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Arrhenius plots of the observed first-order rate constants for the decay of the CoII-substrate radical pair, kobs,m, kobs,f, and kobs,s. The combined kobs,m and kobs,f values (solid circles) are fitted by the upper line. The kobs,s values corresponding to 190 ≤ T ≤ 207 K (solid squares) are fitted by the lower line. The kobs,s value for 210 K (open square) is not included in the fit. The data are from Table 1. The fitting parameters are presented in Table 2.
