Returns a sequence of tuple pairs with the first item being a
        number of Cliffords and the second item being the corresponding average
        ground state probability.

def data(self) -> Sequence[Tuple[int, float]]:
        """Returns a sequence of tuple pairs with the first item being a
        number of Cliffords and the second item being the corresponding average
        ground state probability.
        """
        return [(num, prob) for num, prob in zip(self._num_cfds_seq,
                                                 self._gnd_state_probs)]