Radial profiles of the RM computed in semi-circular annuli with a width of 8.5′ (i.e. 51 kpc). The points are color-coded according to the direction of the section indicated in the top right corner of each panel. Top left: RM mean radial profile of the N and S sectors. Top right: RM mean radial profile of the NW and SE sectors. Bottom left: RM mean radial profile of the east and west sectors. Bottom right: RM mean radial profile of the NE and SW sectors.