plot_str=" plot '$trunc_file' using 1:3 with linespoints title 'free', '' using 1:4 with linespoints title 'erased'"
-echo "set title 'yaffs free space and erased space'"
+echo "set title 'yaffs free space vs erased space'"
+echo "set xlabel 'seconds'"
+echo "set ylabel 'chunks'"
+
echo $plot_str