Figure 25.2.1.2

Furey, W.

doi:10.1107/97809553602060000724

International
Tables for
Crystallography
Volume F
Crystallography of biological macromolecules
Edited by M. G. Rossmann and E. Arnold

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International Tables for Crystallography (2006). Vol. F. ch. 25.2, p. 702

Figure 25.2.1.2

W. Furey^a ^*

Figure 25.2.1.2

Relationships between noncrystallographic symmetry rotation axis direction, orthogonal reference system axes X, Y, Z and crystallographic axes. The X axis is aligned with the crystal a. The Y axis is parallel to $[{\bf a} \times {\bf c}^{*}]$ . The Z axis is parallel to $[\bf{X} \times \bf{Y}]$ , i.e. $[{\bf c}^{*}]$ . ψ is the angle between the NC rotation and +Y axes. φ is the angle between the projection of the NC rotation axis in the XZ plane and the +X axis, with +φ counterclockwise when viewed from +Y toward the origin. χ is the amount of rotation about the directed axis, with +χ clockwise when viewed from the axis toward the origin.