set terminal postscript landscape monochrome "Helvetica" 16
set output 'poly3.ps'
x1(u) = u
x2(u) = u*log(u)
x3(u) = u*u
x4(u) = u*u*u
x5(u) = 2**u
x6(u) = sqrt(u)
x7(u) = log(u)
set label 1 "y=n*n*n" at 6,200
set label 3 "y=2**n" at 7,100
set nokey
set label 4 "y=n*n*n" at 13,2000
set title "Polynomial vs exponential behaviour for small n"

plot  [u=0:8] x4(u), x5(u)
set terminal X11
replot