Fig. 4. (Color online) (a) Cable sheath sample of an underground transmission line (b) Terahertz pulses transmitted through air (black) and sample (red). (c) Transmitted amplitude (upper) and phase difference (lower) obtained by Fourier transform of terahertz pulse data. (e) Real (solid line) and imaginary (dotted line) parts of complex refractive index of the sample.
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