Extended T1/T2 relaxation superoperators.
Returns the relaxation superoperators separately for the longitudinal and the transverse states.
R1Op - relaxation superoperator containing all longitudinal relaxation terms R2Op - relaxation superoperator containing all transverse relaxation terms
Multi-spin orders relax at the sum of the rates of their constituent single-spin orders.
Version 2.1, authors: Ilya Kuprov