| DRAFT DICTIONARY CBF/imgCIF Extensions Dictionary | Draft version 1.5 for comment | 
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Definition:
        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.
Type: code
Mandatory item: yes
_array_structure_list_axis.axis_set_idCategory: array_structure_list
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