code: def dual(ABF):
      
      new(ABF)
      pylab.subplot(211)
      pylab.title("Input A (channel 0)")
      ABF.channel=0
      sweep(ABF)
      pylab.subplot(212)
      pylab.title("Input B (channel 1)")
      ABF.channel=1
      sweep(ABF)
docs: Plot two channels of current sweep (top/bottom).