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(a1–b2) Possible contributors to the compartments in the WL-PSI sequential model results for 670 nm excitation (a1 and a2) and 700 nm excitation (b1 and b2). Abbreviations are the same as in Fig. 1. See text for suggested assignment of the primary radical pair to P700+•A0−• and further details. In the (a2) case, (P700 A0)∗ is gray because this state could be present but not resolved spectrally in the current data.
