The white dashed line corresponds to the north/south line in equatorial coordinates (﹩\theta =0^\circ ﹩) while the green one represents the best angle of division (﹩\theta =110^\circ ﹩). The green circle corresponds to the best-fit disk model provided by pointlike in Table 1 and the cyan quadrants represent the two regions defined in H. E. S. S. Collaboration et al. (2016) that are studied in Section 3.2.