I am new to NS2 and had installed ns-2.34 on ubuntu-9.1.
    I was trying to run the example for plotting the graph given in Marc
   Greis tutorial, mentioned in Section VIII:Creating output files for
   Xgraph.
    I downloaded the exact example mentioned in the tutorial. But when I
   run the program, I get the following error:
    ns: finish: couldn't execute "xgraph": no such file or directory
       while executing
    "exec xgraph out0.tr out1.tr out2.tr -geometry 800x400 &"
       (procedure "finish" line 8)
       invoked from within
    "finish"
    Could you please help me to run the program.
    Thanks & Regards

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