Third brightest cool SG in various galaxies as a function of galaxy metallicity. The data points with the labels HST, JWST, SMC IR, and SMC VIS are from this work. The data points labeled Davies+18 and McDon+22 come from Davies et al. (2018)’s work on the SMC and LMC, and McDonald et al. (2022)’s work on M 31, respectively. We note that I Zw 18 and the SMC have multiple data points that are similar within 0.02 dex. The light blue horizontal lines show the third brightest cool SG in individual simulations. We performed 20 simulations per galaxy, and visualize the number density of simulation outcomes with violin plots. The gray ticks indicate the time-averaged cool SG luminosities of BoOST SMC models with three different initial masses, which are similar across the shown metallicity range.