[ns] What's the diference between these two delay?

[Anaking <anaking@sina.com>]

First, I use "$flow get-delay-samples" 
	  set fcl1 [$fmon1 classifier]
	  set flow [$fcl1 lookup auto 0 0 $i]
	  set dsamp [$flow get-delay-samples]
Second, I use the awk file provided to process the trace file

But there is great discrepancy between the delay results.
I wonder what these two delay mean.

Thanks.