code: def run_total_dos(self,
                        sigma=None,
                        freq_min=None,
                        freq_max=None,
                        freq_pitch=None,
                        use_tetrahedron_method=True):
          
          if self._mesh is None:
              msg = "run_mesh has to be done before DOS calculation."
              raise RuntimeError(msg)
  
          total_dos = TotalDos(self._mesh,
                               sigma=sigma,
                               use_tetrahedron_method=use_tetrahedron_method)
          total_dos.set_draw_area(freq_min, freq_max, freq_pitch)
          total_dos.run()
          self._total_dos = total_dos
docs: Calculate total DOS from phonons on sampling mesh.
  
          Parameters
          ----------
          sigma : float, optional
              Smearing width for smearing method. Default is None
          freq_min, freq_max, freq_pitch : float, optional
              Minimum and maximum frequencies in which range DOS is computed
              with the specified interval (freq_pitch).
              Defaults are None and they are automatically determined.
          use_tetrahedron_method : float, optional
              Use tetrahedron method when this is True. When sigma is set,
              smearing method is used.