Several typical examples of the Faraday spectrum in Faraday depth space F(φ). Top: Gaussian magnetic field distribution for four different models (see Table 2): solid green line (model 1); dashed black line (model 2); dashed red line (model 3); dot-dashed blue line (model 4). Bottom: the case of magnetic field reversals and model 1): one reversal (dot-dashed blue line); two reversals (dashed red line).