set terminal postscript enhanced set key left top set title "3-D Interpolation Timing Data, order 4" set xlabel "Number of Extra Points, S_k" set ylabel "Average Interpolation Time (s)" set yrange [0.0:0.15] plot 'time.out' u 1:4 t 'Resolution 1' w lp, \ '' u 1:8 t 'Resolution 2' w lp, \ '' u 1:12 t 'Resolution 3' w lp;