J. Appl. Cryst. (2001). 34, 27-32 [ doi:10.1107/S0021889800011882 ]
Abstract: The concept of a general four-circle diffractometer has been realised by introducing axial misalignments into mathematical formulae describing the diffractometer geometry. The advantage of using the described diffractometer formalism for routine measurements is discussed. Transformations of the setting angles of the reflections between different diffractometers, as well as the propagation of errors arising from the misalignment of axes, are taken into account.
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