Data Item _atom_site.occupancy
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General 
- Item name
- _atom_site.occupancy
- Category name
- atom_site
- Attribute name
- occupancy
- Required in PDB entries
- no
- Used in current PDB entries
- Yes, in about 94.0 % of entries
Item Description
The fraction of the atom type present at this site.
The sum of the occupancies of all the atom types at this site
may not significantly exceed 1.0 unless it is a dummy site.
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]+)?
- Default value
- 1.0
Related Items 
| Related Item Name | Relation Type |
|---|---|
| _atom_site.occupancy_esd | associated_esd |
Aliases
| Alias Item Name | Dictionary Name | Dictionary Version |
|---|---|---|
| _atom_site_occupancy | cif_core.dic | 2.0.1 |