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
- 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 total number of crystallographically unique measured reflections that are labeled as observed by the criterion on sigma(I) or on sigma(F).
Additional Item Example for Depositors1
2300
Additional Item Example for Depositors2
4300
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 |