Question: How to rescale axis?

Hi all,

 

I have recentry constructed Fourier amplitude and Fouier Power graphs which are plotted against the frequency of the oscillations, like the picture below.

 

I would like to change the frequency scale along the x axis into a period scale in order to Fourier analyse future ODE systems in  terms of period rather than frequency.

But I unsure how to manipulate my code to do so.

 

Any help would be much apreciated, and the Maple file that I am using is attached.

 

Thanks in advance!

 

Fourier_with_Period.mw

 

 

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