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Code trace question

In my trace file, I found some "r" code. I don't found this code in the
doc.
What does this code mean?

Thanks,
Anne-Marie.


-----------The bedinning of my trace file -------------------------
+ 0 7 1 tcp 1000 ------- 0 7.0 0.5 0 0
- 0 7 1 tcp 1000 ------- 0 7.0 0.5 0 0
+ 0 8 1 tcp 1000 ------- 0 8.0 0.6 0 1
- 0 8 1 tcp 1000 ------- 0 8.0 0.6 0 1
+ 0 3 1 tcp 1000 ------- 0 3.0 0.1 0 2
- 0 3 1 tcp 1000 ------- 0 3.0 0.1 0 2
+ 0 4 1 tcp 1000 ------- 0 4.0 0.2 0 3
- 0 4 1 tcp 1000 ------- 0 4.0 0.2 0 3
+ 0 5 1 tcp 1000 ------- 0 5.0 0.3 0 4
- 0 5 1 tcp 1000 ------- 0 5.0 0.3 0 4
+ 0 6 1 tcp 1000 ------- 0 6.0 0.4 0 5
- 0 6 1 tcp 1000 ------- 0 6.0 0.4 0 5
r 0.03325 7 1 tcp 1000 ------- 0 7.0 0.5 0 0
+ 0.03325 1 0 tcp 1000 ------- 0 7.0 0.5 0 0
- 0.03325 1 0 tcp 1000 ------- 0 7.0 0.5 0 0
r 0.03325 8 1 tcp 1000 ------- 0 8.0 0.6 0 1
+ 0.03325 1 0 tcp 1000 ------- 0 8.0 0.6 0 1
r 0.03325 3 1 tcp 1000 ------- 0 3.0 0.1 0 2
+ 0.03325 1 0 tcp 1000 ------- 0 3.0 0.1 0 2
r 0.03325 4 1 tcp 1000 ------- 0 4.0 0.2 0 3
+ 0.03325 1 0 tcp 1000 ------- 0 4.0 0.2 0 3
r 0.03325 5 1 tcp 1000 ------- 0 5.0 0.3 0 4
+ 0.03325 1 0 tcp 1000 ------- 0 5.0 0.3 0 4
r 0.03325 6 1 tcp 1000 ------- 0 6.0 0.4 0 5
+ 0.03325 1 0 tcp 1000 ------- 0 6.0 0.4 0 5



----------------- The code part of the doc
------------------------------
     The tracefile format is backward compatible with the  output
     files  in  the  ns  version  1  simulator so that ns-1 post-
     processing scripts can still  be  used.   Trace  records  of
     traffic  for  link objects with Enque, Deque or Drop Tracing
     have the following form:

              <code> <time> <hsrc> <hdst> <packet>

       where

            <code> := [hd+-] h=hop d=drop +=enque -=deque
--
------------------------------------------------------------------------
Anne-Marie Bustos, [email protected],
FT/BD/CNET/DSE/ISE
Phone:(33) 04.92.94.52.25 -  CNET, 06921 Sophia-Antipolis CEDEX, FRANCE.