Comparison of M_star (upper panel) and SFR (lower panel) determinations from the different models. The x-axis is from the baseline model (free-age 2-populations), the y-axis corresponds to free-age decl.-τ (green circles), fixed-age rising-τ (blue dots), and two-populations (red diamonds) models. Typical uncertainties on parameter estimations are indicated by a black cross. Δ(SFR) = Δ(log    (SFR_2pop) − log    (SFR_{τ − model})) and Δ(M_star) = Δ(log    (M_star−2pop) − log    (M_{star−rising − τ})).