def detrend_none(x, axis=None):
    """
    Return x: no detrending.

    Parameters
    ----------
    x : any object
        An object containing the data

    axis : int
        This parameter is ignored.
        It is included for compatibility with detrend_mean

    See Also
    --------
    detrend_mean : Another detrend algorithm.
    detrend_linear : Another detrend algorithm.
    detrend : A wrapper around all the detrend algorithms.
    """
    return x