set key graph 0.4,0.95
set label "2B" at graph 0.02,0.95
set xlabel "pieces"
set ylabel "time (seconds)
set terminal fig big thickness 1 fontsize 18
set pointsize 1
plot "trial2B.plt" index 0 t "version-2" with linespoints pointtype 1
replot "trial2B.plt" index 1 t "version-3" with linespoints pointtype 5
set output "trial2B.fig"
replot