Same as Fig. 6, but comparing different SFHs instead of different IMF assumptions. The orange lines apply the boxy SFH and the red lines apply the log-normal SFH, both shown in Fig. 2. The same colour-coding is applied from Figs. A.2–A.7. The serrated shape is caused by the dying stars with a lifetime shorter than 10 Myr (see Sect. 6.2). We note that the orange lines are the same as the orange lines in Fig. 6.