Chemical evolution of Gaia-Enceladus. Top panel: time evolution of the chemical enrichment of stars from Gaia-Enceladus. The symbol size changes as a function of stellar age and the points are color-coded according to [Mg/Fe]. Only stars for which an age precision better than ±1.2 Gyr was obtained are shown. The gray line connects median ages computed in equally separated bins of [Fe/H]. The bars correspond to the 25 and 75% quartiles around the medians. The TITANS are distinguished from the GALAH stars by the dark contours. Thick disc stars from Haywood et al. (2018) are shown as gray circles. Bottom panel: [Mg/Fe] vs. [Fe/H] diagram. Circles are color- and size-coded by stellar age. The approximate metallicity value where Fe coming from supernovae type Ia becomes important is indicated at [Fe/H] = −1.5.