Can I use MRTG to show the cumulative bandwidth of all servesr together?

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http://serverfault.com – I am currently using MRTG to graph the bandwidth of my servers. It is working well, however I have only the bandwidth chart for each individual server/network interface. I would like to have one chart with all interfaces combined stacked on top of another, so I can see the total throughput of my servers together. Is mrtg to do that? (HowTos)