Data Item _diffrn_scan_frame_axis.reference_displacement
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General 
- Item name
- _diffrn_scan_frame_axis.reference_displacement
- Category name
- diffrn_scan_frame_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 for this
frame against which measurements of the reference beam centre
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 equal to
_diffrn_scan_frame_axis.displacement.
Data Type 
- Data type code
- float
- Data type detail
- float item types are the subset of numbers that are the floating numbers.
- Primitive data type code
- numb
- Regular expression
- -?(([0-9]+)[.]?|([0-9]*[.][0-9]+))([(][0-9]+[)])?([eE][+-]?[0-9]+)?
- Units
- millimetres