<math>
\tau_{\textrm{CP}} = \frac{1}{4\nu_\textrm{CPMG}} \\
\alpha_- = \Delta R_2 - + k_{\textrm{BAAB}} + - k_{\textrm{ABBA}} \\
\zeta = 2 \Delta \omega \, \alpha_- = h_1\\
\Psi = \alpha_-^2 + 4 k_{\textrm{AB}} k_{\textrm{BA}} - \Delta \omega^2 = h_2\\