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      1 $6 !~ /^ack/ && $5 !~ /[SFR]/ 	{
      2 	# given a tcpdump ftp trace, output one line for each send
      3 	# in the form
      4 	#   <send time> <seq no>
      5 	# where <send time> is the time packet was sent (in seconds with
      6 	# zero at time of first packet) and <seq no> is the tcp sequence
      7 	# number of the packet divided by 1024 (i.e., Kbytes sent).
      8 	#
      9 	# convert time to seconds
     10 	n = split ($1,t,":")
     11 	tim = t[1]*3600 + t[2]*60 + t[3]
     12 	if (! tzero) {
     13 		tzero = tim
     14 		OFS = "\t"
     15 	}
     16 	# get packet sequence number
     17 	i = index($6,":")
     18 	printf "%7.2f\t%g\n", tim-tzero, substr($6,1,i-1)/1024
     19 	}
     20