Image dictionary (imgCIF) version 1.3.2
The value of _diffrn_detector_element.center is the Y component of the distortion-corrected beam centre in millimetres from the (0, 0) (lower-left) corner of the detector element viewed from the sample side. The X and Y axes are the laboratory coordinate system coordinates defined in the AXIS category measured when all positioning axes for the detector are at their zero settings. If the resulting X or Y axis is then orthogonal to the detector, the Z axis is used instead of the orthogonal axis.
Mandatory item: no
Enumeration default: 0.0