Comparison between the measured chemical abundance pattern, [X/Fe], of the star AS0039 (red) in LTE (squares) and NLTE (stars) with model predictions (lines) for the pure descendants of a Pop III 20 M_⊙ star with fixed mixing f_mix = 0.063. Different colours denote different SN explosion energies for Pop III stars: 0.3 × 10⁵¹ erg (blue), 1.2 × 10⁵¹ erg (green), 5 × 10⁵¹ erg (yellow), and 10 × 10⁵¹ erg (orange).