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In a recent paper , a method for the time-domain characterization of lossless multiconductor transmission lines with cross sectionally inhomogeneous dielectrics was presented. This method is limited to lines with completely nondegenerate propagation; i.e., all the modes have distinct propagation velocities. In this paper, a method is presented for the characterization of lossless partially degenerate three-conductor lines, together with experimental data. The results are in good agreement with independent frequency-domain measurements.