Image dictionary (imgCIF) version 1.3.2
This is a descriptor for the physical axis or set of axes corresponding to an array index. This data item is related to the axes of the detector itself given in DIFFRN_DETECTOR_AXIS, but usually differs in that the axes in this category are the axes of the coordinate system of reported data points, while the axes in DIFFRN_DETECTOR_AXIS are the physical axes of the detector describing the 'poise' of the detector as an overall physical object. If there is only one axis in the set, the identifier of that axis should be used as the identifier of the set.
Mandatory item: yes
The following item(s) have an equivalent role in their respective categories: