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The Carver and Richards 1972 2site relaxation dispersion model for SQ CPMGtype data for most time scales whereby the simplification R _{2A}^{0} = R _{2B}^{0} is assumed. This model is labelled as CR72 in relax.
Equation
Please see the summary of the model parameters here.
[math]
R_{2,\textrm{eff}} = \frac{R_2^A+R_2^B+k_{\textrm{EX}}}{2}  \nu_{\textrm{cpmg}} \cosh^{1} (D_+\cosh(\eta_+)  D_\cos(\eta_)) \\
\phantom{R_{2,\textrm{eff}}} = R_2 + \frac{k_{\textrm{EX}}}{2}  \nu_{\textrm{cpmg}} \cosh^{1} (D_+\cosh(\eta_+)  D_\cos(\eta_))
[/math]
Which have the following definitions
[math]
\zeta = 2 \Delta \omega \, (R_2^A  R_2^B  p_A k_{\textrm{EX}} + p_B k_{\textrm{EX}}) \\
\phantom{\zeta} =  2 \Delta [[CR72..→]]
[/math]



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