Results of the Fourier analysis on the RM data of the different sectors presented in Figure 7. The blue curve represents the FT of the original RM data. The red curve represents the FT of the geometrically modified RM data as described in Section 4.1. Each dashed line shows the exact position of integers divided by 360°. The black dashed line shows 1/360, the red dashed line shows 2/360 and 4/360, and the blue dashed line shows 3/360 and 5/360.