def __repr__(self):
        """ Display some basic printable info, but not everything.
        """
        out = ".values =\n"+self.values.__repr__()
        if self.base_values is not None:
            out += "\n\n.base_values =\n"+self.base_values.__repr__()
        if self.data is not None:
            out += "\n\n.data =\n"+self.data.__repr__()
        return out