Data Item _atom_site.fract_x
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General 
- Item name
- _atom_site.fract_x
- Category name
- atom_site
- Attribute name
- fract_x
- Required in PDB entries
- no
- Used in current PDB entries
- Yes, in about 0.000 % of entries
Item Description
The x coordinate of the atom-site position specified as a
fraction of _cell.length_a.
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]+)?
Related Items 
| Related Item Name | Relation Type |
|---|---|
| _atom_site.fract_x_esd | associated_esd |
Dependent Items
Subcategories
| Subcategory Name | Subcategory Description |
|---|---|
| fractional_coordinate | The collection of x, y, and z components of a position specified with reference to unit cell directions. |
Aliases
| Alias Item Name | Dictionary Name | Dictionary Version |
|---|---|---|
| _atom_site_fract_x | cif_core.dic | 2.0.1 |