Figure 4 shows a Bode plot for the amplitude and phase of a system against frequency, which has been obtained via experiments conducted on an unknown system. Estimate the transfer function given that the damping is much less than 1 but non-zero. Four data points are given in figure 4: the point at 0.1 rad/s has a magnitude of 20.9 dB; the point at 1 rad/s has a magnitude of 0.9 dB; a local peak occurs at approx. 2.95 rad/s and has a peak height of 12dB. Bode Diagram 40 20 -20 -40 -60 -80 -100 -90 -135 -180 -225 -270 10 10 10' Frequency (rad/s) 10 (6ep) seud Magnitude (dB)