Left panel: recovered RM vs. injected RM for 5000 simulated compact components before applying the median filter. The red dashed line is the one-to-one line. The extreme outliers are components that are fainter than the local foreground diffuse emission. The inset is a close-up of ϕ ± 20 rad m⁻². Right panel: same as the left panel but after applying the median filter. There is an 80% reduction in the most extreme outliers and an overall increase in the accuracy of the recovered RMs of all components.