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Build array is not your friend here In fact I'd replace the build arrary and the Power Spectum Express Vis with "FFT Power Spectrum and PSD.vi" Search the pallete or use Quick drop to locate it.
Why did you pull y from the filtered waveform just to rebuild the same waveform ? Wire the waveform to the second FFT Power Spectrum and PSD .vi directlyImage may be NSFW.
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