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Item _diffrn_scan_axis.displacement_increment

Description

               The increment for each step for the specified axis
               in millimetres.  In general, this will agree with
               '_diffrn_scan_frame_axis.displacement_increment'.
               The sum of the values of
               '_diffrn_scan_frame_axis.displacement' and
               '_diffrn_scan_frame_axis.displacement_increment' is the
               angular setting of the axis at the end of the integration
               time for a given frame.  If the individual frame values
               vary, then the value of
               '_diffrn_scan_axis.displacement_increment' will be
               representative
               of the ensemble of values of
               '_diffrn_scan_frame_axis.displacement_increment' (e.g.
               the mean).

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Mandatory Code

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