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Spy lines: The motherboards for the beamtest had 'spy lines'
connected to a few channels. There were spy lines at the preamp/integrator
output, and at the AMU output. This picture from the digital oscilloscope
shows both lines. A jump in the integrator output shows an event occurred.
Two charge samples were taken before and after the transition, 400 ns
apart (which is small on the 50 us/div scale of this display).
Subsequently a trigger prompted the AMU to retrieve the two charge
samples from its analog memory, and they appear on the AMU spy line.
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