Faraday dispersion spectra of selected lines of sight labelled from 1 to 9 as in Fig. 8. The three dashed black lines point out the position of the histogram peak for the “bubble”, the “ring” and the “curtain” components. For each spectrum the “Clean” line is obtained from the “Raw” one by applying an RMCLEAN session with a threshold of 3 mJy beam^-1. The noise level is shown by 1σ error bars.