Hello ! :) >ns-2.1b5> nam out.tr >You are using the tracefile format older than 1.0a5 >which will not allow you to run namgraph >nam: badly formatted event at offset 39 in out.tr >nam: `+ 0 0 1 tcp 1000 ------- 1 0.0 1.0 0 0' >ns-2.1b5> I don't think you did something wrong ; I have the same display with some nam scripts .. but it works very well anyway ..