 And do the same thing on FFTMON (U_1) to monitor the FFT component. You may see a spectrum at 2kHz. This FFT is together with "Rectangle
Window".  Next, open the monitor for FFTMON (U_2) to see the other FFT.  Then you may find that has some frequencies other than 2kHz. Those are
6kHz, 10kHz, 14kHz... This FFT is together with "Hanning Window".
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