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The graph plots the absolute value of V-tilde of d along the vertical axis, and d along the horizontal axis, ranging from lambda to lambda over 4 in decrements of lambda over 4. Two half-sinusoidal waves are plotted between the voltages of 0 and 2 times the absolute value of V-plus sub 0, for Z sub L equals 0. The half-sinusoidal waves hit peak-voltage at d equals lambda and lambda over 2, and zero-voltage at d equals 3 over 4 lambda and lambda over 4.