Data Item _refine.ls_abs_structure_Flack
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General 
- Item name
- _refine.ls_abs_structure_Flack
- Category name
- refine
- Attribute name
- ls_abs_structure_Flack
- Required in PDB entries
- no
- Used in current PDB entries
- No
Item Description
The measure of absolute structure (enantiomorph or polarity) as
defined by Flack (1983).
For centrosymmetric structures, the only permitted value, if the
data name is present, is 'inapplicable', represented by '.' .
For noncentrosymmetric structures the value must lie in the
99.97% Gaussian confidence interval -3u =< x =< 1 + 3u and a
standard uncertainty (estimated standard deviation) u must
be supplied. The item range of [0.0:1.0] is correctly
interpreted as meaning (0.0 - 3u) =< x =< (1.0 + 3u).
Ref: Flack, H. D. (1983). Acta Cryst. A39, 876-881.
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]+)?
Allowed Boundary Conditions
| Minimum Value | Maximum Value |
|---|---|
| 0.0 | 1.0 |
Related Items 
| Related Item Name | Relation Type |
|---|---|
| _refine.ls_abs_structure_Flack_esd | associated_esd |
Aliases
| Alias Item Name | Dictionary Name | Dictionary Version |
|---|---|---|
| _refine_ls_abs_structure_Flack | cif_core.dic | 2.0.1 |