p
a
r
e
n
t
ξ
=
0
N
o
r
m
a
l
D
i
s
t
r
i
b
u
t
i
o
n
[
0
,
1
]
ξ
>
0
S
t
u
d
e
n
t
T
D
i
s
t
r
i
b
u
t
i
o
n
[
1
,
2
,
4
]
ξ
<
0
M
i
n
S
t
a
b
l
e
D
i
s
t
r
i
b
u
t
i
o
n
[
1
,
1
,
0
.
5
]
t
r
i
a
l
#
5
0
0