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Hahn-echo transverse relaxation rate constant for 2-site chemical exchange with p2 = 0.08 and R21 = R22 = 0. (black, solid) Exact R2 given as the real part of eigenvalue for free-precession (Eq. 11) and Hahn-echo for single spin-echo with total time (blue, dashed) t = 25/Δω21, (orange, dotted) t = 10/Δω21, and (green, dash-dotted) t = 5/Δω21.
