code: def save_scatter_table(self, fn, description=""):
          
          data = {
             "description": description,
             "time": datetime.now(),
             "psd_scatter": (self.num_points, self.D_max, self._psd_D, 
                  self._S_table, self._Z_table, self._angular_table, 
                  self._m_table, self.geometries),
             "version": tmatrix_aux.VERSION
             }
          pickle.dump(data, file(fn, 'w'), pickle.HIGHEST_PROTOCOL)
docs: Save the scattering lookup tables.
          
          Save the state of the scattering lookup tables to a file.
          This can be loaded later with load_scatter_table.
  
          Other variables will not be saved, but this does not matter because
          the results of the computations are based only on the contents
          of the table.
  
          Args:
             fn: The name of the scattering table file. 
             description (optional): A description of the table.