Standard deviation distributions of the linear polarization degree, σ_ml, polarization angle, σ_χ, and circular polarization degree, σ_mc, measurements at 4.85 GHz (top row) and 8.35 GHz (lower row). The 20th percentile, P₂₀, of each standard deviation distribution is marked by a dotted line. The circular polarization data contain the measurements corrected with both methods A (solid black line) and B (dashed red line) as described in Sect. 3.7.1.