def METHOD_NAME(self, array):
    utils.assert_quantity_sub_equal(
        array[0::2, 0],
        self.TEST_CLASS._rowclass(
            array.value[0::2, 0], x0=array.x0, dx=array.dx*2,
            name=array.name, unit=array.unit, channel=array.channel,
            epoch=array.epoch,
        ),
    )
    with pytest.raises(
        NotImplementedError,
        match="^cannot slice SpectralVariance across bins$",
    ):
        array[0, ::2]