docs: def datporod(gnomoutfile):
      """Run datporod and return the estimated Porod volume.
  
      Returns:
           Radius of gyration found in the input file
           I0 found in the input file
           Vporod: the estimated Porod volume
      """
      results = subprocess.check_output(['datporod', gnomoutfile]).decode('utf-8').strip().split()
      return float(results[0]), float(results[1]), float(results[2])