EPR spectra (colored traces) and simulations (black traces) of nitrosocyanin, pH 7 in KPi, KCl. (A) As isolated, (D) after EDTA treatment and gel filtration. Experimental conditions: Temperature 15 K; microwaves 0.002 mW at 9.618 GHz. Simulation: S=1/2, g-values as listed, (B) Az=600 MHz (19.4 mT) or (C) 430 MHz (13.8 mT) for I=3/2.