Hey guys im in an electro-acuostics class...its pretty cool stuff. Im having trouble finding the answer to a question, a crossword puzzle to be percise, and i was wondering if you guys could help.

Heres my clue...

" [It] Derived from a Fourier transform, this shows discrete harmonically related frequency components and their relative amplitudes."

Another clue is...

"Fourier was the mathematician who proved that periodic waves can be broken down into _______"

Thanks guys and i searched through the reading material i have and tried google....so any help you guys can give would be great!

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How many letters is it? Just a guess, but is it harmonics?
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