Intervening Fe ii absorption towards the quasar TXS 1331+170: spectrum (black curve) and simultaneous fit to the six transitions (red curve). The lower three panels correspond to Fe ii lines of smaller oscillator strength and have a different f_nm scale. The Fe iiλ1608 absorptions are redshifted on top of the quasar Lyα emission, and there are weak Lyα absorptions not included in the fit. At v_helio = 0 km s^-1, the redshift is z = 1.328522.