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The Carver and Richards 1972 2-site relaxation dispersion model for [[SQ CPMG-type data]] for most time scales whereby the simplification R20A = R20B is assumed. It This is labelled as '''CR72''' in relax. == Parameters == The CR72 model has the parameters {R20$R_2^0$, $...$, pA$p_A$, ∆ω$\Delta\omega$, kex$k_{ex}$}.  == Reference == The reference for the CR72 model is: * Carver, J. and Richards, R. (1972). General 2-site solution for chemical exchange produced dependence of T2 upon Carr-Purcell pulse separation. ''J. Magn. Reson.'', '''6'''(1), 89-105. ([http://dx.doi.org/10.1016/0022-2364(72)90090-X 10.1016/0022-2364(72)90090-X]).  == Links == The implementation of the MP05 model in relax can be seen in the:* [http://www.nmr-relax.com/manual/reduced_CR72_2_site_CPMG_model.html CR72 model in relaxmanual] can be seen in the ,* [http://www.nmr-relax.com/api/3.1/lib.dispersion.cr72-module.html API documentation].