Examples of magnetic field profiles along two 600 Mpc long LOS that start at AGN found in the TNG-100 simulation. Upper panel: LOS starting inside a strong magnetic field bubble at the beginning, corresponding to AGN-3. Lower panel: example of the LOS starting from AGN-2 within a small bubble. We indicate the first bubble with green, other bubbles with red, and voids with blue. See Sect. 3 for details.