Parameter posteriors obtained from the maximum likelihood estimation performed over the average power spectra from 300 simulations with σ₀ = 0.05. The top and bottom panels show the posteriors before and after correction for leakage, respectively. The three vertical dashed lines are the median value of the posterior and ±1σ errors. The 68% and 95% confidence contours are shown in darker and lighter shades, respectively. The red lines are the true values of the parameters used for simulations.