_Chem_shift_ref.Ref_type
| Description | The reference type may be either direct (against a value measured with a chemical compound) or indirect (calculated from chemical shift ratios). |
| Details: | |
| Parent saveframe | chem_shift_reference |
| Data type | line |
| Allowed values | direct indirect |
| DB table | Chem_shift_ref |
| DB column | Ref_type |
| DB type | VARCHAR(127) |
| NULL allowed | yes |
| ADIT-NMR deposition system prompt | Reference type |