def getLimit(self, alpha, upper=True):
        """ Evaluate the limits corresponding to a C.L. of (1-alpha)%.

        Parameters
        ----------
        alpha :  limit confidence level.
        upper :  upper or lower limits.
        """
        dlnl = onesided_cl_to_dlnl(1.0 - alpha)
        return self.getDeltaLogLike(dlnl, upper=upper)