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![[Figure 2]](gm5043fig2mag.jpg)
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Figure 2
The definition of the detector-distance parameter requires a vector p0 from the origin of the laboratory frame within the crystal, Oc, to a point on the detector surface along the initial detector normal vector ![[\hat{\bf d}_n^\prime]](teximages/gm5043fi25.gif) . The length of this vector p0 defines the detector distance. The orthogonal shift parameters t1 and t2 are determined with reference to the point p1 at the centre of the detector plane, as set by the limits xlim and ylim. Note that here t2 is negative as the shift required along ![[\hat{\bf d}_y^\prime]](teximages/gm5043fi27.gif) goes against the direction of this vector. Following location of the centre of the detector plane in its initial orientation, rotations determined by the orientational parameters are applied about the point p0. The action of these orientation parameters is not shown here. |
![[Figure 2]](gm5043fig2.jpg)
 | STRUCTURAL BIOLOGY |
ISSN: 2059-7983
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