[rrd-users] Inverted graphs?

[Mike Warren]

I'm trying to make an inverted graph similiar to:

http://people.ee.ethz.ch/~oetiker/webtools/rrdtool/gallery/alex-01.html

... but I have not having much luck.  I don't need all the fancy
calculations I don't think, I just want to basically have a graph where
the positive side (the top) is outgoing bandwidth and the negative side
(the bottom) is incoming bandwidth.  

I am speculating all that I need to do is somehow turn my bandwidth
number for incoming into a negative number but I'm not sure exactly how
to do that.

Suggestions?

- Mike

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