3
D
p
l
o
t
c
o
n
t
o
u
r
p
l
o
t
r
e
a
l
p
a
r
t
i
m
a
g
i
n
a
r
y
p
a
r
t
a
b
s
o
l
u
t
e
v
a
l
u
e
f
u
n
c
t
i
o
n
C
h
i
(
z
)
C
i
(
z
)
S
h
i
(
z
)
S
i
(
z
)
E
i
(
z
)