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It would be helpful if you would post the 'scope settings (volts per division & sweep speed) as well as the picture... Hard to tell if the ringing here is significant... perhaps it is a millivolt, perhaps it is 10 volts, we can't tell. I suspect that you are using a very sensitive vertical setting, and those random traces flying by are perhaps from pulses (vertical?) that are much larger, and off screen.
jr
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