X-ray luminosity per unit SFR of Be-XRBs in the SR_CS model with f_corr = 0.5, in the energy bands E ∼ 0.1–2 (solid), 0.5–2 (dashed), 2–10 (dash-dotted), and 0.5–8 keV (dotted). For comparison, we plot the best-fitting models from BPS results for other types of HMXBs in Fragos et al. (2013b, F13) with the thick curves following the same line styles for the latter three bands. Here for the 0.5–2 and 2–10 keV bands, we use the fitting formulae and parameters in their eq. 3 and table 2, while the results for the 0.5 − 8 keV band are taken from Lehmer et al. (2021, see their fig. 4). The observational results for the 0.5–8 keV band from Lehmer et al. (2021, L21, see their fig. 4 and table 3) are shown with the shaded region. The thin vertical lines label the metallicities of the MW, LMC and SMC (from right to left).