Figure 6.8. This is a graph. The vertical axis goes from minus 1.5 to plus 1.5 and is labeled voltage. The horizontal axis goes from 0 to 5 and is labeled time. The voltage is zero from 0 to 0.5 seconds. At 0.5 seconds it suddenly switches to plus 1 volt where it remains until 1.5 seconds. At 1.5 seconds the voltage switches to zero where it stays until 2 seconds. At 2 seconds it switches to minus 0.5 volts. At 3.5 seconds it switches to zero. At 4 seconds it switches to minus 1.5 volts. At 4.5 seconds it switches to zero. It remains at zero until 5 seconds. End verbal description.
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