code: def make_fpfList(options):
      
  
      user_values = options.fpf
  
      defaults = ['0.0001', '0.001', '0.01', '0.05']
  
      if user_values:
          for fpf in user_values:
              if fpf not in defaults:
                  defaults.append(fpf)
  
          defaults.sort()
  
      return defaults
docs: aggregate default fpf values and user-defined fpf values where enrichment factor calculations will be attempted.
      :param options: SplitInput object
      :return defaults: list includes default fpf values & unique user-defined values