Data Item _pdbx_nmr_chem_shift_ref.external_ref_axis
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General 
- Item name
- _pdbx_nmr_chem_shift_ref.external_ref_axis
- Category name
- pdbx_nmr_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.
Additional Descriptive Information for Depositors
When external (capillary) is used as a referencing method, the axis of the external chemical shift reference sample relative to the static field (Bo) of the spectrometer.
Item Example
parallel
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|^-]*
Controlled Vocabulary
| Allowed Value | Details |
|---|---|
| parallel | |
| perpendicular |
Controlled Vocabulary at Deposition
| Allowed Value | Details |
|---|---|
| parallel | |
| perpendicular |