<s>
Unlike	O
the	O
uniform	B-Algorithm
theory	I-Algorithm
of	I-Algorithm
diffraction	I-Algorithm
(	O
UTD	O
)	O
,	O
BTM	O
does	O
not	O
make	O
the	O
high	B-Algorithm
frequency	I-Algorithm
assumption	O
(	O
in	O
which	O
edge	O
lengths	O
and	O
distances	O
from	O
source	O
and	O
receiver	O
are	O
much	O
larger	O
than	O
the	O
wavelength	O
)	O
.	O
</s>
