| Open scope and paste this script into the
        command window. Then press <Ctrl + R> to plot a square wave
 Select the Calculator menu "Build/Pulse/Complex/FFT 
              init/FFT 256 point. then press f to get the 256 point transform. numpoints = 256
 time = (vector(numpoints)/(numpoints-1)*1m)
 newplot pulseplot time
 setplot pulseplot
 y = 2*pulse(500u) - 1
 plot y
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