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EPR powder spectrum of 
in H2O. Insets show the quinone orientations with respect to the magnetic field corresponding to gx, gy, and gz. Experimental conditions: T = 80 K, MW frequency = 35.03 GHz, MW power = 1 × 10−7 W, field modulation = 0.15 mT peak-to-peak at 270 Hz, average of 9 scans, 20 s per scan.
