Probability density functions, f2D(p,ψ | p0,ψ0,Σp), plotted for various values of ψ0 (rows), spanning from − π/ 8 to 3π/ 8, and computed for four configurations of the covariance matrix (columns), parameterized by ε and ρ. The S/N on the intensity I is assumed to be infinite here. A true value of polarization p0 = 0.1 has been chosen, and with S/N p0/σp,G = 1. White crosses indicate the mean likelihood estimates of the PDF (). The contour levels are provided at 0.1, 1, 5, 10, 20, 50, 70, and 90% of the maximum of the distribution.
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