Data Item _reflns.threshold_expression
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General 
- Item name
- _reflns.threshold_expression
- Category name
- reflns
- Attribute name
- threshold_expression
- Required in PDB entries
- no
- Used in currrent PDB entries
- No
Item Description
The threshold, usually based on multiples of u(I), u(F2)
or u(F), that serves to identify significantly intense
reflections, the number of which is given by _reflns.number_gt.
These reflections are used in the calculation of
_refine.ls_R_factor_gt.
Item Example
I>2u(I)
Data Type 
- Data type code
- text
- Data type detail
- text item types / multi-line text ...
- Primitive data type code
- char
- Regular expression
- [][ \n\t()_,.;:"&<>/\{}'`~!@#$%?+=*A-Za-z0-9|^-]*
Related Items 
| Related Item Name | Relation Type |
|---|---|
| _reflns.observed_criterion | alternate |
Aliases
| Alias Item Name | Dictionary Name | Dictionary Version |
|---|---|---|
| _reflns_threshold_expression | cif_core.dic | 2.3 |