1 set terminal postscript eps
2 set output "bench1.eps"
5 plot "bench1.1000.dat" title "isam 1000" with linespoints, \
6 "bench1.100.dat" title "isam 100" with linespoints, \
7 "bench1.10.dat" title "isam 10" with linespoints, \
8 "bench1.1.dat" title "isam 1" with linespoints