Data Item _pdbx_reflns_twin.fraction

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 0.9 % 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]+)?