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The horizontal axis plots z, and marks l over 2 and l, while vertical axis plots V (z, 5 T over 2), and marks V sub 1-plus which is lesser than V. The graph plots a square-waveform between 0 and l over 2, with amplitude labeled V sub 1-plus plus V sub 1 minus plus V sub 2 - plus. Here V sub 2 plus equals gamma sub G times V sub 1 minus. The waveform steps-down to V sub 1-plus plus V sub 1 -minus between l over 2 and l before dropping to zero at l.