.. versionadded:: 1.20.0

            The "backward", "forward" values were added.

    Returns
    -------
    out : ndarray
        The result of the real 2-D FFT.

    See Also
    --------
    rfftn : Compute the N-dimensional discrete Fourier Transform for real
            input.

    Notes
    -----
    This is really just `rfftn` with different default behavior.
    For more details see `rfftn`.

    )