Hi, Signal analysis from an accelerometer

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I have got data from an accelerometer in an excel sheet (.csv), I imported it in matlab and I would like to go in frequency with fourrier analysis. Like that I could choose which filter I will use to have clean data. I have 7000 points (N = 7000;, I guess), the frequency is 200 Hz (so Fe : 200; and Te = 1/Fe;) after that I don't know how to process.
If someone could help me, it would be great!
Thank you :)

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