[mrtg] Faint red line - how/what/why?

[Dave Whitehead]

Silly question.....which I probably should know the answer to ! 8-)
 
On *some* of my MRTG generated graphs there is a faint dotted red line
running horizontally. It doesnt seem to be related to either of the
plotted values and so far I cant see where its coming from.
 
Can someone enlighten me?
 
Many thanks
Dave Whitehead
 
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