Kolmogórov-Smirnov estimator distribution comparison between models. zELDA’s prediction using the IGM+z, IGM-z and NoIGM models are displayed in blue, green and yellow, respectively. Each subpanel show the KS distribution at different observed line profile qualities. In particular, in the left panel S/N_p = 15.0 and W_g = 0.25 Å, in the middle panel S/N_p = 10.0 and W_g = 0.5 Å, in the right panel S/N_p = 7.0 and W_g = 1.0 Å. The vertical dashed lines mark the median of the KS distribution of the matching color.