HYSCORE spectrum of the hSO Pi form collected at the gy position. Experimental conditions: mw frequency = 9.51 MHz; Bo = 344.8 mT; time interval between the 1st and 2nd pulses = 180 ns; mw pulses, 11, 11, 13, 11 ns; temperature, 21 K. The 31P Zeeman frequency, νp, is indicated by dashed lines. The 31 P cross peaks are marked by arrows, and the magnitude of hfi, evaluated from their position, spreads between 4 and 11 MHz.