Central Faraday depth, ϕ_c, position of the single component from QU-fitting (see Fig. 10 brown markers. We note that here we use the one-component fit for all boxes) versus peak position, ϕ_max in the RM-synthesis spectra. The color indicates the Faraday depth width of the QU-fitting component. Evidently, QU-fitting and RM-synthesis gives similar results in case of a low Faraday dispersion. Larger differences between QU-fitting and RM-synthesis correspond to higher Faraday dispersions.