Stellar mass growth histories of NGC 7793 (solid line), NGC 300 (dashed line), M 33 (dotted line), and NGC 2403 (dash-dotted line) predicted by the respective best-fitting models. Stellar masses are normalised to their present-day values. The horizontal dashed lines mark when the stellar mass reaches 20% (green), 50% (cyan), and 60% (yellow) of its final value, and the vertical dotted red line denotes the galaxy evolutionary age at t = 5.75 Gyr (i.e. z = 1).