Magnetic field orientation in the centre of NGC253. Upper panels: Maps and corresponding vectors of the magnetic field orientation, obtained rotating the observed polarisation angle by 90 degrees. The vectors indicate the magnetic field orientation and are displayed only at pixels where PI/σ_PI > 3. Centre panels: S/N maps of the B field orientation with contours corresponding to [1, 3, 5, 10]×PA/σ_PA. White stars in the lower left panel indicate the positions of the SSCs catalogued by Leroy et al. 2018. Both maps have been obtained selecting pixels with total intensity above 3 sigma. Bottom panels: Histograms of the B field orientation pixel values in each map. Results from Band 4 and Band 7 observations are shown in the top row and the bottom row, respectively. The plot annotations and pixel selection criteria are the same as in Figure 2.