#!/usr/bin/gnuplot
set terminal postscript eps font 'Helvetica'
set output 
unset border
unset key
set size 0.5,0.5
set zeroaxis lt -1 lw 2
set xtics axis -1.5,0.5,0.5
set ytics axis 0,1,3
quadra(x) = x*x+x+1
set label 1 at 0,1 point pt 7 ps 1.5
set label 2 at -0.5,0.75 point pt 6 lw 1.5 ps 1.5
set label 3 at 1.0,0.3 "p"
set label 4 at 0.1,3.3 "C(p)U"
set arrow 1 from 1.0,0 to 1.2,0 filled size 0.1,15,60 lw 2
set arrow 2 from 0,3.5 to 0,3.7 filled size 0.1,15,60 lw 2
set arrow 3 from 0,1 to -0.2,0.8 filled size 0.1,15,60 lw 1
plot [-2:1.2] [-1:3.7]  quadra(x)