[ns] column select in xgraph

[kostas kapsal]

Hello everybody!
I'm using ns v2-27 with xgraph v12.1 as it is the default that comes with the package. I want to plot a graph from an output file and want to use the data from the  5 and 6 columns. I used the -columns option but seems that doesn't work for my version. 
Does anyone know how to select the 5 and 6 columns to plot the graph?

Thanks!

 		
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