Model parameter θ₅ = SFR_peak, the epoch of the peak of the star formation rate (SFR), shown here in arbitrary units. As functional form for the SFR, we use the gamma distribution with k = 2 (see Eq. (2)). Variations in the epoch of peak star formation of ± 1,2σ_prior from are shown (see Table 1). The fraction of stars being formed before 3.5 Gyr is written next to the legend labels.