How to plot Resultant Mag Field on Data Log Browser

ArduCopter Copter 4.3
1

How do I plot the resultant mag field, sqrt(magx^2+magy^2+magz^2) on Mission Planner Log Browser? I’ve seen folks do this, but I’m not sure how to plot equations:

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2

Here is an example of someone who plotted resultant mag field:

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3

There’s a dropdown menu between Show Parameters and the check box for Mode. In that menu look for Sensors/Compass/Compass mavgraphs.

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