| 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.
               In general, this will agree with
               _diffrn_scan_frame_axis.reference_angle.
               If the individual frame values vary, then the value of
               _diffrn_scan_axis.reference_angle will be
               representative of the ensemble of values of
               _diffrn_scan_frame_axis.reference_angle (e.g.
               the mean).
               If not specified, the value defaults to zero.
Type: float
Mandatory item: implicit
Category: diffrn_scan_axis
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