set terminal postscript enhanced
set key left bottom
set title "3-D Interpolation Error Data, order 3"
set xlabel "Number of Extra Points, S_k"
set ylabel "RMS of total error"
set log xy
plot 'rms.out' u 1:3 t 'Resolution 1' w lp, \
'' u 1:7 t 'Resolution 2' w lp, \
'' u 1:11 t 'Resolution 3' w lp;