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Experimental X-band EPR spectrum of [3(O)]+ at 4 K (ν = 9.38 GHz, Mod. Ampl. 0.5 mT, microwave power = 2 mW) (A) and calculated spectrum with g = 2.0, |A| 72 × 10–4 cm–1, D = –0.7 cm–1 and E/D = 0.10 (B).