def FitCBVs(model):
    """
  Fits the CBV design matrix to the de-trended flux of a given target. This
  is called internally whenever the user accesses the :py:attr:`fcor`
  attribute.
  
  :param model: An instance of the :py:obj:`everest` model for the target
  
  """
    raise NotImplementedError('This mission is not yet supported.')
