Automatic Control Systems
Which of the following features is not associated with Nichols chart?

The frequency at intersection of G(j?) locus and M = +3 dB locus gives bandwidth of closed loop system
(0 dB, -180°) point on Nichols chart represent critical Point (-1, 0)
M loci are centred about (0 dB, -180°) point
It is symmetric about -180°

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