Adopted SFHs. The galaxy evolution simulation comparing different IMF assumptions (Sect. 6) adopts the boxy SFH (orange dashed line) with a constant SFR = 10³M_⊙ yr⁻¹ and a t_sf of 1 Gyr. The simulation adopting the log-normal SFH (solid red line) finishes its 50%, 75%, and 90% star formation (in mass fraction) in 0.5, 0.98, and 1.8 Gyr, respectively. A comparison of the galaxy chemical evolution results adopting these two different SFHs are shown in Appendix A.