docs: def get_data_files():
      """
      Returns the path of data files, which are installed to the package directory.
      """
      import os
  
      path = os.path.dirname(__file__)
      path = os.path.join(path, 'data')
      r = dict(
          Alpha_inf_hyrec_file = os.path.join(path, 'hyrec', 'Alpha_inf.dat'),
          R_inf_hyrec_file = os.path.join(path, 'hyrec', 'R_inf.dat'),
          two_photon_tables_hyrec_file = os.path.join(path, 'hyrec', 'two_photon_tables.dat'),
          sBBN_file = os.path.join(path, 'bbn', 'sBBN.dat'),
      )
      return r