Consider a step change of 1.0 (from 1.5 to 2.5 
in jacket flowrate. The responses of the linear and nonlinear
models are shown in Figure 3. The linear response is qualitatively
the same as the nonlinear response, but the magnitude of change
is different. The gain (change in output/change in input) of
the linear model is greater than the gain of the nonlinear model.
