This model is provided for model selection purposes. In combination with frequentist methods, such as AIC, or Bayesian methods it can show if the presence of chemical exchange is statistically significant. Optimisation is still required as one R20 value per magnetic field strength will be fit to the measured data for each spin system. If off-resonance CPMG or R1ρ data is being used, then one of the following equations will be fit:
The R1 value can either be fixed to loaded experimental values or optimised. It is selected by setting the model to `No Rex'.
More information about the No Rex model is available from the:
The relax user manual (PDF), created 2019-03-08.