Data Item _chem_shift_ref.external_ref_axis
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General 
- Item name
- _chem_shift_ref.external_ref_axis
- Category name
- chem_shift_ref
- Attribute name
- external_ref_axis
- Required in PDB entries
- no
- Used in currrent PDB entries
- No
Item Description
The axis of the external chemical shift reference sample relative to the
static field (Bo) of the spectrometer.
Item Example
parallel; perpendicular
Data Type 
- Data type code
- line
- Data type detail
- char item types / multi-word items ...
- Primitive data type code
- char
- Regular expression
- [][ \t_(),.;:"&<>/\{}'`~!@#$%?+=*A-Za-z0-9|^-]*
- Values limited by enumeration list
- no
Controlled Vocabulary
| Allowed Value | Details |
|---|---|
| magic angle | |
| na | |
| parallel | |
| perpendicular |
Controlled Vocabulary at Deposition
| Allowed Value | Details |
|---|---|
| magic angle | |
| na | |
| parallel | |
| perpendicular |