Data Item _diffrn_scan_axis.reference_displacement
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General 
- Item name
- _diffrn_scan_axis.reference_displacement
- Category name
- diffrn_scan_axis
- Attribute name
- reference_displacement
- Required in PDB entries
- implicit
- Used in currrent PDB entries
- No
Item Description
The setting of the specified axis in millimetres
against which measurements of the reference beam centre
and reference detector distance should be made.
In general, this will agree with
_diffrn_scan_frame_axis.reference_displacement.
If the individual frame values vary, then the value of
_diffrn_scan_axis.reference_displacement will be
representative of the ensemble of values of
_diffrn_scan_frame_axis.reference_displacement (e.g.
the mean).
Data Type 
- Data type code
- float
- Data type detail
- float item types are the subset of numbers that are the floating point numbers.
- Primitive data type code
- numb
- Regular expression
- -?(([0-9]+)[.]?|([0-9]*[.][0-9]+))([(][0-9]+[)])?([eE][+-]?[0-9]+)?
- Units
- millimetres