How to draw a spectrogram for my earth magnetic data?

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aliaa madbouly
aliaa madbouly 2015-8-15
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.

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