Data Item _space_group.centring_type
Browse:
General 
- Item name
- _space_group.centring_type
- Category name
- space_group
- Attribute name
- centring_type
- Required in PDB entries
- no
- Used in currrent PDB entries
- No
Item Description
Symbol for the lattice centring. This symbol may be dependent
on the coordinate system chosen.
Data Type 
- Data type code
- char
- Data type detail
- char item types / multi-word items ...
- Primitive data type code
- char
- Regular expression
- [][ \t_(),.;:"&<>/\{}'`~!@#$%?+=*A-Za-z0-9|^-]*
Controlled Vocabulary
| Allowed Value | Details |
|---|---|
| A | a face centred (0,1/2,1/2) |
| B | b face centred (1/2,0,1/2) |
| C | c face centred (1/2,1/2,0) |
| F | all faces centred (0,1/2,1/2),(1/2,0,1/2),(1/2,1/2,0) |
| H | hexagonal centred (2/3,1/3,0),(1/3,2/3,0) |
| I | body centred (1/2,1/2,1/2) |
| P | primitive no centring |
| R | rhombohedral obverse centred (2/3,1/3,1/3),(1/3,2/3,2/3) |
| Rrev | rhombohedral reverse centred (1/3,2/3,1/3),(2/3,1/3,2/3) |
Controlled Vocabulary at Deposition
| Allowed Value | Details |
|---|---|
| A | a face centred (0,1/2,1/2) |
| B | b face centred (1/2,0,1/2) |
| C | c face centred (1/2,1/2,0) |
| F | all faces centred (0,1/2,1/2),(1/2,0,1/2),(1/2,1/2,0) |
| H | hexagonal centred (2/3,1/3,0),(1/3,2/3,0) |
| I | body centred (1/2,1/2,1/2) |
| P | primitive no centring |
| R | rhombohedral obverse centred (2/3,1/3,1/3),(1/3,2/3,2/3) |
| Rrev | rhombohedral reverse centred (1/3,2/3,1/3),(2/3,1/3,2/3) |