Recently we have received a revision of one manuscript. One reviewer request an explanation of the units of the y-axis of the spectrum density (calculated through fft matlab algorithm). As we are not physics or mathematic we have troubles to perform an appropriate response.(adsbygoogle = window.adsbygoogle || []).push({});

The units that we give in our manuscript are mm2 (the time series units is mm).

We add the matlab algorithm and our matlab text lines.

[Frd,Crd]=size(RD);

nfft=2^nextpow2(Frd);

fftrd2=fft(RD,nfft); fftrd=fftrd2(1:nfft/2,:); fftrd=abs(fftrd)

were RD is the time serie.

I grateful if anyone guide me about it

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# Units FFT

Can you offer guidance or do you also need help?

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