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The method
We have separated r and E, from direction variables and turned integration to
summation for direction in the scatter source
)(
)
(
)ˆ
(
)ˆ
(
ˆ
P pq
)2('
) (
)
(
)
(
)ˆ
(
1
1 4
, ,
,
, ,
,
dE mY
l
E
E E
E
pr r
p
scat q
ErE t
ErE
)3(
)ˆ ˆ( )ˆ ˆ(
1
)ˆ ˆ
(
2/1 )
(
0 0
,
,
,
,
,
, ,
d
P
E E
E E
l
l
l m
rml
rls
r scat
q
)4(
'
)ˆ(
)ˆ, ,(
) ,(
1
,
,
,
,
d m
lY Er
Erml
l
rs
rls
Let us continue with E
4
,
…