Predicted ejection rate of He from stellar populations of different metallicities (different colours) by assuming the stellar yields of Nomoto et al. (2013). The grey shaded area corresponds to our predictions when assuming the Limongi & Chieffi (2018) set of stellar yields of rotating massive stars with different metallicities ([Fe/H] = 0, −1, −2, and −3 dex) and stellar rotational velocities (v_rot = 0, 150, and 300 km s⁻¹). The blue shaded horizontal region corresponds to the chemical enrichment of super-AGB stars which are not included in our galactic chemical evolution model.