Effective star formation history of the sample, in units of yr⁻¹ (left y-axis) and M_⊙ yr⁻¹ (first right y-axis). The second right y-axis corresponds to the total SFR obtained by multiplying by the ratio f = SFR_5 − 11/SFR_tot (see Sect. 5). Vertical bars correspond to errors on the parameters. Ages below 5 Myr are not included in our analysis, and thus the corresponding area in the plot is hatched.