Evolution of SFR, gas fraction, SNII and SNIa rates, and total gas metallicity. Different lines correspond to the best chemical evolution models obtained with different sets of yields, as indicated. Vertical bars at an age of 13 Gyr show their present-day estimated values. In the bottom-right panel the solid triangle at the age of 8.4 Gyr marks the protosolar metallicity, Z_protoSUN = 0.017, resulting from the PARSEC calibration. The parameters of the chemical evolution models are listed in Table 3.