Illustration of the different regions used in the analysis of a Faraday cube. The green cylinders represent the region searched for polarization (at Faraday depth |ϕ| < 100 rad m⁻² and outside the central region that is contaminated by instrumental effects). The outer regions (100 rad m⁻² < |ϕ| < 450 rad m⁻²) were used to characterize the noise. The images have a size of 3′ × 3′.