The Nichols diagram for Gc(jω)G(jω) of a closed loop system

The Nichols diagram for Gc(jω)G(jω) of a closed loop system is shown in Figure P9.22.The frequency for each point on the graph is given in the following table:
The Nichols diagram for Gc(jω)G(jω) of a closed loop system

Determine (a) the resonant frequency, (b) the bandwidth,
(c) The phase margin, and (d) the gain margin.
(e) Estimate the overshoot and settling time (with a 2% criterion) of the response to a step input.

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