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What does the blue lines mean?

I cann’t find out any point for the blue lines in the picture.

Or is there any clue I can follow?

The traffic is Server->Statistics->All Reports->Server Traffic.

The pluign named Load Statistic is needed.

I assume it is either IN or OUT traffic, one may need to lookup the source code or javadoc.

The orange one may be IN, and the blue one may be OUT.

Great hypothesis.