I have been given the following Nyquist polar plot of an unknown transfer function, along with the fact that this system is openloop stable:
Now I can directly see this is a type 1 system. - So there is a non-zero, limited error when given a constant input. A simple system that shows a similar shape is for example (constants are different of course). $$H_1 = \frac{1}{s+1}\frac{1}{s^2 + s + 1}$$
Now it is asked from me to determine -from the graph- what the steady state error will be, if this system is inputted into a unity feedback loop: $$H_2 = \frac{H_1}{1+H_1}$$