Throughput Graph vs I/O Graph differences

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Hello!

When I use the I/O Graph (1-sec interval) for a specific flow I see ~2Mbps maximum.

When I use the Throughput Graph (1-sec MA Window) for the same flow I see ~3Mbps maximum (I am checking the direction that has all the traffic).

I can only see the Throughput Graph matching the I/O Graph if I change the MA Window to 2 sec.

Why there is a discrepancy between the two graphs when I check the 1-sec interval (default)?