The 1H region of HYSCORE spectra at 10 K. Measurements near gz at g=2.40 (290 mT) with microwave frequency ~973 GHz and τ=160 ns. Left: resting nNOSOX(−BH4, −l-arg), Center: nNOSFQ(+BH4, −l-arg), and Right: nNOSOX(−BH4, +l-arg), although noisier, this spectrum is not significantly different from the other two. Relative signal intensity within each spectrum is indicated by color from blue through red which is the maximum intensity in each displayed spectrum.