set terminal postscript enhanced
set key left bottom
set title "3-D Interpolation Error Data, order 5"
set xlabel "Number of Extra Points, S_k"
set ylabel "RMS of total error"
set log xy
plot 'rms.out' u 1:5 t 'Resolution 1' w lp, \
'' u 1:9 t 'Resolution 2' w lp, \
'' u 1:13 t 'Resolution 3' w lp;