Example field configurations (in each panel the left side shows a B field angle representation and the right side shows tangential curves) for all three models used in the fitting procedure: par model: Eq. (3) (left panel), wegde model: Eq. (5) (middle panel), and const model: Eq. (7) (right panel). To guide the eye, we indicate the extent of a hypothetical galactic disc with an diameter of 30 kpc as purple ellipse outlined by a black dashed line. Additionally, we highlight the areas that are masked in our data processing with teal, hatched rectangles. All models are point-symmetric with regard to the galaxy centre. In all three cases, we only display the normalised field orientation in the x − z plane, as would be traced by radio polarimetry data.