Trace files format

[Sherif Rizkalla <srizkall@mozart.gmu.edu>]

Hi everybody,
I'm a new ns user, and I was a bit confused by the trace file formats..
All the documentations I have found said that '+' is enqueue, '-' is
dequeue, and 'd' is for drops.
But every simulation I ran so far, as well as the examples (ns2.1b2) had
'+', '-' and 'r' (no 'd').. So I assume the 'r's are drops, but the rate
was so high that you could say almost 90% of the packets are dropped.
Any ideas?
Thanx

-Sherif