Chemical abundance ratios of Gaia-Enceladus and in situ stars in GALAH DR3. Typical uncertainties are shown as black symbols at the bottom. The gray shaded region indicates the metallicity range where the fraction of stars with Eu detection becomes small. The small blue and red triangles are respectively high-Mg and low-Mg populations from NS10, for which abundances are taken from NS10, NS11, and Fishlock et al. (2017).