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Exchange broadening of methyl 13C spins in HP67. 13C R2,rc(1/τcp) relaxation dispersion profiles measured at static magnetic field strengths of (○) 14.1 T and (●) 18.8 T for (a)Val20 Cγ2, (b) Leu21 Cδ1, (c) Val22 Cγ1, and (d) Val33 Cγ2. The solid lines are fits to the data using (a) model 3, (b) model 2, (c) model 1, and (d) model 2 (see text for details).
