### Notch filter

`notch -X# [-f# -w# -o` outfile`-l# -x# -c# -V# -h]` file(s)

> `-X` frequency to be cancelled
> `-f` sampling rate of data (1)
> `-w` width of filter (f/100)
> `-l` number of values to be read (all)
> `-x` number of values to be skipped (0)
> `-c` column to be read (1 or file,#)
> `-o` output file name, just `-o` means file`_notch`
> `-V` verbosity level (0 = only fatal errors)
> `-h` show this message

Simple notch filter in the time domain. Output file file`_notch`.

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