How to draw a spectrogram for my earth magnetic data?
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I have a ground-based magnetic data taken every second and i want to plot a spectrogram for my data but i notice that the spectrogram equation on matlab need this parameters [window,noverlap,nfft,Fs] which i don't know. and i notice also that i should do the FFT on my data first before plot its spectrogram.
here is how my data look like, I took about one day and half.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/148084/image.jpeg)
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