set key graph 0.4,0.95
set label "1B" 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 "trial1B.plt" index 0 t "version-1" with linespoints pointtype 1
replot "trial1B.plt" index 1 t "version-2" with linespoints pointtype 5
set output "trial1B.fig"
replot