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you need to extend the range of your graphs
you need to know where the gain graph crosses 0 dB, so the scale has to include 0 dB and you need to extend graph to see where it crosses
you need to know when the phase graph crosses -180 degrees, so extend the phase scale to include -180 degrees
you need to extend the frequency range to about 0.1 Hz to get a handle on DC gain
you need to extend the frequency scale to whatever you need so the gain crosses 0dB and the phase gets below -180 degrees