-80 -60 -40 -20 0 20 40 30 20 10 0 Time (ms) 30 20 10 0 A B Membrane potential (mV)

Figure C.2 Filter Distortion. A. Snail action potential with the 60 Hz notch filter turned off. B. Action potential from the same cell with the notch filter turned on. Note the ringing oscillation following the potential.

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