| DRAFT DICTIONARY CBF/imgCIF Extensions Dictionary | Draft version 1.5 for comment | 
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Definition:
        The value of _array_structure_list_axis.reference_displacement
               specifies the setting of the displacement of this axis used
               for determining a reference beam center and a reference detector
               distance.  It is normally expected to be identical to the value
               of _array_structure_list.displacement.
Type: float
Mandatory item: implicit
Category: array_structure_list_axis
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