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Request advice on data captured from AD6655-125EBZ

Input signal : 60Mhz, 2Vp-p / Clock Frequency : 96Mhz, 2Vp-p
Samples : 131072  /  Capture Board Time : 1000ms (Maximum Poll Time)

capture_datacapture_data zoom

After conducting the test under the above conditions, the data was checked on the PC.
I want to know what is happening with the red circle in the graph.

I would like your advice.

Thank you.