set title '2-D Interpolation Error Data, Order 5'

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, \
     ''        u 1:17 t 'Resolution 4' w lp;