Intervening Fe ii absorption towards the quasar Tol 0453−423: spectrum (black curve) and simultaneous fit to the two transitions (red curve), both falling on the quasar Lyα emission line. The bottom black curve in each panel corresponds to the noise level. The upper panel is a zoom of the lower to clearly show the good fit of the observed spectrum as obtained with a spatial coverage factor C_f = 0.98 (green curve). At v_helio = 0 km s^-1, the redshift is z = 0.72604.