Predicted versus true parameters from Gaussian fittings of the Faraday dispersion. The parameters are amplitude (top left), FWHM (top right) RM (bottom left) and intrinsic polarization angle (bottom right). Predicted values are shown as black dots. The range is divided into 20 bins from which the median ±25% are calculated and shown as red dots and errorbars respectively. A reference line where the predicted value equals the true value is shown as a dashed blue line. Predictions of the polarization angle with an error larger than π/2 radians are adjusted by ±π to account for the π-periodicity of the signal.