Contour plot of the ¹⁸²W excess of Earth’s mantle after 200 Myr of evolution, as a function of the impactor mass (M_T) and the time of the giant impact (t_GI). The left plot shows results for complete equilibration between the core of Theia and proto-Earth, while the right plot shows results for 50% equilibration (i.e., 50% of the core of Theia merges directly with Earth’s core). The pebble accretion time-scale has been set to t_pA = 5 Myr in both cases. The є_W = 0 value of Earth is consistent with the pebble accretion model for an impactor mass between 0.3 M_E and 0.5 M_E and a fully equilibrating impact that occurs at least 35 Myr after the formation of the Sun. Lowering the equilibration to 50% requires an impact between two nearly equal-mass bodies to occur after at least 50 Myr. The so-called canonical model, with an impactor of 10% Earth mass (Canup & Asphaug 2001), is excluded in both cases which instead favour an impactor with a similar mass as proto-Earth (Canup 2012). A very low equilibration factor of f_eq = 0.25 yields є_w values larger than 1.5 for all impactor masses; the є_w = 2.0 contour for f_eq = 0.25 is indicated with a black dashed line.