%% auteur : 

80 setxunit
-1 6.8  setxrange
-1 3  setyrange


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%  DANGER !! Il ne faut pas utiliser de variables
%%  DANGER !! qui commence par les lettres :
%%  DANGER !! xmin, xmax, ymin et ymax...
%%  DANGER !! Utiliser x_min, y_min...
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%




%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% procédures
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


%% on donne ici x(t)
/xdet {
1 dict begin
	/t exch def
	t
end
	} def

%% on donne ici y(t)
/ydet {
1 dict begin
	/t exch def
	t dup mul dup 1 add div t abs sqrt mul 0.5 sub 1.5 mul t 0.1 mul add
end
	} def


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% définitions des couleurs
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% tracés
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%% tracé des axes et du point Origine
1 setlinewidth
15 setfontsize
noir
continu
traceaxes
%marks
%tracerepere
axesarrow


1.5 setlinewidth

[0.5 1.6 2 1.6] (-) ligne
[2 0.8 2.8 0.8] (-) ligne
[2.8 2 3.6 2] (-) ligne
[3.6 1.3 4.4 1.3] (-) ligne
[4.4 0.2 5.7 0.2] (-) ligne

[0.5 2.2 2 1.3 2.8 0.4 3.6 2 4.4 1.8 5.7 0.3] points


1 setlinewidth
pointilles
[0.5 0 0.5 2.2] (-) ligne
[2 0 2 1.6] (-) ligne
[2.8 0 2.8 2] (-) ligne
[3.6 0 3.6 2] (-) ligne
[4.4 0 4.4 1.8] (-) ligne
[5.7 0 5.7 0.3] (-) ligne

[0 1.6 0.5 1.6] (-) ligne
[0 0.8 2.8 0.8] (-) ligne
[0 2 3.6 2] (-) ligne
[0 1.3 3.6 1.3] (-) ligne
[0 0.2 5.7 0.2] (-) ligne



/fillstyle {hachure} def
continu
0.5 2 {1.6} Hachcourbe
2 2.8 {0.8} Hachcourbe
2.8 3.6 {2} Hachcourbe
3.6 4.4 {1.3} Hachcourbe

4.4 5.7 {0.2} Hachcourbe





<tex>
  $a=a_0$
</tex>
0.5 0 [1.5 1.5]dctexlabel

<tex>
  $a_1$
</tex>
2 0 [1.5 1.5]dctexlabel

<tex>
  $a_2$
</tex>
2.8 0 [1.5 1.5]dctexlabel

<tex>
  $a_3$
</tex>
3.6 0 [1.5 1.5]dctexlabel
<tex>
  $a_4$
</tex>
4.4 0 [1.5 1.5]dctexlabel

<tex>
  $a_5=b$
</tex>
5.7 0 [1.5 1.5]dctexlabel


<tex>
  $\lambda_0$
</tex>
0 1.6 [1.5 1.5] cltexlabel

<tex>
  $\lambda_1$
</tex>
0 0.8 [1.5 1.5] cltexlabel

<tex>
  $\lambda_2$
</tex>
0 2 [1.5 1.5] cltexlabel

<tex>
  $\lambda_3$
</tex>
0 1.3 [1.5 1.5] cltexlabel


<tex>
  $\lambda_4$
</tex>
0 0.2 [1.5 1.5] cltexlabel