Integrated path length through the full simulation box (top panels) and through only the observer cells (lower panels). The full box is of 60 kpc on a sideand is integrated from an observer placed at R_⊙ = 8 kpc from thecenter. The observer is immersed in the Tsf galaxy at 8 kpc from the galactic center and his angular coordinate is is ϕ_⊙ = 180° for the left panels and ϕ_⊙ = 60° for the rightpanels.