Enumerations for _Auto_relaxation_list.Relaxation_coherence_type (An open enumeration)
`I-` | 'R1rho or R2 transverse'
`I+` | 'R1rho or R2 transverse'
`(I+)+(I-)` | 'R1rho or R2 transverse'
`((I+)+(I-))Sz` | 'single quantum antiphase'
`I-S-` | 'DQ relaxation'
`I-S+` | 'ZQ relaxation'
`I+S-` | 'ZQ relaxation'
`I+S+` | 'DQ relaxation'
`(I+S-)+(I-S+)` | 'ZQ relaxation'
`(I+S+)+(I-S-)` | 'DQ relaxation'
`I-Sz` | 'single quantum antiphase'
`I+Sz` | 'single quantum antiphase'
`Iz` | 'R1 longitudinal'
`IzS-` | 'single quantum antiphase'
`IzS+` | 'single quantum antiphase'
`Iz((S+)+(S-))` | 'single quantum antiphase'
`IzSz` | 'longitudinal spin order'
`S-` | 'R1rho or R2 transverse'
`S+` | 'R1rho or R2 transverse'
`(S+)+(S-)` | 'R1rho or R2 transverse'
`Sz` | 'R1 longitudinal'