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The circuit shows a two-line parallel transmission line connecting a voltage source, V sub g with impedance Z sub g to a load impedance, Z sub L. A rightward moving wave is labeled incident wave that moves along the z-direction of the transmission line, with voltage and current amplitudes labeled V-plus sub 0 and I-plus sub 0. A leftward moving wave is labeled, reflected wave that moves along the negative z direction, with voltage and current amplitudes labeled V- sub 0 minus and I- sub 0 minus.