Sector analysis of RMs in different rings, as described in Section 3.3. Each color represents a different ring. Data points and estimated error bars are shown with the same color in each ring. Solid lines show fourth-order polynomial functions. The first ring starts between 2 kpc and 4 kpc from the center in the plane of the galaxy, and subsequent rings are placed every 2 kpc. The last ring is placed between 14 kpc and 16 kpc where the polarization emission reaches three times the signal-to-noise ratio (S/N) value. Each ring is divided into multiple sectors separated by 10° in azimuthal angle. Sectors start at 0° on the south-eastern major axis of the galaxy on the plane of the sky and increase counter-clockwise. The plot was divided for a better visualization: The left panel shows rings from 2 to 8 kpc and the right panel shows rings from 8 to 16 kpc.