code: def main():
      
      if "-h" in sys.argv:
          print(main.__doc__)
          return
      infile = pmag.get_named_arg("-f", "measurements.txt")
      dir_path = pmag.get_named_arg("-WD", ".")
      infile = pmag.resolve_file_name(infile, dir_path)
      fmt = pmag.get_named_arg("-fmt", "svg")
      save_plots = False
      interactive = True
      if "-sav" in sys.argv:
          interactive = False
          save_plots = True
      experiments = pmag.get_named_arg("-e", "")
      ipmag.chi_magic(infile, dir_path, experiments, fmt, save_plots, interactive)
docs: NAME
          chi_magic.py
  
      DESCRIPTION
          plots magnetic susceptibility as a function of frequency and temperature and AC field
  
      SYNTAX
          chi_magic.py [command line options]
  
      OPTIONS
          -h prints help message and quits
          -f FILE, specify measurements format file, default "measurements.txt"
          -T IND, specify temperature step to plot -- NOT IMPLEMENTED
          -e EXP, specify experiment name to plot
          -fmt [svg,jpg,png,pdf] set figure format [default is svg]
          -sav save figure and quit