gnuplot for time series queue lengths

gnuplot_nym.conf

#set terminal png size 1200,800
set xdata time
set timefmt "%H:%M:%S"
set format x "%H:%M"
set output "load.png"
# time range must be in same format as data file
#set xrange ["08:20:00":"08:50:00"]
#set yrange [0:50]
set grid
set xlabel "Time"
set ylabel "Queue Length"
set title "Nym"
#set key left box
plot "nymcoherencequeue.dat" using 1:2 index 0 title "Nym" with lines