the three standard coordinate systems and the corresponding orientation angles necessary for the discussion of diffraction experiments. Top: laboratory frame ([{\cal L}]) defined with respect to the specimen frame ([{\cal S}]) by the diffraction angles [\varphi], [\psi] and χ. Bottom: orientation of reference frames defined by the orientation of the diffraction vector (for a fixed HKL, [\varphi], [\psi] and χ).

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