ρ
1
.
5
i
n
i
t
i
a
l
v
a
l
u
e
(
u
0
)
0
.
8
n
u
m
b
e
r
o
f
t
e
r
m
s
1
0
g
r
a
p
h
s
o
l
u
t
i
o
n
p
l
o
t
l
i
n
e
u
n
+
1
=
ρ
u
n
(
1
-
u
n
)
e
q
u
i
l
i
b
r
i
u
m
:
u
n
=
0
.
3
3
3
3
3
3