# fichier prst9709.plt pour gnuplot
  set terminal latex
  set output   "prst9709.txp"
# set title "Repr\'{e}sentation de $G$"
  set sample   1500
  set size 1/2.,4/6.
  set nokey
  set xrange   [0:4]
  set yrange   [0:0.85]
  set xtics ("1" 1,"3" 3)
  set ytics ("0" 0,"1/4" 0.25,"1/2" 0.5,"3/4" 0.75,"1" 1)
  p(x) = (-3*x*x+12*x-7)/8
  f(x) = (x<1 ? 0 : (x>3 ? 0 : p(x) ) )
  g(x) = 0.25
  plot f(x) , g(x) with lines 4
  set terminal windows
# replot
# pause -1  "Hit return to continue"