Density plot of the distribution of simulated long-living stars predicted by our models (see the bar below the figure for the colour scale). Left panel: results of [Eu/Fe] vs [Fe/H] for model NSt3 contained in Cavallo et al. (2021). The long-living stars formed without Eu (formally [Eu/Fe] = −∞) are shown at [Eu/Fe] = −1.5 dex. The model predictions are compared to the halo stars contained in JINAbase (see Sect. 2.1) plotted with blue dots; we show as open dots the five CEMP stars discussed in Sect. 2.1. Right panel: same as left panel but for model MSFR. This model contains the modified SFRs assumed in our scenario. Note that we do not include the effects of dilution and quenching time of SF.