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frequencies of fft plot window are incorrect

Question asked by minidick on Mar 6, 2012
Latest reply on Mar 20, 2012 by JohnJiang

version 5.0 update 9.1


For fft plot, frequencies and amplitude are calculated and displayed.

The frequency increament should equal to FS/N, but it equals to FS/(N+2) in the plot,   N = 2^k

Is this a bug of plot window?