= Intro =
The relaxation dispersion model for determining the $R_{2,eff}$ or $R_{1\rho}$ values used as the base data for all other dispersion models. This if for all [[SQ CPMG-type data]], [[:Category:MMQ CPMG data|MMQ CPMG-type data]], and [[R1rho-type data]]. This model is labelled as '''R2eff''' in [[Relaxation dispersion citation for relax|relax]].