FIGURE 3. The contour plots of 15 N-HYSCORE spectrum of the SQ in the Qi-site of the uniformly 15 N-labeled bc1 complex.

The spectrum was determined as described under “Experimental Procedures,” with the time between first and second microwave pulses τ = 200 ns; microwave frequency, 9.705 GHz, magnetic field, 345.8 mT, temperature, 90 K.