def wmo_correction(R_raw):
    """Apply WMO calibration factor to raw rain rate

    parameters
    ----------

    R_raw : array like
        Rain rate in mm/h

    return
    ------

    R_calib : pandas.DataFrame
        Corrected rain rate in mm/h

    """

    R_calib = (R_raw / 1.16) ** (1 / 0.92)
    return R_calib