How can i plot magnitude spectrums before and after filter?

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Joe Moul
Joe Moul on 13 May 2020
Commented: Star Strider on 14 May 2020
I have cutoff frequency 0.2 Hz. I want to design a pair of lowpass FIR and IIR filters(any filter type is ok).
How can I plot the magnitude spectrums of the signal before filtering and after filtering out the one or two high frequency components.

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