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Figure 1
The diffraction geometry of the simple central impact model used by DIALS. Vectors are expressed in either a reciprocal-space or real-space laboratory frame. The rotation axis [\hat{\bf e}] intersects the origin of laboratory space within the crystal at Oc and defines a right-handed rotation. The direct-beam wavevector s0 passes through Oc and defines the origin of reciprocal space Ors at its tip. A reciprocal-lattice point rotated by an angle φ to touch the surface of the Ewald sphere is shown by rφ. The diffracted beam wavevector s1 extends from Oc to the tip of rφ. Further projection of this vector leads to an intersection on a detector plane at the position marked (X, Y). The detector plane is described by three vectors: d0, which defines the origin of the detector coordinate system Od at one corner of the plane, and a pair of mutually orthogonal unit vectors [\hat{\bf d}_x] and [\hat{\bf d}_y] defining a Cartesian plane. The detector normal vector [\hat{\bf d}_n = \hat{\bf d}_x \times \hat{\bf d}_y] completes the detector coordinate system basis. The position (X, Y) is recorded if it is inside the pair of limits (xlim, ylim).

Journal logoSTRUCTURAL
BIOLOGY
ISSN: 2059-7983
Volume 72| Part 4| April 2016| Pages 558-575
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