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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 R02A = R02B is assumed. It has the parameters {R02, ..., pA, ∆ω, kex}. The implementation of the [http://www.nmr-relax.com/manual/reduced_CR72_2_site_CPMG_model.html CR72 in relax] can be seen in the [http://www.nmr-relax.com/api/3.1/lib.dispersion.cr72-module.html API documentation].