traceaxes
%%unites
%%axesarrow
axeOxarrow
axeOyarrow
%%ticks
%%tracerepere
%%marks

%%quadrillage

-1 10 setxrange
-3 6 setyrange

/f {setxvar
#rpn# 2.5
} def

/g {setxvar
#rpn# x
} def

/h {setxvar
#rpn# 5
} def

/i {setxvar
#rpn# x
} def

/j {setxvar
#rpn# 2.5 - x
} def

/k {setxvar
#rpn# 5 - x
} def

rouge
0 2.5 {f} (-) Courbe
bleu
2.5 5 {g} (-) Courbe
vert
5 10 {h} (-) Courbe

mixte
noir

0 2.5 {i} (-) Courbe
0 2.5 {j} (-) Courbe
5 10 {k} (-) Courbe
5 10 {g} (-) Courbe

/k1 {2.5 0} def
/k2 {5 0} def

/p25 {0 2.5} def 
/p50 {0 5} def

/payoff {0 6} def
/st {10 0} def

<tex>
$$
K_1
$$
</tex>
k1 point 
k1 [1.7 1.7] dctexlabel

<tex>
$$
K_2
$$
</tex>
k2 point 
k2 [1.7 1.7] dctexlabel

<tex>
$$
25
$$
</tex>
p25 point
p25 [1.7 1.7] cltexlabel

<tex>
$$
50
$$
</tex>
p50 point
p50 [1.7 1.7] cltexlabel

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

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