Are all traces captured by dag card in "tcpdump" format?

["ice ice" <wildicecoco () hotmail com>]

Hi,
I have a trace saying

"Data provided by WAND Research Group using the dag interface card
OC48 data analysis required CAIDA's CoralReef software suite."

I am confused by the statement of "OC48 data analysis required CAIDA's 
CoralReef software suite".

It seems to me that traces captured by dag card are collections of packet 
headers. And I can use Tcpdump or CoralReef libary in reading the packet 
information from the trace. And I even can directly read header by header 
(IP+TCP/UDP/or other+..) from the trace by my own program, and interpret the 
information in packet by matching the structure specified in RFC.

Then why "OC48 data analysis required CAIDA's CoralReef software suite"?

I apply the tcpdump on the trace, it also can print out the packet 
information. But when I write my own program to parse through the trace, I 
can not get right information. Why is that?

Thanks,
zs

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