The type of magnetisation transfer between spectrum dimensions. Allowed values are:
- onebond: Any transfer that connects only directly bonded atoms in this experiment
- jcoupling: Transfer via direct J coupling over one or more bonds
- jmultibond: Transfer via direct J coupling over multiple bonds
- relayed: Transfer via multiple successive J coupling steps (TOCSY, relay, ...)
- relayed-alternate: Relayed transfer, where peaks from an odd resp. even number of transfer steps have opposite sign
- through-space: Any transfer that does not go through the covalent bonded skeleton (NOESY, ROESY, ... but also J coupling through hydrogen bonds)