Chemical evolution of the Splash and Erebus. Top: age–metallicity relation for stars in the Splash (left) and Erebus (right) components. The size of the points change according to stellar age and the color according to the [Mg/Fe] ratio. The Gaia-Enceladus sequence is shown as the red line. For the Splash, only stars with ages that have precision better than ±1.5 Gyr are considered. For Erebus, we plot those with age precision below ±2 Gyr. Thick and thin disc stars from Haywood et al. (2018) are shown as green and black crosses, respectively. Bottom: [Mg/Fe] ratio as a function of metallicity for stars in the Splash (left) and Erebus (right) components. Points are color- and size-coded according to the stellar age.