IGIMF
The evolution of the metallicity
The evolution of the metallicity
Final metallicities converge with different initial metallicities because of the feedback dependence of the IMF shape on the metallicity at the time.
Final metallicities differs with different star formation rate since it influence the shape of the IMF.
The evolution of the metal abundance ratio
The evolution of the metal abundance ratio
The evolution of gas (orange) and mass averaged stellar (blue) phase metal abundance ratio.
The serrated shape is caused by the simplification that all the stars formed in a 10 Myr star formation epoch have an identical age.