Data Item _reflns.number_obs
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General 
- Item name
- _reflns.number_obs
- Category name
- reflns
- Attribute name
- number_obs
- Required in PDB entries
- no
- Required for PDB deposition
- yes
- Used in current PDB entries
- Yes, in about 82.3 % of entries
Item Description
The number of reflections in the REFLN list (not the DIFFRN_REFLN
list) classified as observed (see _reflns.observed_criterion).
This number may contain Friedel-equivalent reflections according
to the nature of the structure and the procedures used.
Additional Descriptive Information for Depositors
The number of unique reflections collected after using any sigma cutoffs
Data Type 
- Data type code
- int
- Data type detail
- int item types are the subset of numbers that are the negative or positive integers.
- Primitive data type code
- numb
- Regular expression
- [+-]?[0-9]+
Allowed Boundary Conditions
| Minimum Value | Maximum Value |
|---|---|
| 0 | +∞ |
Aliases
| Alias Item Name | Dictionary Name | Dictionary Version |
|---|---|---|
| _reflns_number_observed | cif_core.dic | 2.0.1 |