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The drawing shows a two-wire transmission line connecting nodes of a generator with nodes of a load. The generator shows a voltage source, V-tilde sub g with an impedance Z sub g, while the load impedance is labeled Z sub L. The transmission line has length l, with load terminals marked at z equals 0 and generator terminals labeled z equals negative l. The voltage at generator terminals is V-tilde sub i while the same at load terminals is V-tilde sub L. The input and output currents at the generator and load terminals are respectively labeled I-tilde sub i and I-tilde sub L.