Polarization fraction bias, normalized to the true value p0, as a function of the S/N I0/σI, plotted for three values of the polarization S/N, p0/σp,G, and values of the effective ellipticity εeff covering the canonical (full line), low (dark grey shaded region), and extreme (light grey shaded region) regimes of the covariance matrix. The intensity correlation coefficients are set to ρQ = ρU = 0. We only consider the domain where (I0/σI) > (p0/σp,G).
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