Comparison of the CB estimation with its true value. The blue region represents the mean ±3 standard deviations of the CBs estimated by the MBB method of KDEs with bandwidth h = BW_1∕3 from 300 different samples, each consisting of n = 10³ solutions of the Fermi map; the true values of the CB are also calculated from the KDEs with bandwidth h = BW_1∕5 (dotted red line) and KDEs with bandwidth h = BW_1∕3 (dotted blueline) from the same 300 samples.