%% Figure 4
I_t: time trace of SET-current on Coulomb peak slope
I_t_back: time trace of SET-current in Coulomb blockade
Vp: P gate voltage in mV (inset)
I_dot: DC current through QD as a function of P gate voltage (inset)

The time traces are measured at a sampling rate of 30.5 kHz. 
The FFT spectrum is obtained by decomposing the trace into 15 equal length traces and averaging the individual FFTs.
Delta_E is obtained from: Delta_E = Vp*alpha, with the lever arm alpha=0.03.
A current offset in the measurement electronics of 8pA is subtracted from I_dot.
The current noise spectrum is converted to an energy noise spectrum by: FFT_I / gamma^2, with gamma=3.6E5 the slope of the coulomb peak in A/eV.