This folder contains the data used to draw the figures in the main article.
Fig1_time_trace.dat
The first column indicates the time axis for the time-domain measurement (in ps). The second column is the electric field amplitude measured for the reference sample. The third column in the electric field amplitude measured for the sample A1. The amplitudes are in arbitrary units.

Fig1_FFT_amplitude.dat
The first column indicates the frequency (is THz). The second column is the spectral amplitude measured for the reference. The third column in the spectral amplitude measured for the sample A1. The spectral amplitudes are in arbitrary units.

Fig2_FFT_amplitude.dat

The first column indicates the frequency (is THz). The second and the third columns contain the absorption coefficient (alpha) in cm^(-1) for the sample A1 with (2nd) and without (3rd) the correction for removing the Fabry–Pérot oscillations. The third column shows the fit with the frequency-squared function.

Fig3_FFT_amplitude.dat
The first column indicates the frequency (is THz). The columns 2-10 contain the absorption coefficient (alpha, cm^(-1)) values for: A1, B1, A3, N1, P2REF (unaged), P2V06, P2V12, P2V24, P2V47 samples, respectively.

Fig4.dat
The first column indicates the frequency (is THz). The columns 2-10 contain the absorption coefficient (alpha, cm^(-1)) values for: A1, B1, A3, N1, P2REF (unaged), P2V06, P2V12, P2V24, P2V47 samples, respectively.  These are obtained by subtraction of the backgrounds from the curves reported in Fig3_FFT_amplitude.dat in the range 1–3.3 THz as explained in the main text. 
Column 11 contains the values of the frequency (THz) used for the plot in panel c, of figure 4. Column 12 contains the corresponding amplitudes.