Maximum enhancement of the helium mass fraction in SG stars as a function of initial cluster mass. Diamonds represent models without Type Ia SNe from Calura et al. (2019) and Yaghoobi et al. (2022a): filled diamonds represent the high-density models, while empty ones the low-density models. The data for the models with Type Ia SNe with the highest initial cluster masses are taken from Lacchin et al. (2021). Open circles and squares are observational data obtained by Milone et al. (2020) for the Milky Way and Magellanic Clouds clusters (initial masses of each cluster are from Baumgardt & Hilker 2018 and Goudfrooij et al. 2014.)