Fig2c_data.mat contains all the data to generate Fig.2c, FFT 2D plot of the normalized FFT amplitude spectra as a function of accumulation gate and frequency at 1.7 K

 Vg [V] is the accumulation gate
 delta_rho_for_FFT is a cell array containing for each cell the 1/B [T^-1] and delta rhoxx [Ohm/sq.] data, column 1 and 2, respectively. Increasing Vg [V] from cell 1 to 38.
 FFT_2Dplot_f (f), FFT_2Dplot_Vg [V], and FFT_2Dplot_spectra_norm [a.u.] are the frequency, accumulation gate (Vg), and normalized spectra (spectra_norm) that generate the 2D plot, respectively
 FFT_f_density_Spectra_normSpectra is a cell array  containing for each cell frequency (f), density [cm^-2], FFT spectra [a.u.], and normalized spectra [a.u.], column 1 to 4, respectively. Increasing Vg [V] from cell 1 to 38.
 frequency_peaks and frequency_delta_peaks are two arrays containing the peaks frequency and their difference, respectively. Each row come from the corresponding cell position of delta_rho_for_FFT and FFT_f_density_Spectra_normSpectra
