[mrtg] How to graph from +30 to - 30

[Joshua Krause]

I am trying to graph Recieve Pwr off of some cable modem routers.  And
the value can range anywhere from +30 to -30.  And i was wondering how i
would setup mrtg to graph that?  Has anyone tried setting this up
before?  And if so can i get some assistance with it?

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