Voigt-profile fit of absorption lines observed at epoch IV. The black solid lines show the observed spectrum, with the associated error indicated by the dashed line at the bottom. The red lines show the combined model fit. Other coloured lines show the individual components. The four components, “a”, “b”, “c”, and “d”, are labelled accordingly. The transitions are listed in order of decreasing oscillator strength, for each population. Telluric features are highlighted in yellow.