Fits of the exponential infall to the time–[Si/Fe] distribution (ω_MDF, αDF = 0). Top row, from left to right: best-fit time–[Si/Fe] used to fit the data, the time–metallicity distribution, and the abundance–metallicity distribution. In each panel, the points show the data. Second row: MDF, αDF, and the recovered SFH. The grey histograms show the distribution functions for the inner disc in APOGEE. Third row: evolution of the baryonic mass, gas mass and stellar mass over time. Fourth row: infall rate, and the evolution of the SFE and ϵ. The different lines are for different initial conditions, and the dashed lines show the evolution of those unfitted initial states.