code: def read_times(self, filename=None):
          
          aux = nm.array([], dtype=nm.float64)
          return aux.astype(nm.int32), aux, aux
docs: Read true time step data from individual time steps.
  
          Returns
          -------
          steps : array
              The time steps.
          times : array
              The times of the time steps.
          nts : array
              The normalized times of the time steps, in [0, 1].
  
          Notes
          -----
          The default implementation returns empty arrays.