Top: normalized profiles illustrating the results of the de- and reprojection of the simulated β-profile map rebinned using the Voronoi tessellation with 300 counts/bin. Black: profile of the rebinned initial data maps; Red: profile obtained by de- and reprojecting the initial data maps. These profiles correspond to the azimuthal average of the maps on the left and on the right of Fig. 7, respectively. Bottom: relative residuals computed as in Fig. 3.