set title '2-D Interpolation Error Data, Order 3'
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, \
'' u 1:15 t 'Resolution 4' w lp;