Difference between the optical V-band dust attenuation recovered in the SED modelling and in the simulation as a function of the difference of mass-weighted age of the stellar population recovered in the SED modelling and in the simulations. Dotted lines indicate agreement between these ages and attenuations. All points are colour-coded by the ratio of the recovered and simulated stellar mass (colour bar). The strong correlations observed for the tau models indicate that these fits are affected by the degeneracy between stellar age and dust reddening. Overall, this plot reinforces the conclusion that discrepancies between the true and recovered ages are the primary cause of inaccurate mass recovery.