Data Item _pdbx_reflns_twin.fraction
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General 
- Item name
- _pdbx_reflns_twin.fraction
- Category name
- pdbx_reflns_twin
- Attribute name
- fraction
- Required in PDB entries
- yes
- Used in current PDB entries
- Yes, in about 0.8 % of entries
Item Description
The twin fraction or twin factor represents a quantitative parameter for the
crystal twinning. The value 0 represents no twinning, < 0.5 partial twinning,
= 0.5 for perfect twinning.
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]+)?