Scatter plots comparing the escape fractions for the three outputs in the 1728 directions of observation to the properties of the C II absorption line on the left and the Lyβ line on the right. The seven colored dots show the position of the spectra displayed in Sect. 3. EW_abs is the EW of the absorption line (negative EW_abs means more emission than absorption), EW_fluo is the EW of the fluorescent emission, v_max is the velocity of the deepest point in the spectrum, v_cen is the velocity at which the absorption line has half its EW, and v₉₀ is the velocity where the blue side of the absorption line reaches 90% of the continuum value. The orange vertical lines show the median value of the x-axis variable over the 5184 directions. There is no fluorescent channel for Lyβ, and so one panel is missing.