Last time i saw some mrtg graphs that calculated the total of traffic transfered and showed it in gigabytes in a "bar" diagram(not sure how to call it).
The guys the pics were from say it's a mrtg add on, but don't want to say what it is.
Any ideas since i would like to use this tool.

http://people.ee.ethz.ch/~oetiker/webtools/rrdtool/

or

http://my14all.sourceforge.net/

re good add ons and can do this.

I forgot the example,
this is it
http://www.idomein.nl/gameservergb.jpg

Thats a nice graph! i could do with that addon, anyone help.... ?