| DRAFT DICTIONARY CBF/imgCIF Extensions Dictionary | Draft version 1.5 for comment | 
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Definition:
        The setting of the specified axis in degrees
               against which measurements of the reference beam center
               and reference detector distance should be made.
               This is normally the same for all frames, but the
               option is provided here of making changes when
               needed.
               If not provided, it is assumed to be zero.
Type: float
Mandatory item: implicit
Category: diffrn_scan_frame_axis
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