Comparison of the abundances of HE 0557−4840 with those of the ejecta of the models of Nomoto et al. (2008, their Figure 5) and Joggerst et al. (2010, their Figure 9). In each panel, the open circles refer to the 1D LTE abundances of HE 0557−4840 from Norris et al. (2007) and the present work, while the filled circles are the corresponding 3D LTE values. In the upper and middle panels the connected small symbols correspond to the Nomoto et al. models having 25  M _☉, and explosion energies E ₅₁ = 20 and 1 (in units of 10 ⁵¹ erg), respectively. In the bottom panel, the line corresponds to the Joggerst et al. z15G model (15  M _☉, with Z = 0 initial composition).