import warnings


def stderr(self):
    """DEPRECATED"""
    warnings.warn(
        "The FitVal class has been depreacted and replaced with UFloat "
        "objects, use .std_dev or .s to access the equivalent of the "
        "FitVal.stderr property.",
        DeprecationWarning,
        stacklevel=2,
    )
    # deprecation warning
    return self.std_dev