I do not know much about electrical enigeering or physics so perhaps for someone in your field it would be easily understood what "it" refers to. However, as a practice, I generally think it is better to restate the noun in a prepositional phrase, especially when that phrase is in a separate sentence from the noun to which it refers.
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Dario PerezIt is clear that the "it" replaces X?Oof! Not really. It's too far after 'power spectral density'. In any case, I think that's the least of your worries. I would write this differently.
Dario PerezBy your reception, it seems I have to change it, in some form...you maWell, I understood CJ's version, whereas your original one was not clear to me at all.
Dario Perezthe initial "The power spectral density is the Fourier analogue to the WES." basically introduces the power spectral density (PSD) in the letter paper we are finishing. The second phrase introduces the criteria for the sampling rate, and after that we enumerate the arbitrary criteria.Right. The problem, as I saw it, was that there was nothing that
Dario Perezyou have to condense everything of value in three pagesYet another problem. That might be difficult because there is undoubtedly a lot of information there. Good luck.