If, for an example, you know that this amplifier circuit is a low pass filter, you can relate the frequency sweep and the cutoff frequency to the magnitude plot and phase plot. You haven't told us what filter this is nor its order so I am forced to give you an example. However, depending on what the shape of the Bode plot, you can find a pattern from the magnitude plot. I believe you're talking about the filter function where you basically perform a frequency sweep. The cutoff frequency only gives you pole behavior of your magnitude plot.
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