code: def get_waveset(model):
      
      if not isinstance(model, Model):
          raise SynphotError('{0} is not a model.'.format(model))
  
      if isinstance(model, _CompoundModel):
          waveset = model._tree.evaluate(WAVESET_OPERATORS, getter=None)
      else:
          waveset = _get_sampleset(model)
  
      return waveset
docs: Get optimal wavelengths for sampling a given model.
  
      Parameters
      ----------
      model : `~astropy.modeling.Model`
          Model.
  
      Returns
      -------
      waveset : array-like or `None`
          Optimal wavelengths. `None` if undefined.
  
      Raises
      ------
      synphot.exceptions.SynphotError
          Invalid model.