Probability of finding the true polarization angle ψ₀ inside the interval , where and are the lower and upper uncertainties for each estimator, ML/MAP (blue) and MB (pink), and plotted as a function of the S/N p₀/σ_p,G. For each value of the S/N 1000 Monte-Carlo simulations have been carried out in the low regime of the covariance matrix. The expected level at 68% is shown as a dashed line.