<s>
Vertically	B-Algorithm
integrated	I-Algorithm
liquid	I-Algorithm
(	O
VIL	O
)	O
is	O
an	O
estimate	O
of	O
the	O
total	O
mass	O
of	O
precipitation	O
in	O
the	O
clouds	O
.	O
</s>
<s>
The	O
measurement	O
is	O
obtained	O
by	O
observing	O
the	O
reflectivity	O
of	O
the	O
air	O
which	O
is	O
obtained	O
with	O
weather	B-Application
radar	I-Application
.	O
</s>
<s>
According	O
to	O
the	O
wavelengths	O
used	O
in	O
weather	B-Application
radars	I-Application
,	O
only	O
precipitation	O
can	O
be	O
noted	O
(	O
drizzle	O
,	O
rain	O
,	O
snow	O
,	O
hail	O
)	O
,	O
not	O
the	O
cloud	O
droplets	O
nor	O
water	O
vapor	O
,	O
so	O
Z	O
is	O
proportional	O
to	O
the	O
rain	O
rate	O
.	O
</s>
