Posterior probability density functions B2D(p0,ψ0 | p,ψ,Σp) computed for the most probable measurements (p, ψ) of the f2D distribution (crosses), which were obtained for a given set of true polarization parameters ψ0 = 0° and p0 = 0.10 (dashed lines) and various configurations of the covariance matrix, at four levels of S/N p0/σp,G = 0.1,0.5,1, and 5 (top to bottom). The scales of the p0 and ψ0 axes may vary from one row to the next in order to focus on the interesting part of the PDF. The black contours provide the 90, 70, 50, 20, 10, 5, 1, and 0.1% levels.
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