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The FREQ argument specifies the input sampling frequency; the center frequencies are given in the same units. -h Print on-line help. -i Perform inverse FFT; in this case, the standard input should be in the form generated by `fft -c', and the standard output is a series of samples. -I Perform inverse FFT as above, but using input generated by `fft -p'. -l LEN Perform up to LEN-point transforms. `fft' rounds n up to the next higher power of two unless LEN is already a power of two. If the input series contains fewer than LEN samples, it is padded with zeros up to the next higher power of two. Any additional input samples beyond the first LEN are not read. Default: LEN = 16384. -n NN Process the input in overlapping chunks of N samples and output an averaged spectrum. If used in combination with -P, the output is the average of the individual squared magnitudes; otherwise, the output is derived from the averages of the real components and of the imaginary components taken separately. 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