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Time-averaged DAS signal spectra along the fiber recorded for 1 mm leak at 5 bars and averaged over different acquisition times. Signals from fiber dead-zones between the monitored pipe zones are discarded, i.e., set to zero. Label acquisition times of 0.3 s, 3 s and 30 s correspond to spectral averaging over 3, 29 and 292 short-time fast Fourier transform (STFFT) windows.
