From Anna: I've added some lines about the backward transforms to the original FFT.C tutorial.
From Anna:
I've added some lines about the backward transforms to the original FFT.C tutorial.


git-svn-id: ecbadac9c76e8cf640a0bca86f6bd796c98521e3@22937 27541ba8-7e3a-0410-8455-c3a389f83636

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