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

%%quadrillage

-0.5 7 setxrange
-1 5 setyrange

/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

/f {setxvar
#rpn# 1
} def

/g {setxvar
#rpn# 0
} def

/strike {3 0} def

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

strike point 
strike [1.5 1.5] ultexlabel

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