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Fourier spectra of the first sub-pulse (a) and the remote part (c) of the PWM_1.5 signal in the frequency range ν = [2.8, 3.2] THz; integral characteristics CWp,P(tn) detecting the frequencies ν = 3.0 THz (b); 3.01 THz (d) in the time intervals t = [40,70] ps (b) and t = [70,170] ps (d).
