[ns] How to plot the throughput of a link ?

[Meow Chiow Chia <meowchiowc@yahoo.com>]

Hi all ns-users
    I am learning the ns-2 from the Marc Greis's
tutorial document.  I am just wondering how can I plot
the throughput of an aggregate link using xgraph.  For
example, I want to plot the throughput of the link
between n2 and n3 as follow, 
 
         
 n0 ------- n2-------n3
            |
  n1 -------|

 I understood from the Marc's tutorial that I need to
create a traffic sink , but how can I plot the
throughput of a aggregate link (Marc showed an example
with 3 separate traffic sinks for 3 sources). I have
tried to look for the solution in the ns manual but
apparently the manual is not that useful for a
beginner like me.
   Any help on this will be very much appreciated.

Many Thanks
Meow


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