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Figure 3 s The transfer function G, (s), G,,(s), G,,(s) and G,,(s) are obtained by conducting step test. By keeping constant inflow rate to the tank, the steady state responses of open loop systems are obtained. From the open loop responses of two interacting conical tank system, the transfer func- tions are obtained as follows. Relative gain Array (RGA) matrix is computed for the transfer function is given by