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Peak-to-peak amplitude of the central nitroxide line as a function of microwave power for progressive saturation measurements on LHCIIb mutants S52r (a) and V196r (b) at 295 K. •, N2; ▾, N2/(Cr(ox)3)3−; ■, 20% O2 (air). Solid lines are fits by Eq. 1.
