Unfortunately I haven’t used this tool yet myself so I’m watching with interest. I’ve considered re-tuning a couple of quads just to try this out.
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Sorry I missed your first post, but your in good hands.
Those graphs make up a “Bode plot”, with that key term you should be able to find lots of info.
The solid line is the average for the section of the log selected, the grey “shadow” is the range that it moves in as it is tracking throttle up and down.
Gotcha. This is kind of what I’m trying as well - got another crop of students this semester and thought I would show them the new tools! 
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No worries. Thanks again for this tool, as well as the hardware checker - both very useful! I’ll look into Bode plots - I appreciate the help!