Normalized charge sensor signal I sensor for a CPMG sequence with 4 decoupling pulses as a function of the spacing between two subsequent decoupling pulses tau and theta B . N tau is the total evolution time. phi B = 97.5° and B = 133 mT. The inset displays the fit to the data from which we extract S 0,HF ( theta B ) and S 0,E ( theta B ) ( Methods ).
