Polarisation angle dispersion function in the centre of NGC253. Maps of the polarisation angle dispersion function obtained using the Band 4 (left) and Band 7 (right) data. Only pixels with I/σ_I > 3 in total intensity are shown. Vectors indicating the orientation of the B field vectors are overlaid only in correspondence of pixels where PI/σ_PI > 3. Yellow stars indicate the positions of the SSCs catalogued by Leroy et al. (2018).