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

plot 'rms.out' u 1:2  t 'Resolution 1' w lp, \
     ''        u 1:6  t 'Resolution 2' w lp, \
     ''        u 1:10 t 'Resolution 3' w lp, \
     ''        u 1:14 t 'Resolution 4' w lp;