This is the model for 2-site fast exchange for on-resonance R1ρ-type data. It is selected by setting the model to `M61', here named after Meiboom (1961). The equation for the exchange process is
|R1ρ = R1ρ' + .||(11.73)|
The reference for this equation is:
More information about the M61 model is available from:
The relax user manual (PDF), created 2016-10-28.