traceaxes
axesarrow
%%unites
%%ticks
%%tracerepere
%%marks

%%quadrillage

-0.5 7 setxrange
-1 5 setyrange

/f {setxvar
#rpn# x - 1
} def

/g {setxvar
#rpn# 0
} def

/strike {3 0} def

/alphatext {4.5 2.5} def
/alpha1 {3 2} def
/alpha2 {6 2} def

/payoff {0 5} def
/st {7 0} def

<tex>
$$
pay-off
$$
</tex>
payoff [1.5 1.5] drtexlabel

<tex>
$$
S_T
$$
</tex>
st [1.5 1.5] dltexlabel

mixte
alpha1 alpha2 (-) line

continu
0 45 alpha1 1 Cercle

<tex>
$$
\alpha
$$
</tex>

alphatext [1.7 1.7] cltexlabel

<tex>
$$
K
$$
</tex>

strike point 
strike [1.7 1.7] urtexlabel

continu
rouge
3 15 {f} (\]-*) Courbe
bleu
0 3 {g} (\]-\]) Courbe