Data compared to our models and to previous results from the literature. The colour-coding of the models and the data show the [Fe/H] content as explained by the colour bar. In this case, the data are binned so as to show the mean value of [Fe/H] in each bin. The three circles plotted on the models mark the ages 0.3 Gyr, 1 Gyr, and 5 Gyr. The horizontal and diagonal black lines separate three different plane regions as denoted by Fernandes et al. (2023); the unevolved populations lie in the upper left region, the MW high-α in situ population lies in the upper right region; and the MW low-α in situ population lies in the lower region. Left panel: [Mg/Mn] versus [Fe/H] for REF MW model (colour coded black-edge line) and NEW MW model (colour-coded white-edged line) compared to the APOGEE DR17 data of Fernandes et al. (2023) and their best model obtained adopting the prescriptions of Andrews et al. (2017; thin black line). Right panel: [Mg/Mn] versus [Fe/H] for REF MW model (colour-coded black-edge line) and MIX MW model (colour coded grey-edge line) compared to the same data and model by Fernandes et al. (2023).