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Then try it on an example file that contains a weighted mix of Earth's orbital eccentricity, obliquity and climatic precession.

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Usage:

% ./hpnaff -v
Welcome to hpNAFF Analysis. ©2015-2021 Heiko Pälike. 3rd party licenses: see --licenses option
Please provide exactly one file name argument
Usage: hpnaff [options] file
file format: tab separated columns, data must be equidistantly spaced. Instead of file can specify '-' for stdin.
  -h, --help:
      Displays help message.
  -r, --fracRMSChangeLimit:
      fracRMSChangeLimit. Default: 0.000002
  -f, --fracFreqAccuracyLimit:
      fracFreqAccuracyLimit. Default: 0.00000001
  -m, --maxFrequencies:
      maxFrequencies. Default: 30
  -c, --freqCycleLimit:
      freqCycleLimit. Default: 100
  -l, --lowerFreqLimit:
      lowerFreqLimit. Default: 0.0
  -u, --upperFreqLimit:
      upperFreqLimit. Default: 0.5 (NYQUIST)
  -d, --detrendingOrder:
      Order for polynomial detrending. 0 removes DC only. >0 removes a polynomial fit. Default: not set
  -dC, --detrendChunks:
      Option to apply detrending (-d) to individual chunks. Default: false
  -fAL, --filterAbscissaLower:
      filter on Abscissa (x-axis) data greater or equal than value specified.
  -fAU, --filterAbscissaUpper:
      filter on Abscissa (x-axis) data lesser or equal than value specified.
  -s, --chunkSize:
      Split the input file into chunks of this size. Default: not set, no chunking
  -w, --window_offsets:
      Specify windowing offset for evolutive analysis. Default: chunkSize if set, or None.
  -z, --columnSeparator:
      Use this as columns separtor for input file instead of default tab \t. Default: \t
  -k, --skipHeaderLines:
      Specify number of (header)lines to be skipped. Default: 0
  -n, --decimate:
      Specify decimation of input data. Default: 1 (take every value)
  -a, --abscissaColumn:
      Specify column number for abscissa (time or depth). Default: 1
  -o, --ordinateColumn:
      Specify column number for ordinate (data). Default: 2
  -C, --complex:
      Compute spectra for complex input. Default: false. If true, by default takes values from abscissa column + 1.
  -Co, --ComplexOrdinateColumn:
      Specify column number for ordinate (data), complex part. Default: 3 (if C option used)
  -t, --deltaT:
      Specify time/depth offset between data. Default: 1.0
  -x, --ratios:
      Compute and output frequency ratio matrix. Default: false.
  --ratio_list:
      If ratio_option is set, provides comma separated list of frequency ratios to highlight in output.
  --output_detrended_data:
      Output detrended data to this filename. Not implemented yet.
  --version:
      Shows current version and build of this software
  -v, --verbose:
      Print verbose messages. Specify multiple times to increase verbosity.
  --references:
      Shows references to papers and sources.
  --licenses:
      Shows licenses of code components used in this software.

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