<s>
The	O
Relative	B-Data_Structure
Gain	I-Data_Structure
Array	I-Data_Structure
(	O
RGA	O
)	O
is	O
a	O
classical	O
widely-used	O
method	O
for	O
determining	O
the	O
best	O
input-output	O
pairings	O
for	O
multivariable	O
process	O
control	O
systems	O
.	O
</s>
