NEFERTITI models using Population II yields from massive stars with two different rotation velocities (Limongi & Chieffi 2018). The dotted lines and shaded areas represent the median and 25 and 75 percentiles of all stars in the model. The full lines represent the same models but only considering stars that formed in environments dominated by internal enrichment (no external enrichment case). The blue and orange colours are for the models using the non-rotating (v = 0 km/s) and fast-rotating yields (v = 300 km/s), respectively. The grey line is the GCE model from Kobayashi et al. (2020).