def METHOD_NAME(self, fname=None, calib_cf=[0, 1, 0]):
    """Set the energy calibration. Give a filename or a list of calibration factors.
    Kwargs:
        fname (str): optional filename with the calibration factors
        calib_cf (list): optional list of calibration factors
    Returns:
        list. Calibration factors.
    Raises:
        IOError, ValueError
    """
    pass